All Tools | CalculationTime

Solar-system instrumentThe Grand OrreryPlanetary positions, alignments, eclipse context and poster-quality astronomical charts in the current staged mechanics instrument.Reference-frame instrumentThe Spiral Grand OrreryShows how planetary ellipses become forward-moving helical paths when the Sun movement through the galaxy is included.Southern sky clockThe Crux PerpetualThe Southern Cross clock-calendar: Crux as the hand, the South Celestial Pole as the pivot, and Earth as the movement.Lunar calendarMoon Phase CalendarDaily lunar illumination, new and full moon events, and hemisphere-aware phase context for planning by the Moon.

Percentages & Everyday MathPercentage CalculatorCalculate a percentage of a number, what percent one value is of another, and percentage change in one clear worksheet with a printable calculation record.Percentage & MathFraction CalculatorAdd, subtract, multiply or divide two fractions, reduce the answer to simplest form, show the mixed number and decimal check, and print a classroom or measurement worksheet record.MathPercentage Change CalculatorFind the percentage increase or decrease between an original value and a new value, with baseline sensitivity, visual proof and a printable comparison record.Math & StatisticsPercent Error CalculatorCalculate percent error between an experimental or measured value and an accepted reference value, with absolute and signed error shown clearly.Percentage & MathAverage CalculatorCalculate the arithmetic mean of up to five values, with the formula, total, count, outlier check and a printable classroom or report worksheet.MathRatio CalculatorSimplify two-number ratios, scale them to a new total, and show part-to-part and part-to-whole percentages with a printable worksheet record.Math & StatisticsRandom Number Generator CalculatorGenerate a reproducible pseudo-random number between two limits, with optional integer mode, seed, draw count and range-size proof.Math & MeasurementArea CalculatorCalculate rectangular area from length and width, with measured area, planning allowance, unit-basis notes and a printable quote, classroom or job record.Measurement & ConstructionVolume CalculatorCalculate the volume of a rectangular box, room, container or prism from length, width and height, with litres, cubic metres and cubic feet shown for checking.Math & GeometryPythagorean Theorem CalculatorFind the hypotenuse of a right triangle from two legs, with square-sum proof, optional check length and a printable classroom or layout record.Math & StatisticsSlope CalculatorCalculate the slope between two coordinate points, show the rise-over-run formula, flag vertical lines and print a clean classroom or drawing worksheet.Math & StatisticsStandard Deviation CalculatorCalculate mean, population standard deviation and sample standard deviation for a small data set, with the squared-difference method visible.FinanceMortgage CalculatorEstimate a US-style monthly mortgage payment with principal and interest, property tax, home insurance, PMI and HOA shown separately for a clearer house-buying budget.Finance & MoneyLoan CalculatorCalculate an estimated fixed loan payment from amount, APR, term and optional upfront/down-payment adjustments, with total interest, payoff total, scenario comparison and a printable loan quote record.MoneyAuto Loan CalculatorEstimate a car loan payment from vehicle price, down payment, trade-in, sales tax, fees, interest rate and loan term.FinanceSimple Interest CalculatorCalculate simple interest, total repayment and effective yearly interest from principal, rate and time.MoneyCompound Interest CalculatorProject compound growth from a starting balance, regular contributions, interest rate, compounding frequency and time horizon.MoneyPresent Value CalculatorDiscount a future amount back to today using an annual rate, time horizon and compounding frequency.FinanceFuture Value CalculatorProject what a starting amount and regular deposits could be worth in the future using an annual rate and compounding frequency.FinanceROI CalculatorCalculate return on investment from amount invested, final value, extra costs and optional time held, with a printable investment comparison record.FinanceDebt Payoff CalculatorEstimate how long it will take to pay off a debt from balance, APR and monthly payment, with optional extra payment and fee fields kept visible.Finance & Household BudgetingDebt-to-Income Ratio CalculatorCalculate front-end and back-end debt-to-income ratios from monthly income, housing cost and recurring debt payments for mortgage, rental, refinance and budget-prep records.Finance & Household BudgetingBudget CalculatorBuild a monthly budget from income, housing, bills, debt, savings and everyday spending, with surplus/shortfall, savings-rate and printable household budget worksheet outputs.Time, Work & PayrollSalary CalculatorConvert annual salary into monthly, biweekly, weekly, daily and hourly gross equivalents, with paid-week and weekly-hour assumptions, unpaid-hours comparison and a printable job-offer or pay-review worksheet.Work & PayrollCommission CalculatorCalculate sales commission from sale amount, commission rate, base pay and returns or chargebacks.Math & PercentagesDiscount CalculatorCalculate sale price, discount amount and optional tax from an original price and discount percentage, with a printable sale-tag, coupon or quote check.Finance & Everyday MoneySales Tax CalculatorCalculate sales tax, discount, shipping and final checkout total from a subtotal and tax rate, with the tax amount kept separate for receipts, quotes and classroom examples.Finance & AustraliaGST CalculatorAdd or remove Australian 10% GST from a price and show the exclusive amount, GST component and inclusive total.Finance & Household BudgetingInflation CalculatorEstimate how inflation changes purchasing power, future cost and real value over time from an amount, annual inflation rate and number of years, with a printable budget or classroom record.Finance & MoneyLease Amortization CalculatorEstimate a lease liability, right-of-use asset basis and first-period amortization from fixed payments, discount rate, term, payments already made and initial direct costs.HealthBMI Calculator - Adult Body Mass Index, Healthy Weight Range & BMI PrimeCalculate adult BMI from metric or US units, see the BMI category, healthy weight range, BMI Prime, Ponderal Index and clear health limitations.Health & FitnessBody Fat Percentage CalculatorEstimate body fat percentage from circumference measurements using the U.S. Navy method for adults.Health & FitnessBMR CalculatorEstimate basal metabolic rate using Mifflin-St Jeor or revised Harris-Benedict, with activity-adjusted daily context.Health & FitnessCalorie Deficit / TDEE CalculatorEstimate BMR, total daily energy expenditure and a calorie target for weight maintenance, loss or gain.Health & FitnessMacro CalculatorSplit a daily calorie target into protein, fat and carbohydrate grams using body weight and selected macro percentages.Health & FitnessIdeal Body Weight CalculatorEstimate ideal body weight using Devine and Hamwi-style adult formulas, with BMI-range cross-checks.Time, Distance & FitnessPace CalculatorCalculate pace per mile and per kilometre from distance and finish time for running, walking, cycling, race planning and printable training records.Health & FitnessMax HR / Target Heart Rate Zones CalculatorEstimate maximum heart rate and target training zones using age, resting heart rate and intensity bands.Health & LifecyclePregnancy Due Date CalculatorEstimate due date, gestational age and trimester from last menstrual period, conception, IVF transfer or ultrasound dating.Time & DateAge CalculatorCalculate age from a birth date to a chosen date, with years, months and days shown clearly.Time & DateTime Duration CalculatorCalculate the hours