Use this free Cube Root Calculator to find the cube root of any number instantly. Enter a number to see the result automatically, including for negative numbers and decimals.
Enter a Number
Enter any positive number, negative number, or decimal. The cube root is calculated automatically.
Result
Formula: The cube root of a number x is written as ∛x. Unlike square roots, cube roots can be calculated for negative real numbers.
How to Calculate a Cube Root
A cube root tells you which number, multiplied by itself three times, gives the original number. For example, the cube root of 729 is 9 because 9 × 9 × 9 = 729.
Enter any number in the calculator above to find its cube root instantly. It also works with negative numbers, such as the cube root of -27, which is -3.
Cube Root Formula
The cube root of a number (x) is written as ∛x. If (a × a × a = x), then ∛x = a.
For example, ∛125 = 5 because 5 × 5 × 5 = 125.
| Number | Cube Root |
| -1000 | -10 |
| -216 | -6 |
| -125 | -5 |
| -64 | -4 |
| -27 | -3 |
| -8 | -2 |
| -1 | -1 |
| 0 | 0 |
| 1 | 1 |
| 8 | 2 |
| 27 | 3 |
| 64 | 4 |
| 125 | 5 |
| 216 | 6 |
| 343 | 7 |
| 512 | 8 |
| 729 | 9 |
| 1000 | 10 |