CalculationTime

Time calculators

Almost every CalculationTime tool is a time tool somewhere underneath. This hub gathers clocks, dates, durations, calendars and sky-time instruments.

Time Duration Calculator
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.FinanceMortgage Payment CalculatorEstimate a monthly principal-and-interest mortgage payment from loan amount, interest rate and term, with optional tax and insurance fields.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.Time & DateTime Duration CalculatorCalculate the hours and minutes between two times, including overnight spans.Time & DateDate CalculatorAdd or subtract calendar days from a start date using clear Gregorian calendar arithmetic.Time & DateAge CalculatorCalculate age from a birth date to a chosen date, with years, months and days 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.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.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.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.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.Health & FitnessBody Fat Percentage CalculatorEstimate body fat percentage from circumference measurements using the U.S. Navy method for adults.Work & PayrollBusiness Days CalculatorCount weekday business days between two dates, with optional start-date and end-date inclusion controls.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.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.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.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.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.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.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.Time & DateEvent Duration CalculatorCalculate gross and net duration for an event, appointment, class, meeting or shift.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.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.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.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.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.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.Study & SchoolGrade Percentage CalculatorTurn points earned and points possible into a percentage score, with an example letter band and clear extra-credit notes.Work & PayrollHourly Rate CalculatorConvert annual salary or project fees into transparent hourly rates using entered work hours.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.ConversionsInches to Centimetres CalculatorConvert inches into centimetres and metres using the exact international inch definition.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.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.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.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.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 ConversionMillimetres to Centimetres CalculatorConvert millimetres to centimetres, metres and inches with an optional tolerance kept separate for drawings, parts, product dimensions and classroom worksheets.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.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.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.Trade & ConstructionPaint Coverage CalculatorEstimate paint quantity from wall length, wall height, openings, coats, coverage rate and waste allowance, with a printable room-painting record.Math & PercentagesPercent Off CalculatorCalculate the sale price, amount saved and optional tax total when a percentage is taken off an original price.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.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.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.Health & LifecyclePregnancy Due Date CalculatorEstimate due date, gestational age and trimester from last menstrual period, conception, IVF transfer or ultrasound dating.MoneyPresent Value CalculatorDiscount a future amount back to today using an annual rate, time horizon and compounding frequency.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.FinanceRefinance CalculatorCompare an existing loan with a refinance offer using payment, monthly saving, closing costs and break-even month.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.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.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.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.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.Percentage & MathSquare Root CalculatorFind the principal square root of a number, its square check and an optional rounded classroom or worksheet result.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.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.Immigration & LegalUSCIS 90-Day Rule CalculatorCalculate day 90 and day 91 from a US entry date for immigration planning discussions.Time & DateWeek Number CalculatorFind the ISO week number, ISO week-year and weekday for a calendar date, with a simple year-boundary explanation.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.