and minutes between two times, including overnight spans.Work & PayrollBusiness Days CalculatorCount weekday business days between two dates, with optional start-date and end-date inclusion controls.Time & DateWeek Number CalculatorFind the ISO week number, ISO week-year and weekday for a calendar date, with a simple year-boundary explanation.Measurement & Unit ConversionAcres to Hectares CalculatorConvert acres to hectares for land, farm, property and site-area records, with square-metre and square-foot cross-checks.ConversionsAcres to Square Feet CalculatorConvert acres to square feet, square yards and square metres, with an optional allowance for land, landscaping and quote notes.MoneyAmortization CalculatorBuild a fixed-rate loan amortization check with monthly payment, balance after a chosen payment, interest paid and extra-payment impact.Finance BasicsAPY CalculatorCalculate annual percentage yield from a stated interest rate and compounding frequency, with ending balance, earned interest and a printable savings comparison record.Home, Trade & ConstructionAsphalt CalculatorEstimate asphalt tonnage from paving length, width and compacted depth, with cubic yards, short tons, metric tonnes, waste allowance, cost estimate and a printable paving quote note.Work & PayrollBillable Hours CalculatorEstimate weekly, monthly and annual billable capacity after non-billable work, leave weeks and utilisation limits, with a printable capacity and revenue record.Developer & Number BasesBinary / Hex Converter CalculatorConvert a whole decimal number into binary, hexadecimal and octal notation with bit-length and byte-count checks.Work, Payroll & TimeBiweekly Pay CalculatorCalculate gross biweekly pay from hourly rate, regular hours, overtime hours and optional pretax deductions, with clear pay-period assumptions and a printable payroll worksheet.Trade & ConstructionBoard Foot CalculatorCalculate board feet for lumber from thickness, width, length, quantity and waste allowance, with cubic-foot cross-checks, optional material cost and a printable lumber order worksheet.BusinessBreak-Even CalculatorFind the sales volume and revenue needed to cover fixed costs, variable costs and optional target profit.ConstructionBrick CalculatorEstimate brick count for a rectangular wall from wall size, brick face size, mortar joint allowance, openings and waste.FinanceBudget Split CalculatorSplit monthly income into needs, wants, savings and debt payments, then print a simple budget record.Finance & BusinessCAGR CalculatorCalculate compound annual growth rate from a starting value, ending value and time period, with growth-multiple, annualised return, scenario comparison and a printable investment or business-growth record.Home, Trade & ConstructionCarpet CalculatorEstimate carpet area, waste allowance, roll length and optional material cost from room measurements and carpet roll width.Finance BasicsCD CalculatorCalculate certificate of deposit growth from opening deposit, APY and term length, with ending balance, interest earned, early-withdrawal note and a printable bank-offer comparison record.Unit & MeasurementCelsius to Fahrenheit CalculatorConvert Celsius temperatures to Fahrenheit, with Kelvin and an optional tolerance line for classroom, kitchen, weather and lab notes.Measurement & Unit ConversionCelsius to Kelvin CalculatorConvert degrees Celsius to kelvin with the exact 273.15 offset, absolute-zero guardrails and a printable classroom, science or lab worksheet record.ConversionsCentimetres to Feet and Inches CalculatorConvert centimetres to feet and inches for height records, product dimensions, cut notes and classroom worksheets.Measurement & Unit ConversionCentimetres to Feet CalculatorConvert centimetres to decimal feet and feet-and-inches with exact inch-based arithmetic, optional allowance and a printable height, measurement or cut-list record.ConversionsCentimetres to Inches CalculatorConvert centimetres to inches, feet and inches, with the exact 2.54 cm per inch relationship shown clearly.Measurement ConversionCentimetres to Metres CalculatorConvert centimetres to metres, millimetres and feet, with an optional planning allowance kept separate for worksheets, measuring records, quote notes and cut lists.Measurement & Unit ConversionCentimetres to Millimetres CalculatorConvert centimetres to millimetres, metres and inches with an optional tolerance kept separate for drawings, product dimensions, school worksheets and quote notes.Parenting & AustraliaChildcare Subsidy (CCS) CalculatorEstimate weekly Australian Child Care Subsidy and out-of-pocket childcare cost from income, activity hours, fee and days.Math & MeasurementCircle Area CalculatorCalculate the area and circumference of a circle from radius or diameter, with unit-aware results and a printable measurement record.Math & MeasurementCircumference CalculatorCalculate the distance around a circle from radius or diameter, with area, allowance and a printable measurement record.Measurement & Unit ConversionCM to Inches CalculatorConvert centimetres to inches for height records, product dimensions, craft cuts, classroom worksheets and quote notes, with exact 2.54 cm-per-inch arithmetic and a printable measurement record.Money EducationCompound Growth CalculatorProject repeated percentage growth from a starting value and turn the full compounding path into a visible period-by-period story.Health & BodyConception Date CalculatorEstimate conception date and fertile-window timing from due date, last menstrual period or ultrasound gestational age, with clear medical limitations.Construction & TradeConcrete Bags CalculatorEstimate ready-mix concrete bags from slab length, width, depth, bag yield and waste allowance, with cubic metres, litres and bag count kept visible for quote notes and job records.Home, Trade & ConstructionConcrete Block CalculatorEstimate concrete blocks for a wall from wall length and height, with block size, openings, waste allowance, mortar-joint basis, cost estimate and a printable block takeoff record.Home, Trade & ConstructionConcrete CalculatorEstimate concrete volume for a rectangular pour from length, width and thickness, with cubic yards, cubic metres, bag estimates, ready-mix cost, visible overage and a printable pour-planning record.Home, Trade & ConstructionConcrete Footing CalculatorEstimate concrete for strip footings, wall footings and post footings from length, width and depth, with cubic yards, cubic metres, bag checks, waste allowance and a printable footing pour note.Home, Trade & ConstructionConcrete Slab CalculatorCalculate concrete slab volume from length, width and thickness, with cubic yards, cubic metres, bag estimates, waste allowance, optional cost and a printable pour record.TradesConcrete Volume CalculatorEstimate concrete volume for slabs, footings and rectangular pours from length, width, depth and waste allowance.Trade & ConstructionContractor Markup & Margin CalculatorConvert cost, markup and margin into a contractor selling price and gross profit.Time & DateCountdown CalculatorBuild a simple printable countdown to an event date and time using days, hours, minutes and seconds.Trade & ConstructionCountertop Square Footage CalculatorCalculate countertop square footage from length and depth, add backsplash area, subtract cutouts, apply waste allowance and print a quote-ready measurement record.Unit ConversionCubic Feet to Cubic Metres CalculatorConvert cubic feet to cubic metres with exact volume conversion, optional allowance and a printable volume record for shipping, storage, trades and classroom work.Measurement & Unit ConversionCubic Feet to Cubic Yards CalculatorConvert cubic feet to cubic yards for concrete, mulch, gravel, soil, shipping or classroom volume notes, with allowance, cubic-metre cross-checks and a printable job record.Unit ConversionCubic Metres to Cubic Feet