To find the nth root of a number, raise that number to the power of 1/n. For example, to find the cube root of 8 in a cell, type the following:
=8^(1/3)
Formula for nth Root in Excel
The following is the general form of the equation
=num^(1/n)
where "num" is the number you want to find the root of and "n" is the
root.