Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, and 2016. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Finding the Nth Root of a Number.

Finding the Nth Root of a Number

by Allen Wyatt
(last updated June 11, 2016)

4

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 whiz (and I am not), the answer may not be that obvious. All you need to do 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)

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (12350) applies to Microsoft Excel 2007, 2010, 2013, and 2016. You can find a version of this tip for the older menu interface of Excel here: Finding the Nth Root of a Number.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He  is president of Sharon Parq Associates, a computer and publishing services company. ...

MORE FROM ALLEN

Inserting Cells in a Table

You can enlarge a table by adding cells where they are needed. Just pick where you want the cells inserted, then use the ...

Discover More

Arranging Workbook Windows

If you find yourself working with a number of different workbooks at the same time, you may want to arrange your desktop so ...

Discover More

Quickly Copying Styles

You can easily use regular editing techniques to copy styles from one document to another. Here's how to make quick work of ...

Discover More

Solve Real Business Problems Master business modeling and analysis techniques with Excel and transform data into bottom-line results. This hands-on, scenario-focused guide shows you how to use the latest Excel tools to integrate data from multiple tables. Check out Microsoft Excel 2013 Data Analysis and Business Modeling today!

More ExcelTips (ribbon)

Random Numbers in a Range

Excel provides several different functions that you can use to generate random numbers. One of the most useful is the ...

Discover More

Phantom Counts

Two common worksheet functions used to count things are COUNT and COUNTA. Not understanding how these functions treat cell ...

Discover More

Making PROPER Skip Certain Words

The PROPER worksheet function is used to change the case of text so that only the first letter of each word is uppercase. ...

Discover More
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

View most recent newsletter.

Comments

If you would like to add an image to your comment (not an avatar, but an image to help in making the point of your comment), include the characters [{fig}] in your comment text. You’ll be prompted to upload your image when you submit the comment. Maximum image size is 6Mpixels. Images larger than 600px wide or 1000px tall will be reduced. Up to three images may be included in a comment. All images are subject to review. Commenting privileges may be curtailed if inappropriate images are posted.

What is four less than 9?

2017-09-25 10:20:04

Ronald Finnerty

this did not answer the finding nth root question. It merely shows how nth root calculation work.
If I have a number and need to find the nth root of base 2 of the number i am no further along with your solution.
i only know the answer is 2^1/n so how do i find n?


2017-06-20 09:22:53

Dennis Costello

Just to be pedantic, I'll point out that Maarten is almost correct. He said:
2^-1 for instance is 0.5 (2/2^1)
2^-3 is 0.125 (2/2^3)
When he meant
2^-1 for instance is 0.5 (1 / 2^1)
2^-3 is 0.125 (1 / 2^3)


2016-06-30 17:20:39

Maarten Daams

You can even use negative exponents.
2^-1 for instance is 0.5 (2/2^1)
2^-3 is 0.125 (2/2^3)
etc.
And so on.
Of course fractional negative exponents work also, but that is more complicated


2016-06-11 06:08:43

Polarisking

The POWER function also works here,

POWER(B7,1/5)


This Site

Got a version of Excel that uses the ribbon interface (Excel 2007 or later)? This site is for you! If you use an earlier version of Excel, visit our ExcelTips site focusing on the menu interface.

Newest Tips
Subscribe

FREE SERVICE: Get tips like this every week in ExcelTips, a free productivity newsletter. Enter your address and click "Subscribe."

(Your e-mail address is not shared with anyone, ever.)

View the most recent newsletter.