CalculatorConvert cubic metres to cubic feet, with optional ordering allowance for shipping, storage and trade quantity notes.Trade & ConstructionCubic Yards CalculatorCalculate cubic yards from length, width and depth in feet and inches, with measured cubic feet, cubic metres, ordering allowance, rounded order quantity and a printable concrete, gravel, soil, mulch or classroom job note.Measurement & ConversionCups to Fluid Ounces CalculatorConvert cups to US fluid ounces, millilitres and litres with the cup-size basis and printable recipe or batching record kept visible.Measurement & Unit ConversionCups to Grams CalculatorConvert cups to grams using an entered grams-per-cup density for flour, sugar, butter, oats, powders and recipe worksheets, with tablespoon, millilitre, serving and printable kitchen record outputs.Measurement & ConversionCups to Litres CalculatorConvert cups to litres, millilitres and fluid ounces with US cup and metric cup differences shown clearly for recipes, batching and classroom records.Measurement & Unit ConversionCups to Millilitres CalculatorConvert cups to millilitres for recipes, classroom worksheets and kitchen records, with a visible cup-size basis so US, legal, imperial and metric cups are not confused.Unit & Measurement ConversionCups to Quarts CalculatorConvert US cups to quarts using the 4-cups-per-quart liquid-volume basis, with pint, gallon, fluid-ounce, millilitre, batch and planning-allowance checks plus a printable recipe, catering or classroom measurement record.Measurement & Unit ConversionCups to Tablespoons CalculatorConvert cups to tablespoons using the US customary cooking basis, with millilitre cross-checks, scaling notes and a printable recipe or classroom worksheet record.Measurement & GeometryCylinder Volume CalculatorCalculate cylinder volume from radius or diameter and height, with litres, cubic metres, cubic feet and optional allowance shown for tanks, tubes, posts and classroom work.Time & DateDate CalculatorAdd or subtract calendar days from a start date using clear Gregorian calendar arithmetic.Time & DateDate Difference CalculatorCount elapsed calendar days between two dates, then see weeks-and-days, inclusive-count warnings, UTC-midnight methodology and a printable date-span record.Time & DateDay of the Week CalculatorFind the weekday for any calendar date using year, month and day inputs, with Gregorian calendar assumptions, historical-date cautions and a printable weekday record.Time & DateDays Between Dates CalculatorCalculate elapsed days between two calendar dates, with inclusive-date options, weeks-and-days breakdown and a printable date-span record.Time and DateDays to Hours CalculatorConvert days to hours for schedules, payroll prep, travel planning, project timelines and classroom worksheets, with minute/second cross-checks, repeat counts and a printable duration record.Time and DateDays to Minutes CalculatorConvert days to minutes using 1 day = 1,440 minutes, with extra hours and minutes, repeat counts, second/hour cross-checks, optional hourly value and a printable duration, schedule or classroom record.Time and DateDays to Weeks CalculatorConvert days to weeks by dividing by 7, with extra hours, repeated periods, rounding, whole-week breakdowns and a printable schedule, classroom or project-duration record.Time & DateDecimal Hours to Hours and Minutes CalculatorConvert decimal hours such as 7.75 or 1.5 into hours, minutes and seconds for timesheets, payroll notes, invoices and study logs.Percentages & MathDecimal to Fraction CalculatorConvert a decimal into a simplified fraction with denominator control, percentage cross-check, optional quantity multiplier and a printable classroom, recipe or measurement worksheet record.Percentage & MathDecimal to Percentage CalculatorConvert a decimal multiplier into a percentage, per-hundred statement and optional base-value check for worksheets, spreadsheets, rates and report notes.Trade & ConstructionDeck Board CalculatorEstimate deck board count, running metres, waste allowance and optional material cost from deck size, board width, spacing and board length.Science & Everyday MathDensity CalculatorCalculate density from mass and volume, with g/mL, g/cm³, kg/m³ and lb/ft³ cross-checks, uncertainty range, unit-basis notes and a printable lab, material or classroom density record.Business & AccountingDepreciation CalculatorCalculate straight-line depreciation, annual expense, accumulated depreciation and book value after a selected year.Freight & LogisticsDimensional Weight CalculatorCalculate freight chargeable weight from parcel dimensions, actual weight and carrier divisor.Time, Distance & FitnessDistance CalculatorCalculate distance from average speed and elapsed time, with mile, kilometre, metre, pace and printable trip or classroom record outputs.Work & PayrollDouble Time CalculatorCalculate double-time pay from regular hours, double-time hours, base hourly rate and optional extra gross pay, with a printable payroll record.Money EducationDrawdown Recovery CalculatorCalculate the percentage gain and number of growth periods needed to recover from a drawdown.Trade & ConstructionDrywall CalculatorEstimate plasterboard or drywall sheets from wall length, height, openings, sheet size and waste allowance.HR & BusinessEmployee True Cost (Oncost) CalculatorEstimate total employee cost from salary, superannuation, payroll tax, leave loading and workers compensation.HR & Business · AustraliaEmployee True Cost (Oncost) Calculator — AustraliaCalculate the total annual cost of employing someone in Australia including superannuation, leave loading, workers compensation and payroll tax. Shows total oncost percentage above salary.Trade Compliance & CarbonEU CBAM Calculator - Carbon Border Adjustment Cost & Embedded EmissionsEstimate EU CBAM certificate cost for imports of steel, cement, aluminium, fertilisers, hydrogen and electricity. Calculate embedded emissions, carbon price exposure and per-unit CBAM cost.AutomotiveEV vs Petrol Running Cost CalculatorCompare annual petrol and electric vehicle energy costs and estimate payback on an EV price premium.Events & HospitalityEvent Catering Quantity CalculatorEstimate food and drink quantities for an event from guest count, meal format and event duration.Time & DateEvent Duration CalculatorCalculate gross and net duration for an event, appointment, class, meeting or shift.Home, Trade & ConstructionExcavation CalculatorEstimate excavation volume from length, width and depth, with cubic yards, cubic metres, loose spoil, truckload checks, cost estimate and a printable dig or quote note.ConversionsFahrenheit to Celsius CalculatorConvert Fahrenheit temperature readings to Celsius and Kelvin, with a separate tolerance field for weather, classroom, kitchen and HVAC records.ConversionsFeet and Inches to Centimetres CalculatorConvert feet and inches directly into centimetres, metres and total inches with the exact international-inch basis and a printable height or measurement record.Measurement & Unit ConversionFeet and Inches to Decimal Feet CalculatorConvert feet and inches to decimal feet for cut lists, room measurements, estimating sheets and classroom work, with metric cross-checks and a printable measurement record.ConversionsFeet and Inches to Metres and Centimetres CalculatorConvert height, product dimensions or building measurements from feet and inches into metres and centimetres using the exact international inch definition and a printable measurement record.ConversionsFeet to Centimetres CalculatorConvert decimal feet into centimetres, metres and inches using the exact international-foot definition.Unit & MeasurementFeet to Inches CalculatorConvert feet to inches, yards and centimetres with an optional inch allowance for measurements, cut lists and classroom records.ConversionsFeet to Metres CalculatorConvert decimal