About this calculator
Enter any number.
How to use it
- Enter the number.
- Read the root and simplified form.
The formula
∛n = a∛b, where a³ is the largest cube factor of n
- perfect cube
- a whole number whose cube root is whole
Worked example
∛54
- 54 = 27 × 2.
- ∛54 = 3∛2 ≈ 3.780.
What the result means
Cube roots are used for volumes: a cube of 1,000 litres (1 m³) has 1 m sides.
Assumptions
- Real numbers.
Limitations
- None.
Frequently asked questions
What is the cube root of 1000?
10.
Can a negative number have a cube root?
Yes: ∛−8 = −2.
How do I simplify ∛16?
16 = 8 × 2, so ∛16 = 2∛2.
Last reviewed on 3 October 2026. Found a mistake? Tell us.