Cube roots vs square roots
Unlike square roots, cube roots accept negative inputs because multiplying three negatives yields a negative. Volume problems often invert into cube roots: a 1000 cm³ cube has edges of ∛1000 = 10 cm.
Cube Root Calculator
Compute ∛ for positive and negative numbers — cube roots of negatives are valid real numbers.
Enter your details and press Calculate to see results.
Formula
∛x is the number y where y³ = x
Example
∛27 = 3 because 3 × 3 × 3 = 27. ∛(−27) = −3 because (−3)³ = −27.
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Frequently asked questions
What is ∛64?
4, since 4³ = 64.
How do I cube root on a basic calculator?
Use the exponent key with 1/3: enter the number, press x^y, type (1 ÷ 3) and equals.
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