feet into metres, centimetres and inches using the exact international-foot definition.Measurement & Unit ConversionFeet to Miles CalculatorConvert feet to miles using the exact 5,280 feet per international mile basis, with yards, metres, optional allowance and a printable distance record.Measurement & UnitsFeet to Yards CalculatorConvert feet to yards for fabric, sports fields, landscaping, fencing, rope, classroom work and quote notes, with optional allowance kept separate from the exact conversion.Construction & TradeFence CalculatorEstimate fence panels, posts, total run length and material-only cost from a straight or rectangular fence layout.Study & SchoolFinal Grade CalculatorFind the score needed on a final exam or project to reach a target course grade under clear weighted-grade assumptions.TradesFlooring Area CalculatorAdd rectangular room sections, include a clear waste allowance and print a flooring measurement record for quotes, classrooms and job notes.Measurement & ConversionFluid Ounces to Cups CalculatorConvert US fluid ounces to cups, millilitres and litres with the cup-size basis, formula and printable recipe or batching record kept visible.Measurement & Unit ConversionFluid Ounces to Millilitres CalculatorConvert US fluid ounces to millilitres, litres, cups and imperial fluid ounces for recipes, labels, refills, classroom worksheets and quote notes, with allowance, rounding and a printable volume record.Percentages & MathFraction to Decimal CalculatorConvert a fraction to a decimal with exact division, percentage cross-check, repeating-decimal warning, rounding control and a printable classroom worksheet record.Legal & US FederalFRCP Rule 6 Deadline CalculatorCount a US federal civil procedure deadline from a triggering date with business-day or calendar-day handling.BusinessFreelance Rate CalculatorWork backwards from target income, expenses, taxes, unpaid time and billable hours to estimate a sustainable freelance hourly rate.BusinessFreelancer Hourly Rate CalculatorCalculate a recommended freelance hourly rate from target income, billable weeks, hours, overhead and profit buffer.Finance & EverydayFuel Cost CalculatorEstimate trip fuel cost from distance, fuel economy, fuel price and optional tolls or parking, with litres and gallons shown clearly.Measurement & Unit ConversionGallons to Cups CalculatorConvert US gallons to US cups, quarts, pints, fluid ounces and litres for recipes, drink batches, cleaning mixes, classroom worksheets and quote notes, with allowance, rounding and a printable measurement record.Unit & Measurement ConversionGallons to Fluid Ounces CalculatorConvert US liquid gallons to US fluid ounces using the 128-fluid-ounces-per-gallon basis, with quart, pint, cup, litre, batch, rounding and printable recipe, dispenser, cleaning-mix or classroom measurement records.Measurement & Unit ConversionGallons to Litres CalculatorConvert US gallons and imperial gallons to litres for fuel, pools, recipes, product labels and worksheets, with allowance, container checks and a printable volume record.Percentage, Math & Everyday ArithmeticGCF CalculatorFind the greatest common factor of two or three whole numbers, with Euclidean-algorithm steps, factor-list checks, LCM relationship, classroom wording and a printable arithmetic worksheet record.Math & StatisticsGPA CalculatorCalculate a weighted grade point average from course grade points and credit hours, with the credit-weighted method shown clearly.Study & SchoolGrade Percentage CalculatorTurn points earned and points possible into a percentage score, with an example letter band and clear extra-credit notes.Measurement & Unit ConversionGrams to Cups CalculatorConvert grams to cups using an entered grams-per-cup density for flour, sugar, butter, oats, powders and classroom worksheets, with tablespoon/teaspoon cross-checks, recipe scaling and a printable kitchen measurement record.Measurement & Unit ConversionGrams to Kilograms CalculatorConvert grams to kilograms with exact SI decimal scaling, optional allowance, package count and a printable mass record for recipes, parcels, stock notes and classroom worksheets.Unit ConversionGrams to Ounces CalculatorConvert grams to ounces with exact avoirdupois ounce basis, optional allowance and a printable measurement record for kitchens, parcels, products and classrooms.Unit & Measurement ConversionGrams to Pounds CalculatorConvert grams to pounds using the exact international avoirdupois basis, with ounces, kilograms, pounds-and-ounces, item-count and allowance checks plus a printable kitchen, parcel, lab or classroom weight record.Trade & ConstructionGravel CalculatorEstimate gravel volume and approximate weight from area, depth, waste allowance and bulk density, with a printable landscaping or driveway quote note.BusinessGross Margin CalculatorCalculate gross margin from revenue and cost of goods sold, with gross profit, cost ratio, markup cross-check, scenario rows and a printable margin record.Work & PayrollGross Pay CalculatorCalculate hourly gross pay from regular hours, overtime hours, hourly rate, overtime multiplier and any one-time bonus before deductions, with regular pay, overtime pay, effective rate and a printable payroll arithmetic record.Home & EnergyHeat Pump ROI CalculatorEstimate heat pump payback by comparing current annual heating cost with heat pump running cost and installed cost.Education & AustraliaHECS / HELP Repayment CalculatorEstimate compulsory Australian HECS/HELP repayment from repayment income using 2024-25 threshold bands.Education · AustraliaHECS HELP Repayment Calculator 2024-25Estimate your compulsory HECS-HELP repayment for 2024-25 using current ATO income thresholds and repayment rates. Shows annual, fortnightly and weekly repayment amounts.Measurement ConversionsHectares to Acres CalculatorConvert hectares to acres, square metres and square feet with a visible land-area formula and printable property record.Measurement & Unit ConversionHeight Converter CalculatorConvert height between centimetres, metres, inches and feet-and-inches for medical forms, sports profiles, school worksheets and measurement records, with rounding notes and a printable height report.Work & PayrollHourly Paycheck CalculatorEstimate an hourly paycheck from regular hours, overtime hours, hourly rate, pre-tax deductions and estimated withholding, with gross pay, taxable pay, take-home estimate and a printable paycheck worksheet.Work & PayrollHourly Rate CalculatorConvert annual salary or project fees into transparent hourly rates using entered work hours.Work & PayrollHourly to Salary CalculatorConvert hourly pay into weekly, monthly and annual gross salary equivalents using visible hours and paid-week assumptions.Time, Work & PayrollHours Between Times CalculatorCalculate hours between two clock times, including overnight spans, unpaid breaks, decimal-hour output, rounded hours, gross-value notes and a printable shift, appointment, classroom or job-time record.Time & Duration ConversionHours to Days CalculatorConvert hours into days, hours, minutes and seconds for schedules, timesheets, project plans, equipment logs and classroom worksheets, with repeat counts, rounding and a printable duration record.Time & DateHours to Decimal CalculatorConvert hours, minutes and seconds into decimal hours for timesheets, payroll checks and project logs.Time, Work & PayHours to Decimal Hours CalculatorConvert hours and minutes to decimal hours for payroll, timesheets, invoicing, classroom worksheets and job records, with rounding, pay estimate and a printable time-conversion report.Time & DateHours to Minutes CalculatorConvert hours into minutes, seconds and clock-style duration with the formula, time-unit basis and printable duration record kept visible.Time & WorkHours to Seconds CalculatorConvert hours to seconds using the exact 1 hour = 