Cube Root Calculator
Compute ∛n. Negative inputs are supported because cube roots of negatives are real.
Calculator
Use the Cube Root Calculator
Result
—
Formula
∛n
Step-by-step
- 1
Enter the number
Positive or negative.
- 2
Read the root
The result is the real cube root.
Worked example
Example input: n: 27
Result: 3
Related tools
- Square Root
Compute √n.
Frequently asked questions
What is the cube root of 64?
4, because 4 × 4 × 4 = 64. Cube roots run cubing backwards: ∛8 = 2 and ∛125 = 5. Enter any number above and the calculator returns the root — for perfect cubes the answer is a clean integer.
Can you take the cube root of a negative number?
Yes — cube roots handle negatives: the cube root of -27 is -3 because (-3)³ = -27. Square roots of negatives have no real value, but odd roots do. The calculator accepts a negative input and returns the negative root.
How do I check a cube root answer?
Cube it back: if the calculator says the root is about 1.71, then 1.71 × 1.71 × 1.71 ≈ 5 should equal your original input. That quick reverse step catches typos instantly and works for decimals as well as integers.