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All Calculators

Every calculator on this site, grouped by what it does. They all update as you type, show the formula with your own numbers in it, and expand to reveal the working line by line.

Percentages

Percentage of a number, percentage change and difference, conversions.

Percentage CalculatorX% of Y, X as a % of Y, and the whole from a part.Decimal to Percent CalculatorAny decimal as a percentage, with the fraction too.Percent Error CalculatorAccepted vs measured, with absolute and signed error.Percent to Decimal CalculatorAny percentage as a decimal, fraction and per mille.Percentage Change CalculatorPercentage increase or decrease between two values.Percentage Difference CalculatorSymmetric % difference, with % change both ways.Ratio to Percentage CalculatorA:B as a percentage, both ways of reading it.Reverse Percentage CalculatorWork back to the original amount before a change.What Percent Of CalculatorX is what percent of Y, with the division shown.

Money & business

Tips, sales tax, discounts, margin and markup, interest and unit prices.

Tip CalculatorTip, total and each person’s share, rounded your way.Margin CalculatorGross margin, markup and profit from cost and price.Markup CalculatorSolve for cost, markup, price or profit — any two.Percent Off CalculatorSale price, savings, stacked discounts and sales tax.Sales Tax CalculatorAdd tax, take it back out, or find the rate.Simple Interest CalculatorI = P × r × t, solved for any of the four.Stock Average CalculatorBlended cost per share across several buys.Unit Price CalculatorCompare four sizes and find the real best value.

Fractions

Fraction arithmetic, simplifying, common denominators and conversions.

Fraction CalculatorAdd, subtract, multiply and divide fractions.Decimal to Fraction CalculatorDecimals to exact fractions, recurring ones included.Fraction to Decimal CalculatorFractions to decimals, terminating or recurring.Improper Fraction CalculatorImproper fractions to mixed numbers, simplified.Least Common Denominator CalculatorThe LCD, and each fraction rewritten over it.Mixed Number CalculatorMixed numbers to improper fractions, and arithmetic.Simplify Fractions CalculatorAny fraction in lowest terms, with the GCF shown.Subtracting Fractions CalculatorFraction arithmetic with the LCD worked out.

Factors, multiples & primes

Factors, GCF, LCM and prime factorization, with the working.

Factor CalculatorEvery factor, the factor pairs, and prime or composite.GCF CalculatorGreatest common factor by primes and by Euclid.LCM CalculatorLeast common multiple, with the prime-power table.Prime Factorization CalculatorExponent form, the division ladder and a factor tree.

Ratios & proportions

Simplify and solve ratios, proportions and scale factors.

Ratio CalculatorSimplify a ratio, solve A:B = C:?, or share a total.Proportion CalculatorSolve a/b = c/d for the missing value.Scale Factor CalculatorFind or apply a scale factor; area and volume too.

Averages & statistics

Mean, median, mode and weighted average, with every value plotted.

Mean, Median, Mode CalculatorAll four measures with the working for each.Average CalculatorMean, median, mode and range from any list of numbers.Median CalculatorThe middle value, plus quartiles and the IQR.Weighted Average CalculatorValues and weights, with each item’s share shown.

Grades

Test scores, letter grades and the score you need on the final.

Grade Calculator (EZ Grader)Score and letter grade from the number wrong.Final Grade CalculatorThe score you need on the final exam.

Arithmetic & number rules

Long division, rounding, roots, order of operations and exact big-number maths.

Square Root Calculator√x as a decimal and in simplest radical form.Absolute Value Calculator|x| for numbers and full expressions.Big Number CalculatorExact arithmetic on numbers of any length.Division CalculatorLong division worked through digit by digit.Long Division CalculatorThe full written method, digit by digit.Multiplication CalculatorProducts with the partial-product working shown.Order of Operations CalculatorAny expression solved in the correct order.PEMDAS CalculatorPEMDAS, BODMAS and BIDMAS, one step at a time.Remainder CalculatorRemainder, quotient and modulo — negatives included.Rounding CalculatorEvery rounding place and rule, side by side.Significant Figures CalculatorRound to N sig figs, or count the ones you have.

Charts

Printable reference tables.

Multiplication ChartTimes tables 1–12 (and up to 20), with patterns explained.Perfect SquaresEvery perfect square from 1 to 10,000, and how to spot one.Fraction to Decimal ChartThe conversion chart, both directions explained.

The basic calculator

The plain four-function keypad, with a tape.

Four Function CalculatorAdd, subtract, multiply and divide, with a printable tape.
Shows the workingRuns entirely in your browser — nothing you type is sent anywhere.Last reviewed 1 October 2026

Four Function Calculator

Free math calculators that show their working. No sign-up, no app, and nothing you type leaves your device.

© 2026 fourfunctioncalculator.comPrivacy · Terms · Last reviewed 1 October 2026