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Free Math Calculators for School, Work and Everyday Use

These free calculators handle percentages, fractions, averages, statistics, number theory, algebra and geometry. Each one shows the working as well as the answer, and everything runs in your browser.

Everyday math

Percentage CalculatorFind a percent of a number, percent change, and percent increase or decrease. Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers. Ratio CalculatorSimplify ratios, solve proportions and split a total by a ratio.

Statistics

Average CalculatorMean, median, mode, range, sum and count for a list of numbers. Standard Deviation CalculatorSample or population standard deviation and variance for a list of numbers. Percent Error CalculatorPercent, absolute and relative error between measured and true values. Z-Score CalculatorZ-score, percentile and normal curve probability from a value. Weighted Average CalculatorWeighted mean of values that carry different weights.

Number theory

GCD and LCM CalculatorGreatest common divisor and least common multiple of two or more numbers. Prime Number CheckerCheck if a number is prime and see its prime factorization. Fibonacci CalculatorFind the nth Fibonacci number, list terms or test a number.

Probability

Permutation and Combination CalculatorExact nPr, nCr and factorial values, even for large numbers.

Algebra

Quadratic Equation SolverSolve ax² + bx + c = 0 and see the roots, discriminant and vertex. Exponent and Root CalculatorRaise to a power, or find the square, cube or nth root. Logarithm CalculatorLog to any base, natural log, log10, log2 and antilog. Arithmetic and Geometric Series Calculatornth term, sum and listed terms of arithmetic and geometric sequences.

Number tools

Scientific Notation ConverterConvert numbers to scientific, engineering and E-notation, and back. Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100, 1000. Collatz Sequence CalculatorSteps, peak and full list of the 3n+1 sequence. Perfect Number CheckerPerfect, abundant, deficient or amicable? Divisors and sum. Modulo Calculatora mod b, remainder and quotient, including negative numbers. Number to Ordinal ConverterConvert numbers to 1st, 2nd, 3rd and to words, and back. Number AbbreviatorShorten numbers to 1.2K or 3.4M and expand them back. Matrix CalculatorDeterminant, inverse, transpose, multiply and more. Vector CalculatorMagnitude, dot and cross product, angle and projection. ISBN ValidatorValidate ISBN-10 and ISBN-13 and convert between them. Pi Digits ViewerDigits of pi, e, phi and root 2, with a digit search. Trigonometry CalculatorSin, cos, tan and their inverse functions. Cubic Equation SolverAll real and complex roots of a cubic equation. Luhn Check Digit GeneratorFind the Luhn check digit or test a full number. Triangular Number Calculatornth figurate number, a membership test and the first terms.

Education

GPA CalculatorWork out semester or cumulative GPA from grades and credit hours.

Geometry

Distance, Midpoint and Slope CalculatorDistance, midpoint, slope and line equation from two points. Area CalculatorArea and perimeter of common shapes. Volume CalculatorVolume and surface area of common 3D shapes. Pythagorean Theorem CalculatorFind the missing side of a right triangle and its angles. Triangle CalculatorArea, angles and type of a triangle from its three sides.

Calculators

Online CalculatorType a sum like (12 + 8) * 3 and get the answer. Grade Curve CalculatorCurve scores by adding points, scaling or square root. Grade CalculatorFind your grade, or the final exam score you need. Parabola CalculatorVertex, focus, directrix and roots of a parabola. Hyperbola CalculatorFoci, vertices, eccentricity and asymptotes of a hyperbola.

How These Math Calculators Work

Every calculator on this site runs inside your browser with JavaScript. The numbers you type are processed on your own device. They are not uploaded, stored or logged, and no outside service is involved.

There is no signup and no limit. Each tool prints the answer and then the working, such as the formula, the steps or a table, so you can check the result or copy it into homework or a report.

Which Calculator Should I Use?

Looking for something else? See the free text tools, website tools, DNS tools and IP tools. For the maths behind it all, the Wikipedia overview of mathematics is a good start.