3,600 seconds relationship, with extra minutes, repeat counts, decimal-day cross-checks, optional hourly value and a printable timer, work log, classroom or media-duration record.ConversionsImperial Gallons to Litres CalculatorConvert UK imperial gallons to litres, with optional allowance kept separate for tanks, fuel logs, brewing, garden and classroom records.ConversionsInches to Centimetres CalculatorConvert inches into centimetres and metres using the exact international inch definition.Measurement ConversionInches to Feet CalculatorConvert inches to decimal feet and mixed feet-and-inches for measurements, cut lists, height records and classroom worksheets.Measurement ConversionInches to Metres CalculatorConvert inches to metres, centimetres and millimetres with an optional metric tolerance kept separate for drawings, product dimensions, quote notes and classroom worksheets.Measurement ConversionInches to Millimetres CalculatorConvert inches to millimetres, centimetres and metres with an optional tolerance kept separate for drawings, parts, product dimensions, classroom worksheets and quote notes.Measurement & Unit ConversionInches to Yards CalculatorConvert inches into yards, feet, centimetres and metres for fabric, rope, landscaping, sports-field marks, cut lists and classroom worksheets, with allowance, rounding and a printable measurement record.Home, Trade & ConstructionInsulation CalculatorEstimate insulation area, batt or roll count and material cost from wall, ceiling or floor measurements, with opening deductions, waste allowance, coverage per pack and a printable homeowner, tradie or classroom job note.Finance & Capital MarketsIPO Lock-up Expiry CalculatorCalculate the expiry date of an IPO lock-up period and show common 90, 180 and 270 day windows.Measurement & Unit ConversionKelvin to Celsius CalculatorConvert kelvin to degrees Celsius with the exact 273.15 offset, optional measurement uncertainty and a printable science or lab worksheet record.Measurement & Unit ConversionKilograms to Grams CalculatorConvert kilograms to grams with exact SI arithmetic, optional allowance, package counts and a printable measurement record for recipes, parcels, stock notes and classrooms.Unit ConversionKilograms to Pounds CalculatorConvert kilograms to pounds with an optional packing or tolerance allowance kept separate from the measured weight.Unit ConversionKilograms to Stone CalculatorConvert kilograms into stone and pounds for UK-style body-weight notes, fitness records, shipping checks and classroom worksheets.Unit & Measurement ConversionKilometres to Metres CalculatorConvert kilometres to metres using the exact metric relationship 1 km = 1,000 m, with centimetre, millimetre, mile and foot cross-checks, optional route allowance and a printable route, survey, classroom or job-note measurement record.ConversionsKilometres to Miles CalculatorConvert kilometres to miles, metres and feet using the exact international-mile basis, with optional route or measurement allowance kept separate.Measurement ConversionsKM/H to MPH CalculatorConvert kilometres per hour to miles per hour with the exact international-mile basis, metres-per-second support and a printable speed conversion record.Percentage, Math & Everyday ArithmeticLeast Common Multiple CalculatorFind the least common multiple of two or three whole numbers, with prime-factor notes, common-multiple checks, classroom wording and a printable arithmetic worksheet record.ConstructionLinear Feet CalculatorCalculate total linear feet from repeated lengths, optional extra runs, waste allowance and unit price for trim, boards, fencing, cable or edging.Measurement & ConversionLitres to Cups CalculatorConvert litres to US customary cups, US legal cups and metric cups with the formula, cup-size basis and printable recipe or batching record kept visible.Measurement & ConversionLitres to Fluid Ounces CalculatorConvert litres to US fluid ounces and imperial fluid ounces with the formula, comparison and printable conversion record kept visible.Measurement & Unit ConversionLitres to Gallons CalculatorConvert litres to US gallons and imperial gallons with visible volume factors, optional allowance, container counts and a printable fuel, recipe, pool or job record.ConversionsLitres to Imperial Gallons CalculatorConvert litres to UK imperial gallons, with optional allowance kept separate for fuel, garden, tank, brewing, classroom and trade records.Measurement & ConversionLitres to Millilitres CalculatorConvert litres to millilitres with the exact decimal SI relationship, optional batching allowance and a printable kitchen, lab, classroom or job-volume record.Measurement & ConversionLitres to Pints CalculatorConvert litres to US liquid pints and imperial pints with the formula, system difference and printable volume record kept visible.Measurement & ConversionLitres to Quarts CalculatorConvert litres to US liquid quarts, imperial quarts, US pints and millilitres with the formula, system difference and printable volume record kept visible.ConversionsLitres to US Gallons CalculatorConvert litres to US liquid gallons, with optional allowance kept separate for fuel, aquarium, brewing, cleaning, garden and trade records.MoneyLoan Payment CalculatorEstimate the monthly payment, total repayment and interest cost for a fixed-rate amortising loan.Finance & BusinessMargin CalculatorCalculate gross margin, gross profit, markup percentage and target-price checks from selling price, cost, quantity and optional discount, with a printable pricing record.BusinessMargin Markup CalculatorConvert cost, markup and profit margin into selling price, gross profit and the difference between markup and margin.Finance & BusinessMarkup CalculatorCalculate selling price, markup amount, markup percentage and gross margin from cost, target markup and optional quantity, with a printable pricing note.Percentage & MathMean Median Mode CalculatorCalculate the mean, median, mode and range for a small data set, with visible ordering, frequency checks and a printable classroom or data-review worksheet.Math & PercentagesMedian CalculatorFind the middle value of a small number set, with the sorted order, count and even-number averaging rule kept visible.BusinessMeeting Cost CalculatorEstimate the labour cost of a meeting from attendee count, average hourly cost, meeting length and preparation time.Measurement & ConversionMeters to Feet and Inches CalculatorConvert meters into feet and inches, decimal feet, total inches and centimeters with the exact meter-to-inch basis and printable height or measurement record visible.Measurement & Unit ConversionMeters to Feet CalculatorConvert meters to feet, inches, feet-and-inches and centimetres for height checks, plans, classroom work and quote notes, with rounding, allowance and a printable measurement record.ConversionsMetres and Centimetres to Feet and Inches CalculatorConvert metric lengths from metres and centimetres into feet and inches using the exact international inch definition.Measurement ConversionMetres to Centimetres CalculatorConvert metres to centimetres, millimetres and feet, with an optional planning allowance for measurement records, classroom work, trades and quote notes.ConversionsMetres to Feet CalculatorConvert metres into feet, inches and centimetres using the exact international foot and inch relationship.Measurement ConversionMetres to Inches CalculatorConvert metres to inches, feet and centimetres with an optional allowance kept separate for height records, product dimensions, cut lists and classroom worksheets.Measurement & Unit ConversionMetres to Miles CalculatorConvert metres to miles for running routes, walking distances, maps, delivery notes and classroom worksheets, with kilometre, feet and yard cross-checks, allowance handling and a printable distance record.Measurement ConversionMetres to Yards