Cube Root Calculator
Last updated: November 5, 2026
Calculate the real cube root, cube, nearest integer and verification value.
Real cube root
—
- Cube of the result: —
- Nearest integer: —
- Difference from nearest perfect cube: —
On this page
Quick summary: Calculate the real cube root, cube, nearest integer and verification value.
Read the complete guide
Updated reference sections in this guide are in English.
What this calculator estimates
Calculate the real cube root, cube, nearest integer and verification value.
How to use it
Enter Number. Select Calculate to update the results.
How the calculation works
The real cube root is the number that produces the input when multiplied by itself three times.
Worked example: starting scenario
| Number | 125 |
|---|
| Real cube root | 5 |
|---|---|
| Cube of the result | 125 |
| Nearest integer | 5 |
| Difference from nearest perfect cube | 0 |
Important limitations
For values that are not perfect cubes, the decimal result is rounded for display.
A real root for negative numbers
The real cube root preserves sign: ∛(−125) = −5 because (−5)³ = −125. Cubing the displayed root reconstructs the input up to floating-point rounding. The nearest-integer root and its cube difference are separate approximations; they do not establish that a number is a perfect cube when the exact root is fractional.