Calculator category
Math Calculators
Use these math calculators for percentages, fractions, ratios, and everyday number checks.
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Percentage CalculatorUse this percentage calculator to find percentages, percentage increase or decrease, and what percent one number is of another.Fraction CalculatorUse this fraction calculator to add, subtract, multiply, divide, simplify fractions, and convert the result to decimal.Ratio CalculatorUse this ratio calculator to simplify ratios, find equivalent ratios, and calculate a matching value by proportion.Area CalculatorCalculate area from shape and length with this area calculator; review the formula, rounding, worked example, and related calculator checks.Basic CalculatorCalculate result from expression and decimal places with this basic calculator; review the formula, rounding, worked example, and related calculator.Big Number CalculatorCalculate result from operation and first integer with this big number calculator; review the formula, rounding, worked example, and related calculator.Circle CalculatorCalculate radius from known value and length with this circle calculator; review the formula, rounding, worked example, and related calculator checks.Common Factor CalculatorCalculate common factors from integers with this common factor calculator; review the formula, rounding, worked example, and related calculator checks.
All available math calculators
Choose the calculator by the result you need first, then check the page assumptions and sources before reusing the answer.
Percentage CalculatorUse this percentage calculator to find percentages, percentage increase or decrease, and what percent one number is of another.Percent of numberFraction CalculatorUse this fraction calculator to add, subtract, multiply, divide, simplify fractions, and convert the result to decimal.ResultRatio CalculatorUse this ratio calculator to simplify ratios, find equivalent ratios, and calculate a matching value by proportion.Matching second valueArea CalculatorCalculate area from shape and length with this area calculator; review the formula, rounding, worked example, and related calculator checks.AreaBasic CalculatorCalculate result from expression and decimal places with this basic calculator; review the formula, rounding, worked example, and related calculator.ResultBig Number CalculatorCalculate result from operation and first integer with this big number calculator; review the formula, rounding, worked example, and related calculator.ResultCircle CalculatorCalculate radius from known value and length with this circle calculator; review the formula, rounding, worked example, and related calculator checks.RadiusCommon Factor CalculatorCalculate common factors from integers with this common factor calculator; review the formula, rounding, worked example, and related calculator checks.Common factorsDice RollerCalculate dice notation from number of dice and sides per die with this dice roller; review the formula, rounding, worked example, and related calculator.Dice notationDistance CalculatorCalculate distance from first point x and first point y with this distance calculator; review the formula, rounding, worked example, and related.DistanceExponent CalculatorCalculate result from base and exponent with this exponent calculator; review the formula, rounding, worked example, and related calculator checks.ResultFactor CalculatorCalculate factors from integer with this factor calculator; review the formula, rounding, worked example, and related calculator checks.FactorsGCF CalculatorCalculate greatest common factor from integers with this GCF calculator; review the formula, rounding, worked example, and related calculator checks.Greatest common factorHalf-Life CalculatorCalculate remaining amount from solve for and initial amount with this half-life calculator; review the formula, rounding, worked example, and related.Remaining amountLCM CalculatorCalculate least common multiple from integers with this LCM calculator; review the formula, rounding, worked example, and related calculator checks.Least common multipleLog CalculatorCalculate logarithm from number and base with this log calculator; review the formula, rounding, worked example, and related calculator checks.LogarithmLong Division CalculatorCalculate quotient from dividend and divisor with this long division calculator; review the formula, rounding, worked example, and related calculator.QuotientMatrix CalculatorCalculate result matrix from operation and matrix A with this matrix calculator; review the formula, rounding, worked example, and related calculator.Result matrixNumber Sequence CalculatorCalculate generated terms from sequence type and first term with this number sequence calculator; review the formula, rounding, worked example.Generated termsPassword GeneratorGenerate generated password from password length and uppercase letters with this password generator; review the formula, rounding, worked example.Generated passwordPercent Error CalculatorCalculate percent error from measured value and accepted value with this percent error calculator; review the formula, rounding, worked example.Percent errorPrime Factorization CalculatorCalculate prime factorization from integer with this prime factorization calculator; review the formula, rounding, worked example, and related calculator.Prime factorizationPythagorean Theorem CalculatorCalculate missing side from missing side and leg a with this pythagorean theorem calculator; review the formula, rounding, worked example, and related.Missing sideQuadratic Formula CalculatorCalculate first root real part from coefficient a and coefficient b with this quadratic formula calculator; review the formula, rounding, worked example.First root real partRandom Number GeneratorGenerate generated numbers from minimum and maximum with this random number generator; review the formula, rounding, worked example, and related.Generated numbersRight Triangle CalculatorCalculate hypotenuse from leg A and leg B with this right triangle calculator; review the formula, rounding, worked example, and related calculator checks.HypotenuseRoot CalculatorCalculate real root from number and root degree with this root calculator; review the formula, rounding, worked example, and related calculator checks.Real rootRounding CalculatorCalculate rounded value from number and places with this rounding calculator; review the formula, rounding, worked example, and related calculator checks.Rounded valueScientific CalculatorCalculate result from expression and angle mode with this scientific calculator; review the formula, rounding, worked example, and related calculator.ResultScientific Notation CalculatorCalculate scientific notation from conversion and decimal number with this scientific notation calculator; review the formula, rounding, worked example.Scientific notationSimple Interest CalculatorCalculate interest amount from principal and annual interest rate with this simple interest calculator; review the formula, rounding, worked example.Interest amountSlope CalculatorCalculate slope from first point x and first point y with this slope calculator; review the formula, rounding, worked example, and related calculator.SlopeSurface Area CalculatorCalculate surface area from shape and length with this surface area calculator; review the formula, rounding, worked example, and related calculator.Surface areaTriangle CalculatorCalculate area from side a and side b with this triangle calculator; review the formula, rounding, worked example, and related calculator checks.AreaVolume CalculatorCalculate volume from shape and length with this volume calculator; review the formula, rounding, worked example, and related calculator checks.Volume
How to choose
Start with the calculator that matches the number relationship you need: percentages for parts of a whole, fractions for exact rational values, and ratios for proportional scaling.
Math Calculators FAQ
Which math calculator should I use first?
Use the percentage calculator for percent-of and increase/decrease questions, the fraction calculator for exact fraction operations, and the ratio calculator for proportional scaling.
Are these math calculators exact?
The raw formulas use exact arithmetic where practical, then round only the displayed result. Each calculator page explains its rounding rule.