CalculatorConvert metres to yards, feet and inches with an optional planning allowance for fabric, turf, sport, classroom and job-note records.Measurement & Unit ConversionMiles to Feet CalculatorConvert miles to feet using the exact 5,280 feet per mile basis, with yards, metres, optional route allowance and a printable distance record.ConversionsMiles to Kilometres CalculatorConvert miles to kilometres, metres and feet using the exact international-mile basis, with optional route or planning allowance kept separate.Measurement & Unit ConversionMiles to Yards CalculatorConvert miles into yards, feet, inches, metres and kilometres for races, route notes, property distances, sports fields, delivery planning and classroom worksheets, with allowance, rounding and a printable distance record.Time & WorkMilitary Time CalculatorConvert regular 12-hour clock time to military time and 24-hour time, with minutes, decimal-hour cross-checks, shift-note context and a printable time-conversion record.Measurement & Unit ConversionMillilitres to Cups CalculatorConvert millilitres to cups for recipes, kitchen prep and classroom worksheets, with the cup-size basis visible so US customary and metric cups are not mixed.Unit & Measurement ConversionMillilitres to Fluid Ounces CalculatorConvert millilitres to US fluid ounces using the NIST liquid-volume basis, with litres, cups, teaspoons, repeated containers, practical rounding and a printable recipe, bottle, classroom or dispensing record.Measurement & Unit ConversionMillimetres to Centimetres CalculatorConvert millimetres to centimetres, metres and inches with an optional tolerance kept separate for drawings, parts, product dimensions and classroom worksheets.Measurement ConversionMillimetres to Inches CalculatorConvert millimetres to decimal inches and feet-and-inches, with optional tolerance kept separate for drawings, parts, products and classroom records.Time & WorkMinutes to Days CalculatorConvert minutes to fixed 24-hour days using minutes ÷ 1,440, with extra hours, repeat-count handling, hour/week/second cross-checks, rounding and a printable schedule, timesheet, machine-runtime or classroom duration record.Time & DateMinutes to Decimal Hours CalculatorConvert minutes into decimal hours for timesheets, billing, payroll prep and classroom checks, with rounding kept separate from the raw answer.Time & DateMinutes to Hours CalculatorConvert minutes into decimal hours and hours-and-minutes for timesheets, study logs, travel durations and billing checks.Time & Duration ConversionMinutes to Seconds CalculatorConvert minutes to seconds with the formula, exact time-unit basis and a printable duration record for classes, workouts, production logs and experiments.Math & PercentagesMode CalculatorFind the most repeated value in a small data set, with the frequency count and no-mode case shown clearly.Time and DateMonths Between Dates CalculatorCalculate full calendar months and remaining days between two dates, with total-day cross-checks, inclusive-date options and a printable planning record.FinanceMortgage Payment CalculatorEstimate a monthly principal-and-interest mortgage payment from loan amount, interest rate and term, with optional tax and insurance fields.Travel, Fuel & Unit ConversionMPG CalculatorCalculate miles per gallon, gallons used, fuel cost and emissions-style fuel notes from distance, fuel volume and price for road trips, fleet logs, reimbursement records and classroom worksheets, with a printable mileage report.Measurement ConversionsMPH to KM/H CalculatorConvert miles per hour to kilometres per hour with the exact speed factor, common road-speed checks and a printable conversion record.Trade & ConstructionMulch CalculatorEstimate mulch volume from bed length, width, depth, allowance and bag size, with cubic metres, litres and bag counts shown together.Medical / HealthcareNurse Staffing Ratio CalculatorEstimate nurses required per shift and per day from patient count, staffing ratio and daily shift count.Unit & Measurement ConversionOunces to Grams CalculatorConvert avoirdupois ounces to grams with exact weight-ounce basis, optional item counts, planning allowance and a printable record for recipes, parcels, products and classrooms.Measurement & Unit ConversionOunces to Pounds CalculatorConvert ounces to pounds with exact avoirdupois arithmetic, optional package count and a printable weight record for shipping, recipes, classroom work and trade notes.Work & PayrollOvertime CalculatorSplit one shift into regular time and overtime, deduct unpaid breaks, and estimate gross pay from a base rate and overtime multiplier.Health & LifecycleOvulation / Fertility CalculatorEstimate ovulation date, fertile window and next period from last menstrual period, cycle length and luteal phase.Trade & ConstructionPaint CalculatorEstimate wall paint litres, cans and material cost from room length, width, height, openings, coats, coverage rate and waste allowance, with a printable job note.Trade & ConstructionPaint Coverage CalculatorEstimate paint quantity from wall length, wall height, openings, coats, coverage rate and waste allowance, with a printable room-painting record.Freight & LogisticsPallet Space OptimiserEstimate pallet count from truck or container dimensions, pallet size and cargo height.Developer & ITPassword GeneratorGenerate a deterministic password-strength estimate from length and character sets, with entropy bits, search-space size and safety notes for using a real password manager.Construction & TradePaver CalculatorEstimate paving stones from area, paver size, waste allowance and optional per-paver price, with the formula and ordering assumptions shown clearly.Work & PayrollPay Raise CalculatorCalculate a pay raise from current salary or hourly pay, with new pay, annual difference, percentage increase and optional bonus comparison.Finance & MoneyPayment / Interest Equivalent CalculatorCompare the same loan across payment, rate and term scenarios to see what monthly payment, total interest and equivalent APR imply.Work & PayrollPayroll Time Card CalculatorEnter start and finish times across the work week, subtract unpaid breaks, split regular and overtime hours, and estimate gross pay for planning.Money EducationPenny Doubling CalculatorTurn the classic penny-doubling puzzle into a visible exponential-growth story with milestones, final jump and complete period timeline.MathPercent CalculatorCalculate what percent a part is of a whole, with visible arithmetic, denominator safeguards and a printable percentage record for worksheets, reports and quote checks.Math & PercentagesPercent Off CalculatorCalculate the sale price, amount saved and optional tax total when a percentage is taken off an original price.Math & StatisticsPercent Yield CalculatorCalculate chemistry percent yield from actual yield and theoretical yield, with mass basis, loss amount, signed difference, formula, caveats and a printable lab worksheet record.Percentage & MathPercentage Decrease CalculatorCalculate percentage decrease from an original value to a lower new value, with the decrease amount, remaining percent, formula and printable comparison record kept visible.Percentage & MathPercentage Difference CalculatorCalculate the symmetric percentage difference between two peer values, with the average-base formula, visible assumptions, worked example and a printable quote, lab, classroom or comparison report.Percentage & MathPercentage Increase CalculatorCalculate percentage increase from an original value to a new value, with the increase amount, multiplier, formula and printable comparison record kept visible.MathPercentage of a Number CalculatorCalculate a percentage of any number, with the amount, remaining value and printable working shown clearly.MathPercentage Point CalculatorCalculate the percentage-point change between two percentages