Online Calculators

# Cube Root Calculator

Cube Roots Calculator
$\sqrt[3]{x} = \; ?$

## Calculator Use

Use this calculator to find the cube root of positive or negative numbers. Given a number x, the cube root of x is a number a such that a3 = x. If x positive a will be positive, if x is negative a will be negative. Cube roots is a specialized form of our common radicals calculator.

## Example Cube Roots:

• The 3rd root of 64, or 64 radical 3, or the cube root of 64 is written as $$\sqrt[3]{64} = 4$$.
• The 3rd root of -64, or -64 radical 3, or the cube root of -64 is written as $$\sqrt[3]{-64} = -4$$.
• The cube root of 8 is written as $$\sqrt[3]{8} = 2$$.
• The cube root of 10 is written as $$\sqrt[3]{10} = 2.154435$$.

The cube root of x is the same as x raised to the 1/3 power. Written as $$\sqrt[3]{x} = x^{\frac{1}{3}}$$. The common definition of the cube root of a negative number is that
(-x)1/3
= -(x1/3).[1] For example:

• The cube root of -27 is written as $$\sqrt[3]{-27} = -3$$.
• The cube root of -8 is written as $$\sqrt[3]{-8} = -2$$.
• The cube root of -64 is written as $$\sqrt[3]{-64} = -4$$.

Cube roots (for integer results 1 through 10)

• Cube root of 1 is 1
• Cube root of 8 is 2
• Cube root of 27 is 3
• Cube root of 64 is 4
• Cube root of 125 is 5
• Cube root of 216 is 6
• Cube root of 343 is 7
• Cube root of 512 is 8
• Cube root of 729 is 9
• Cube root of 1000 is 10

To calculate fractional exponents use our calculator for Fractional Exponents.

### References

[1] Weisstein, Eric W. "Cube Root." From MathWorld -- A Wolfram Web Resource. Cube Root