Math Calculators

Calculate the area of a square, rectangle, triangle, circle, trapezoid, parallelogram or ellipse. Each shape shows the formula and step-by-step working, so it is perfect for homework, DIY and construction.

Calculate the arithmetic mean, weighted average (GPA) and moving average of your numbers. The median, mode, standard deviation and range appear automatically for a full statistical summary in one place.

A free online calculator with standard, scientific (sin, cos, log, sqrt, n!) and programmer (BIN, OCT, HEX) modes. Full keyboard support and operation history make everyday and complex maths quick and easy.

Calculate combinations C(n,r) and permutations P(n,r) with full BigInt precision and step-by-step formulas. Ideal for probability, statistics, lottery odds and any counting problem you need to solve fast.

Calculate the distance between two GPS coordinates in kilometres and miles using the Haversine formula, and convert between decimal degrees (DD) and degrees-minutes-seconds (DMS) formats with one click.

Calculate any power aⁿ, including negative and fractional exponents, with scientific notation and a clear step-by-step explanation. A handy tool for algebra and compound-growth problems of any size.

Calculate n! for any integer from 0 to 170 with full BigInt precision. View the step-by-step product expansion, total digit count and scientific notation — ideal for probability and combinatorics.

Calculate your weighted course grade from midterm and final scores, with the resulting letter grade and GPA points. Find out exactly what grade you need on the final exam to pass or hit your target.

Find the greatest common divisor (GCD) and least common multiple (LCM) of up to six numbers. See the Euclidean algorithm steps and prime factorisation so you understand exactly how each result is reached.

Convert numeric grades into letter grades (A, B, C and more) on a 4.0 scale, and calculate your weighted GPA from your courses, grades and credit hours. Plan a semester or your whole program in seconds.

Split any value by the golden ratio (φ = 1.618) into its larger and smaller parts, or find the whole from a single part. A visual ratio bar makes it perfect for design, photography, layout and architecture.

Use the percentage calculator to find a percentage of a number, percentage increase or decrease, and reverse percentage. Work out profit, loss, discount and change rates with clear, instant formulas.

Calculate the perimeter of a square, rectangle, triangle, circle, semicircle, ellipse or regular polygon. Every shape displays its formula and step-by-step working for clear, reliable measurements.

Break any number into its prime factors with a step-by-step division table. View the exponent form, the full list of divisors and a prime-number check — perfect for number theory and GCD/LCM problems.

Convert numbers to Roman numerals (1 to 3,999,999 with vinculum support) and back again, and write any date in Roman numerals. A step-by-step breakdown shows exactly how each symbol is formed.

Calculate room, apartment or land area in square metres (m²). Add multiple rooms for the total area, then get a tile and flooring material estimate — ideal for renovation, rent and real-estate planning.

Calculate the square root (√), cube root (∛) and any nth root with decimal precision. Includes a perfect-square check and result verification, making it ideal for algebra, geometry and quick everyday maths.

A millisecond-precise online stopwatch and countdown timer in one. Record laps, pause and reset, use keyboard shortcuts and set an audible alarm — perfect for workouts, cooking, study and presentations.

Convert length, weight, area, volume and temperature units instantly: inch to cm, mile to km, gallon to litre, Fahrenheit to Celsius and over 50 more. A fast metric and imperial converter for everyday use.

Calculate the volume of a cube, rectangular prism, cylinder, sphere, hemisphere, cone or pyramid. Each shape shows the formula and step-by-step working — ideal for school, packaging and engineering tasks.

Convert grams, kilograms, tonnes, pounds, ounces and carats instantly. Find how many kg are in a tonne, convert kg to grams and add up the total weight of several items — a fast, accurate weight converter.