Math Calculators
Find a percentage, simplify a fraction, solve a quadratic or a system of equations, or break a number into prime factors. Each page explains the method with a worked example.
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32 toolsArithmetic Sequence Calculator
Find arithmetic terms and sums from a common difference or the first two terms, with opening and final-term evidence.
Open calculatorComplex Number Calculator
Calculate with rectangular or polar complex operands and compare magnitude, angle and conjugate.
Open calculatorDecimal to Fraction Calculator
Convert finite or repeating decimals to exact fractions, with recurring digits entered together or in separate fields.
Open calculatorDiscount Calculator
Find sale price, original price, or discount rate, with stacked discounts, coupons and optional tax.
Open calculatorExponent Calculator
Calculate real powers from decimal or fraction exponents, including negative bases with an odd reduced denominator.
Open calculatorFour-Function Calculator
Calculate decimal expressions using a touch keypad or keyboard, with memory, answer reuse and a session history.
Open calculatorFraction Calculator
Calculate with fractions or mixed numbers, reduce the answer, and see the working and equivalent forms.
Open calculatorGCD and LCM Calculator
Find exact greatest common divisors and least common multiples for two integers or a pasted list.
Open calculatorGeometric Sequence Calculator
Find geometric terms and finite or convergent infinite sums from a multiplier or the first two terms.
Open calculatorHarmonic Mean Calculator
Find equal-weight or weighted harmonic means of positive values and compare the corresponding arithmetic mean.
Open calculatorInteger Calculator
Evaluate signed whole-number expressions with parentheses and exact fractions, then inspect each arithmetic step.
Open calculatorLarge Number Calculator
Calculate large decimals and integers, preserve full results, and choose rounding for division and square roots.
Open calculatorLinear Interpolation Calculator
Find y from x or x from y on a line between two known points, with slope and explicit extrapolation.
Open calculatorLogarithm Calculator
Calculate a selected-base logarithm and compare common, natural and binary logarithms of the same positive number.
Open calculatorLong Division Calculator
Divide whole numbers or finite decimals with exact quotient, original-unit remainder, decimal expansion and scaled division steps.
Open calculatorMatrix Determinant Calculator
Edit square matrix cells or paste rows to find a determinant and inspect its pivots and row swaps.
Open calculatorMatrix Multiplication Calculator
Edit or paste compatible matrices, multiply them and inspect row-by-column working for a selected result cell.
Open calculatorModulo Calculator
Find exact nonnegative modulo results for safe or large integers and compare the signed truncating remainder.
Open calculatorPercent Error Calculator
Compare measured and reference values with absolute and signed percent error and an optional entered tolerance range.
Open calculatorPercentage Calculator
Find percentages, percentage change, a whole amount, or a value after adding or subtracting a percentage.
Open calculatorPercentage Difference Calculator
Compare two values or percentage rates using a symmetric average base, with a separate percentage-point gap for rates.
Open calculatorPermutation and Combination Calculator
Count ordered sequences and unordered selections of distinct item types, with or without replacement.
Open calculatorPrime Factorization Calculator
Find prime powers and divisor counts, with optional positive-divisor lists and matching factor pairs.
Open calculatorQuadratic Equation Calculator
Solve quadratic coefficients or plain equations with rearranged coefficients, discriminant classification and numerical roots.
Open calculatorRatio Calculator
Simplify whole-number or decimal ratios into exact integer parts and divide a total into two proportional shares.
Open calculatorReverse Percentage Calculator
Recover the original amount before one or two known percentage changes, with intermediate and combined results.
Open calculatorRoot Calculator
Find square, cube or custom-degree real roots and optionally show real solutions of the corresponding power equation.
Open calculatorRoot Mean Square Calculator
Calculate equal or weighted RMS and arithmetic mean from signed samples, with squared-contribution evidence.
Open calculatorScientific Notation Calculator
Convert coefficient/exponent or pasted decimal and scientific forms into scientific, engineering, E and decimal notation.
Open calculatorSlope Calculator
Find a line from two points or signed rise and run, with equation, inclination, percentage slope and distance.
Open calculatorSystem of Equations Calculator
Solve two linear equations from coefficient fields or plain x/y text and inspect unique-solution substitution.
Open calculatorVector Dot Product Calculator
Enter vector lists or individual 2D/3D components to find dot product, angle and projection of A onto B.
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