Math Calculators

Top10k's math category has 285 free calculators that run in your browser: arithmetic, algebra, geometry, trigonometry, and statistics, with no sign-up and nothing to install. Type your numbers, read the answer, and move on.

Common picks: the Percentage Calculator works out percent of a number, percent change, and what-percent-of-what. The Fraction Calculator adds, subtracts, multiplies, and divides fractions and reduces the result to lowest terms. The Quadratic Formula Calculator solves ax² + bx + c = 0 and reports both roots, whether real or complex. For data work, the Standard Deviation Calculator returns the mean, variance, and population or sample standard deviation, while the Prime Factorization Calculator breaks any integer down into its prime factors.

Every calculator runs client-side, so the numbers you type never leave your device. That suits homework, lab data, or a quick check at work, and there is no usage limit and no account to create. Need unit conversions or money math instead? See Unit Converters, Statistics Tools, and Finance Tools.