Cube Root Calculator

Calculate the cube root

The cube root of a number is the value that, when multiplied by itself three times, gives that number. The cube root of sixty-four is four because four cubed is sixty-four. Unlike the square root, the cube root is defined for negative numbers as well, since a negative times a negative times a negative is negative, so the cube root of minus twenty-seven is minus three. This calculator finds the cube root of any real number and tells you whether it is a perfect cube.

A verification line cubes the result so you can confirm it reproduces your original number, within normal floating-point precision.

Cube roots in practice

Cube roots arise whenever you reverse a cubing operation. In geometry they give the side length of a cube from its volume. In science they appear in scaling laws that relate volume to length, and in finance they help find an average growth rate over three periods. Students meet cube roots alongside square roots when learning about powers and radicals.

Because the browser computes the cube root with a dedicated function, negative inputs are handled correctly and return real negative roots rather than errors. For roots of other degrees, a general nth-root calculator extends the same idea. All calculation runs locally in your browser.

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