Find the nth root of a number — square, cube, or any index. Enter the number and the root index.
Root
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The nth root.Usage Tip
A fractional exponent is a root: x^(1/3) is the cube root, x^(2/3) is the cube root squared.
THE MATH
nth root of x = x^(1 ÷ n)
The inverse of raising to the power n
The inverse of raising to the power n
A root undoes a power: the cube root of 27 is 3 because 3 cubed is 27.
Even roots of negative numbers are not real; odd roots are.
Even roots of negative numbers are not real; odd roots are.
Use index 2 for a square root, 3 for a cube root, and so on.
The check column raises the result back to the power n to confirm.
Even roots require a non-negative number.
The check column raises the result back to the power n to confirm.
Even roots require a non-negative number.