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Cube Root Calculator
Find the cube root of any number, positive or negative.
Cube root
—
∛ of the number.
| Square root | — |
|---|---|
| Cubed back | — |
| Number | — |
| — |
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Enter your figures above to see the step-by-step working.
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How the Cube Root Calculator Works
The cube root of a number is the value that, multiplied by itself three times, gives that number. The cube root of 27 is 3, because 3 × 3 × 3 = 27. Unlike square roots, cube roots work for negative numbers too — the cube root of −8 is −2.
Cube roots come up whenever you go from a volume back to a length — the side of a cube from its volume, for example.
cube root of x = the number n where n³ = x
Frequently Asked Questions
What is the cube root of 27?
3, because 3³ = 27.
Can you take the cube root of a negative number?
Yes — the cube root of −8 is −2, since (−2)³ = −8.
What is a cube root used for?
Finding a length from a volume, and solving cubic equations and scaling problems.
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