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Tips.Net > ExcelTips Home > Worksheet Functions > Math and Trig Functions > Finding the Nth Root of a Number

Finding the Nth Root of a Number

Summary: Figuring out square roots is easy, but how do you figure out third, fourth, fifth, or any number of other roots? While Excel doesn’t provide built-in worksheet functions to handle this, you can use a simple formula to figure out the desired result. (This tip works with Microsoft Excel 97, Excel 2000, Excel 2002, and Excel 2003.)

You may be wondering how to use Excel to derive different roots of a number. Finding a square root is easy: you just use the SQRT function. For instance, the following returns the square root of the value in cell B7:

=SQRT(B7)

What about different roots, however? What if you want the fifth root of the value in B7, instead of the square root? Unless you are a math wiz (and I am not), the answer may not be that obvious. All you need to so is raise the value to the power of 1/n. For instance, if you want that fifth root of B7, then you would use the following formula:

=B7^(1/5)

Tip #2172 applies to Microsoft Excel versions: 97 | 2000 | 2002 | 2003


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