Free online calculators for math, finance, and taxes — plus 10 math games with global leaderboards. Simple, fast, and accurate.
Free basic online calculator. Add, subtract, multiply, and divide with ease. Simple and fast.
Free online engineering calculator with sin, cos, tan, log, ln, powers, roots, factorials, memory and more. Supports DEG/RAD mode.
Calculate the square root of any number instantly. Free online square root (√) calculator.
Calculate squares (x²), cubes (x³), and any power (xⁿ). Includes a perfect squares table from 1 to 20. Free online square calculator.
Calculate factorial (n!) instantly. Includes a factorial table from 0! to 20!. Free online factorial calculator.
Find the nth Fibonacci number or list the Fibonacci sequence. Free online Fibonacci sequence calculator.
Calculate the area of circles, rectangles, triangles, trapezoids, and parallelograms. Free online area calculator with formulas.
Calculate the volume of cubes, cuboids, spheres, cylinders, and cones. Free online volume calculator with formulas.