Calculate the cube root of a number, including negative numbers.
Input
Cube Root
∛x3.000000
Check (result³)27.000000
About this calculator
Cube Roots
The cube root of a number x is a number y such that y³ = x. Unlike square roots, cube roots are defined for all real numbers, including negative ones (e.g., ∛-8 = -2).
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Pro Tips
The cube root of a positive number is positive.
The cube root of a negative number is negative.
Perfect cubes: 1, 8, 27, 64, 125...
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Fun Facts
"The problem of 'Doubling the Cube' (constructing a cube with twice the volume of a given cube using only a compass and straightedge) was proven impossible in 1837."
