Cube Root Calculator
Find the cube root of any positive or negative number instantly with this free cube root calculator that runs in your browser.
Enter Values
How to use this calculator
- Enter a number.
- Read its cube root.
How it works
The cube root of x is the value that, multiplied by itself three times, gives x. Negatives have a real cube root (−27 → −3).
Worked example
27. Cube root = 3, because 3 × 3 × 3 = 27.
Common mistakes
- Confusing cube root with square root — cube root undoes a power of 3.
- Assuming negatives have no root — they do (unlike square roots).
Frequently asked questions
How do I calculate a cube root?
The cube root of x is the number that, cubed, gives x: ∛27 = 3 because 3 × 3 × 3 = 27.
Can a cube root be negative?
Yes — unlike square roots, cube roots of negative numbers are real: ∛(−8) = −2.
Can you cube-root a negative number?
Yes — the cube root of a negative is negative, e.g. −27 → −3.
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Cite this tool
Zerdly. (2026). Cube Root Calculator. Retrieved from https://www.zerdly.com/tools/cube-root-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.