44 free tools · no sign-up
Math calculators that show their working
Percentages, fractions, algebra, geometry and statistics, with the working shown step by step.
No tools match that search. Browse all calculators.
Basic math
Percentages, fractions, ratios, roots and more.
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Scientific Calculator
Free online scientific calculator with trig in degrees or radians, logs, powers, roots, factorials, memory and history.
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Percentage Calculator
Percent of a number, what percent one number is of another, percentage change and difference.
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Basic Calculator
A simple online calculator for everyday sums: add, subtract, multiply, divide, percent, memory and a tape.
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Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers, simplify fractions and turn decimals into fractions.
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Average Calculator
The mean of a list of numbers with the working shown, plus a weighted average for grades and scores.
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Ratio Calculator
Simplify ratios, solve A : B = C : D for a missing value, scale a ratio or split a total, with fractions and percentages.
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Percent Error Calculator
How far a measured value is from the accepted value, as a percent error with the sign and the working shown.
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Rounding Calculator
Round to decimal places, significant figures, the nearest 10, 100 or 1,000, or the nearest fraction, with six rounding rules.
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Exponent Calculator
Raise any number to any power, including negative and fractional exponents, or solve for the exponent or the base.
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Root Calculator
Square roots, cube roots and any nth root, with the simplified radical form such as √72 = 6√2.
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Log Calculator
Logarithms in base 10, base e (ln), base 2 or any base, and solve log equations for x or for the base.
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Scientific Notation Calculator
Convert numbers to scientific, E and engineering notation and back, and add, subtract, multiply or divide in a × 10ⁿ form.
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Long Division Calculator
Long division with every step shown: quotient, remainder and the decimal answer with repeating digits marked.
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Big Number Calculator
Exact arithmetic on whole numbers with hundreds or thousands of digits: add, multiply, divide, powers, factorials and GCD.
Algebra & numbers
Factors, primes, equations, sequences and number bases.
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Quadratic Formula Calculator
Solve ax² + bx + c = 0 with exact and decimal roots, the discriminant, vertex and factored form.
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Prime Factorization Calculator
Break a number into prime factors with exponents, see the factor tree, check if it is prime and count its divisors.
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Factor Calculator
Every factor and factor pair of a whole number, with the count, the sum and prime, perfect or abundant checks.
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GCF Calculator
Greatest common factor of two or more whole numbers, with Euclid's algorithm and a prime factorization check.
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LCM Calculator
Least common multiple of two or more whole numbers, worked out by prime factorization and by the GCF method.
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Matrix Calculator
Add, subtract and multiply matrices up to 6 × 6, or find the determinant, inverse, transpose and rank.
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Number Sequence Calculator
The nth term, sum and list of terms for arithmetic, geometric and Fibonacci-like sequences, or find the pattern.
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Common Factor Calculator
Every factor shared by two or more whole numbers, with the greatest common factor and each number's factor list.
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Binary Calculator
Add, subtract, multiply and divide binary numbers, run AND, OR, XOR and NOT, and convert binary, octal, decimal and hex.
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Hex Calculator
Hexadecimal arithmetic, hex to decimal and binary conversion, and two's complement for 8, 16, 32 and 64-bit numbers.
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Random Number Generator
Pick random whole numbers or decimals in any range, one or thousands at a time, with or without repeats.
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Half-Life Calculator
Radioactive decay and other exponential decay: find the amount left, the starting amount, the time or the half-life.
Geometry
Area, volume, triangles, circles and slopes.
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Triangle Calculator
Solve any triangle from three sides or angles: missing sides and angles, area, perimeter, heights and radii.
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Right Triangle Calculator
Enter any two of the legs, hypotenuse, angles or area to solve a right triangle completely.
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Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg of a right triangle with a² + b² = c², shown step by step.
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Circle Calculator
Radius, diameter, circumference and area from any one of them, plus arc length and sector area for an angle.
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Slope Calculator
Slope of a line from two points, or its equation from a point and a slope, with intercepts, angle and distance.
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Distance Calculator
Straight-line distance between 2D or 3D points, or the great-circle distance between two places on Earth.
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Area Calculator
Area of a square, rectangle, triangle, circle, ellipse, trapezoid, parallelogram, sector or regular polygon.
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Volume Calculator
Volume of a cube, box, cylinder, cone, sphere, pyramid, capsule or tube, in cubic units, liters and gallons.
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Surface Area Calculator
Lateral and total surface area of a cube, box, cylinder, cone, sphere, pyramid, capsule or tube.
Statistics & probability
Averages, standard deviation, z-scores and odds.
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Standard Deviation Calculator
Sample and population standard deviation, variance and mean of a list of numbers, with every step shown.
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Statistics Calculator
Descriptive statistics for a list: mean, median, mode, quartiles, IQR, outliers, variance, SD and skewness.
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Mean, Median, Mode & Range Calculator
The mean, median, mode and range of a list of numbers, with the sorted list and each step explained.
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Sample Size Calculator
How many survey responses you need for a given confidence level and margin of error, or the margin for your sample.
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Probability Calculator
P(A and B), P(A or B) and P(not A) for independent events, at least one success in n tries, and binomial odds.
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Permutation and Combination Calculator
nPr and nCr, with or without repetition, as exact whole numbers even when they run to thousands of digits.
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Z-Score Calculator
The z-score and percentile of a value, the probability between two values, and the value at any percentile.
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Confidence Interval Calculator
Confidence interval and margin of error for a mean (t or z) or a proportion, at any confidence level.
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P-Value Calculator
p-value from a z-score, t-score or chi-square statistic, one- or two-tailed, with significance at 0.05 and 0.01.
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