and compare it with ordinary percent change.Percentage & MathPercentage to Decimal CalculatorConvert a percentage into a decimal multiplier, fraction-style per-hundred value and rounded report line for worksheets, discounts, rates and spreadsheet checks.Math & MeasurementPerimeter CalculatorCalculate the perimeter of a rectangle from length and width, with optional allowance for edging, trim, fencing, borders or classroom worksheets.Unit & Measurement ConversionPints to Cups CalculatorConvert US liquid pints to cups using the exact 1 pint = 2 cups relationship, with quart, gallon, fluid-ounce and litre cross-checks, allowance handling and a printable recipe, batch or classroom measurement record.Home & ConstructionPool Volume CalculatorEstimate swimming pool volume from length, width, average depth and shape, with litres and US gallons shown for treatment, heating and maintenance notes.Unit & Measurement ConversionPounds to Grams CalculatorConvert pounds and ounces to grams using the exact international avoirdupois pound, with kilogram and ounce cross-checks, allowance handling and a printable kitchen, parcel, lab or classroom weight record.Unit ConversionPounds to Kilograms CalculatorConvert pounds to kilograms with an optional tolerance or packing allowance kept separate from the measured weight.Measurement & Unit ConversionPounds to Ounces CalculatorConvert pounds to ounces for kitchen scales, parcel weights, classroom unit work and quote notes, with optional allowance, gram cross-checks and a printable weight record.Unit ConversionPounds to Stone CalculatorConvert pounds into stone and pounds with exact 14-pound stone arithmetic, kilogram cross-checks, optional rounding and a printable body-weight, classroom or fitness record.Percentage & MathProbability CalculatorCalculate probability from favourable outcomes and total outcomes, then show odds, complement probability, repeated-trial chance and a printable classroom or risk-note record.BusinessProfit Margin CalculatorCalculate gross profit, profit margin percentage and markup from cost and selling price, with discounts and extra costs kept visible.Work & PayrollProrated Salary CalculatorCalculate prorated gross salary for a partial year, pay period or contract using annual salary, paid days and optional unpaid leave.Measurement & Unit ConversionQuarts to Cups CalculatorConvert US quarts to US cups, pints, gallons, fluid ounces and litres for recipes, drink batches, cleaning mixes, classroom worksheets and job notes, with allowance, rounding and a printable measurement record.Unit & Measurement ConversionQuarts to Gallons CalculatorConvert US liquid quarts to gallons using the 4-quarts-per-gallon basis, with pint, cup, fluid-ounce, litre, batch, allowance, rounding and printable recipe, dispenser, cleaning-mix or classroom measurement records.TradesQuote Profit CalculatorCheck quoted job revenue against materials, labour, overhead, contingency and tax before sending a price.MathRange CalculatorFind the range of up to six numbers, with the minimum, maximum and difference shown for classroom, score and measurement checks.Construction & TradeRebar CalculatorEstimate rebar pieces, total bar length and material cost for a rectangular slab or pad using spacing, edge cover, lap allowance and a printable job note.Home, Trade & ConstructionRectangle Area CalculatorCalculate rectangle area from length and width, with square feet, square metres, optional waste allowance, cost estimate and a printable measurement record.FinanceRefinance CalculatorCompare an existing loan with a refinance offer using payment, monthly saving, closing costs and break-even month.Finance & MoneyRefinance RadarCompare your current loan with a refinance offer to see monthly saving, upfront switching costs, break-even month and estimated interest saved.Real Estate & AustraliaRental Yield CalculatorCalculate gross and net rental yield from property value, weekly rent and annual holding costs.Trade & ConstructionRoofing CalculatorCalculate roof area, pitch-adjusted slope factor, waste allowance and rounded roofing packs for a printable homeowner, supplier or tradie quote note.Percentage & MathRounding CalculatorRound a number to decimal places or a chosen increment, with nearest, up and down modes, formula notes and a printable rounding-rule record.Work & PayrollSalary to Hourly CalculatorConvert annual salary into an hourly rate, weekly pay and monthly pay using visible work-hour assumptions.ConstructionSand CalculatorEstimate sand volume, cubic yards, tons and optional material cost from area, depth, waste allowance and bulk density.FinanceSavings Goal CalculatorCalculate the monthly saving needed to reach a future goal, with current savings, interest and timeframe shown separately.MathScientific Notation CalculatorConvert a number into scientific notation, standard decimal form and order-of-magnitude wording with the formula and rounding basis visible.Time & DateSeconds to Hours CalculatorConvert seconds to hours, minutes and seconds with decimal-hour, decimal-minute, payroll-log and printable worksheet outputs.Time & DurationSeconds to Minutes CalculatorConvert seconds to minutes with minutes-and-seconds breakdown, decimal-minute output, rounding checks, optional repeat count and a printable timer, workout, classroom or production record.Home, Trade & ConstructionSod CalculatorEstimate sod or turf rolls from lawn length, width and coverage, with square feet, square yards, square metres, waste allowance, roll count, pallet check, cost estimate and a printable lawn job note.Home & EnergySolar Panel Payback CalculatorEstimate solar payback from system size, upfront cost, electricity tariff, feed-in tariff and household usage.Time, Distance & FitnessSpeed CalculatorCalculate speed from distance and time, with miles per hour, kilometres per hour, metres per second and pace kept visible for travel, sport, classroom and job records.ConversionsSquare Feet to Acres CalculatorConvert square feet to acres, square yards and square metres, with a clear planning allowance for property, landscaping and classroom records.Unit ConversionSquare Feet to Square Metres CalculatorConvert square feet to square metres with exact area conversion, optional waste allowance and a printable measurement record for quotes, classrooms and property notes.Measurement & ConversionSquare Feet to Square Yards CalculatorConvert square feet to square yards, square metres and optional ordering area with the 1 square yard = 9 square feet formula shown clearly.TradesSquare Footage CalculatorCalculate square feet, square yards and square metres from length and width, with a practical waste allowance for flooring, decking, sheet goods and room measurements.Unit & Measurement ConversionSquare Inches to Square Feet CalculatorConvert square inches into square feet, square metres and optional planning area for drawings, tile pieces, product dimensions and classroom worksheets.Measurement & Unit ConversionSquare Meters to Square Feet CalculatorConvert square meters to square feet, square yards and practical ordering area with a visible allowance, exact formula and printable property, floor-plan, quote or classroom record.Unit ConversionSquare Metres to Square Feet CalculatorConvert square metres to square feet with exact area conversion, optional waste allowance and a printable record for property, trade and classroom use.Percentage & MathSquare Root CalculatorFind the principal square root of a number, its square check and an optional rounded classroom or worksheet result.Measurement & ConversionSquare Yards to Square Feet CalculatorConvert square yards to square feet, square metres and optional ordering area with the 1 square yard = 9 square feet formula shown clearly.Trade & ConstructionStair CalculatorEstimate stair risers, tread going, total run and a 2R+G comfort check from floor height