Cube Root Calculator
Calculate the cube root of a number.
The number that cubes to yours
A cube root is the value that, multiplied by itself three times, gives the number — the cube root of 27 is 3, because 3 times 3 times 3 is 27. This calculates cube roots, including for numbers that do not come out neat.
Enter a number to find its cube root.
Cube roots and the geometry of volume
The cube root undoes cubing, just as the square root undoes squaring, and it has a natural geometric meaning: if you know the volume of a cube, the cube root gives the length of its side. This makes cube roots the tool for going from a volume back to a linear dimension, which connects to why volume scales so dramatically with size. Unlike square roots, cube roots work for negative numbers too, since a negative cubed stays negative, so every real number has a real cube root. As with any root, most cube roots are irrational decimals that never end, so the answer is usually an approximation of an exact value. Cube roots come up in geometry, in scaling problems, and anywhere a cubed relationship needs reversing.
Cube Root Calculator FAQ
What is a cube root?
The number that, multiplied by itself three times, gives your number — the cube root of 27 is 3, since 3 times 3 times 3 is 27.
Can you take the cube root of a negative number?
Yes — unlike square roots, cube roots work for negatives, since a negative number cubed stays negative, so every real number has a real cube root.
Is anything uploaded?
No. The calculation happens in your browser.