Math Calculators | CalculationTime

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.Percentage & MathAverage CalculatorCalculate the mean, median, mode and range of any list of numbers in a live sandbox - add or remove values freely and every statistic updates instantly, with a printable custom report and a standalone statistics reference sheet.Core MathematicsCircle CalculatorCalculate circle area, circumference, diameter/radius checks, and optional planning allowance from a radius or diameter.Math & MeasurementCircumference CalculatorCalculate the distance around a circle from radius or diameter, with area, allowance 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.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.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.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.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.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.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.MathNumber Format ConverterConvert decimals, fractions and percentages in one bidirectional number-format tool with simplified fractions, percent output and printable proof.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 & StatisticsPercent Error CalculatorCalculate percent error between an experimental or measured value and an accepted reference value, with absolute and signed error shown clearly.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.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.MathPercentage of a Number CalculatorCalculate a percentage of any number, with the amount, remaining value and printable working shown clearly.Math & MeasurementPerimeter CalculatorCalculate the perimeter of a rectangle from length and width, with optional allowance for edging, trim, fencing, borders or classroom worksheets.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.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 & StatisticsRandom Number Generator CalculatorGenerate a reproducible pseudo-random number between two limits, with optional integer mode, seed, draw count and range-size proof.MathRange CalculatorFind the range of up to six numbers, with the minimum, maximum and difference shown for classroom, score and measurement checks.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.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.MathScientific Notation CalculatorConvert a number into scientific notation, standard decimal form and order-of-magnitude wording with the formula and rounding basis visible.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.Percentage & MathSquare Root CalculatorFind the principal square root of a number, its square check and an optional rounded classroom or worksheet result.Math & StatisticsStandard Deviation CalculatorCalculate mean, population standard deviation and sample standard deviation for a small data set, with the squared-difference method visible.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.Time & DateTime Duration CalculatorCalculate the hours and minutes between two times, including overnight spans.Percentage & MoneyTip CalculatorCalculate a restaurant tip, final bill total and per-person split from the bill amount, tip percentage, tax and party size.Math & MeasurementTriangle Area CalculatorCalculate triangle area from base and height, with side-length cross-checks, optional planning allowance and a printable geometry record.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.Math & StatisticsVariance CalculatorCalculate population variance and sample variance for a small data set, with the mean, squared differences and denominator shown clearly.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.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.