Math & Statistics
From quick percentage math to quadratic equations, matrices and descriptive statistics — each with worked, step-by-step output.
12 tools, all running in your browser.
Fig 1 Chance, adding up
Move across to land the last balls · ← →
Each peg is a fair choice; each bin counts the rights. The readout is the real mean and spread of the balls shown, the kind of sum the statistics tools here work out for you.
Most used
Fraction Calculator Add, subtract, multiply and divide fractions and mixed numbers. Shows the common denominator, the simplification and the decimal equivalent. Percentage Calculator Work out X% of Y, what percent one number is of another, percentage increase or decrease, and add or subtract a percentage — with steps. Scientific Calculator Scientific calculator with trig in degrees or radians, logs, powers, roots, factorials, memory keys, parentheses and a full history tape.
Everything else
Average Calculator Paste any list of numbers to get the mean, median, mode, range, sum and count instantly, plus quartiles and a sorted view of your data. Decimal to Fraction Convert any decimal to an exact fraction, including repeating decimals written as 0.(3). Get simplified, mixed and unreduced forms with steps. Exponent and Log Calculator Raise numbers to any power, take nth roots, and compute logs in any base including ln and log₁₀, with the identities and steps shown. GCD and LCM Calculator Find the greatest common divisor and least common multiple of any list of numbers, with Euclidean algorithm steps and prime factorisations. Prime Number Checker Test whether a number is prime, see its full prime factorisation and divisors, find the nearest primes, and list every prime in a range. Quadratic Equation Solver Solve ax² + bx + c = 0 for real or complex roots. Shows the discriminant, vertex, axis of symmetry, factored form and a parabola graph. Ratio Calculator Solve A:B = C:D for a missing term, simplify a ratio to lowest terms, scale it up or down, and split a total amount by any ratio. Standard Deviation Calculator Sample and population standard deviation and variance from any list of numbers, with the full deviation table, the formula and a dot plot. Triangle Calculator Solve any triangle from SSS, SAS, ASA, AAS or SSA inputs. Get every side, angle, area, perimeter and height with a to-scale diagram.