and preferred riser height.Real Estate & AustraliaStamp Duty Calculator - All StatesEstimate Australian residential stamp duty for selected states and buyer types using visible sliding-scale rules.Real Estate · AustraliaStamp Duty Calculator — All Australian StatesCalculate stamp duty for property purchases in NSW, VIC, QLD, WA and SA with first home buyer concessions and effective rate. Shows total purchase cost including duty.Unit ConversionStone to Kilograms CalculatorConvert stone and pounds into kilograms using the exact international pound definition, with an optional allowance kept separate for records and worksheets.Unit ConversionStone to Pounds CalculatorConvert stone and extra pounds into total pounds, kilograms and rounded planning weights for fitness logs, health forms, shipping notes and classroom worksheets.Finance & EducationStudent Loan Repayment CalculatorEstimate student loan monthly repayment, total interest and payoff timing from balance, annual rate, term and extra payment.Developer & ITSubnet CalculatorCalculate IPv4 network address, broadcast address, usable host range, wildcard mask and host count from an IP address and CIDR prefix.Math & MeasurementSurface Area CalculatorCalculate rectangular-prism surface area from length, width and height, with optional planning allowance for wrapping, coating, packaging and classroom geometry records.Measurement & Unit ConversionTablespoons to Cups CalculatorConvert tablespoons to US cups, teaspoons, fluid ounces and millilitres for recipes, batching, meal prep and classroom worksheets, with scaling, rounding and a printable kitchen measurement record.Unit & Measurement ConversionTablespoons to Teaspoons CalculatorConvert US tablespoons to teaspoons using the exact 1 tablespoon = 3 teaspoons relationship, with cup, fluid-ounce and millilitre cross-checks, recipe scaling, practical rounding and a printable recipe or classroom spoon-measure record.Measurement & Unit ConversionTeaspoons to Tablespoons CalculatorConvert teaspoons to US tablespoons, cups, fluid ounces and millilitres for recipes, medicine-cup cautions, kitchen batching and classroom worksheets, with scaling, rounding and a printable spoon-measure record.Trade & ConstructionTile CalculatorEstimate floor or wall tiles from area, tile size, grout gap, waste allowance and box size.Work & PayrollTime and a Half CalculatorCalculate time-and-a-half pay from regular hours, time-and-a-half hours, base hourly rate and optional extra pay, with the formula and printable payroll note kept visible.Time & DateTime CalculatorAdd or subtract time durations and see the result normalised into days, hours, minutes and seconds.Time, Work & PayrollTime Card CalculatorTotal a weekly time card from daily hours, unpaid breaks, overtime threshold and hourly rate, with regular/overtime split, gross-pay estimate and a printable work record for payroll prep, invoices and classroom examples.Work Hours & PayrollTime Clock CalculatorCalculate clock-in to clock-out hours, unpaid breaks, rounded payable time and a simple gross-pay estimate with a printable time clock record.Time & DateTime Until CalculatorCalculate the exact time until a target date and time from an editable current date and time.Time & DateTime Zone CalculatorConvert a clock time between two UTC offsets, check date rollover and prepare a printable meeting-time record with the assumptions kept visible.Work Hours & PayrollTimesheet CalculatorTotal weekly timesheet hours, unpaid breaks, overtime split and gross pay from daily hour entries, with a printable work-time record for payroll checks, invoices and job notes.Time & DateTimezone Meeting CalculatorConvert a meeting time between two UTC offsets and see the matching time, date shift and practical scheduling notes.Percentage & MoneyTip CalculatorCalculate a restaurant tip, final bill total and per-person split from the bill amount, tip percentage, tax and party size.Home, Trade & ConstructionTopsoil CalculatorEstimate topsoil volume from length, width and depth, with cubic-yard, cubic-foot, cubic-metre, litre, bag and bulk-order checks plus a printable garden or landscaping job note.Math & MeasurementTriangle Area CalculatorCalculate triangle area from base and height, with side-length cross-checks, optional planning allowance and a printable geometry record.ConversionsUnit ConverterConvert common length, weight, volume and temperature units with the formula, exact basis and printable conversion record kept visible.Everyday MathUnit Price CalculatorCompare two package prices by price per unit, with the cheaper option, unit-price gap and printable shopping, classroom or supplier quote note shown clearly.ConversionsUS Gallons to Litres CalculatorConvert US liquid gallons to litres, with optional allowance kept separate for fuel, aquarium, brewing, cleaning, garden and trade records.Immigration & LegalUSCIS 90-Day Rule CalculatorCalculate day 90 and day 91 from a US entry date for immigration planning discussions.Math & StatisticsVariance CalculatorCalculate population variance and sample variance for a small data set, with the mean, squared differences and denominator shown clearly.BusinessVAT / GST CalculatorAdd tax to a net price, remove tax from a gross price, and show the tax amount clearly for receipts, quotes and classroom checks.Construction & HomeWallpaper CalculatorEstimate wallpaper rolls from wall width, wall height, roll size, repeat allowance and openings, with the formula and printable room note kept visible.Health & FitnessWater Intake CalculatorEstimate a daily water target from body weight, exercise minutes, climate adjustment and pregnancy/breastfeeding context.Events & WeddingsWedding Budget CalculatorBuild a wedding budget from guests, catering, venue, photography, music, flowers, other costs and contingency.Photography / EventsWedding Photography Rate CalculatorEstimate a minimum wedding photography package rate from target salary, business costs, booking count, hours and profit margin.Time & DateWeeks Between Dates CalculatorConvert two calendar dates into elapsed days, exact decimal weeks and whole weeks plus remaining days.Time & Duration ConversionWeeks to Days CalculatorConvert weeks into days, hours, minutes and seconds for schedules, leave plans, project timelines, pregnancy or classroom worksheets, with repeat counts, rounding and a printable duration record.Time and DateWeeks to Hours CalculatorConvert weeks to hours using 1 week = 168 hours, with extra days and hours, repeat counts, minute/second/day cross-checks, optional hourly value and a printable schedule, timesheet or classroom duration record.Study & SchoolWeighted Average CalculatorCalculate a weighted mean from values and weights for grade categories, credits, survey scores, index components and spreadsheet checks, with contribution lines, total-weight warnings and a printable weighted-average worksheet record.Time & DateWork Hours CalculatorWork out paid hours from start time, finish time and unpaid break minutes.Measurement & UnitsYards to Feet CalculatorConvert yards to feet for fabric, field measurements, landscaping notes, classroom work and quote worksheets, with allowance kept separate from the exact conversion.Measurement ConversionYards to Inches CalculatorConvert yards to inches, feet and metres with an optional cutting or ordering allowance kept separate for fabric, field, rope, classroom and quote records.Measurement ConversionYards to Metres CalculatorConvert yards to metres, centimetres and feet with an optional planning allowance for measuring, sports, fabric, landscaping and classroom records.Measurement & Unit ConversionYards to Miles CalculatorConvert yards into miles, feet, inches, kilometres and metres for routes, races, property notes, sports fields, cable runs and classroom worksheets, with allowance, rounding and a printable distance record.