Excel ISNUMBER Function

HomeExcel FunctionsExcel ISNUMBER Function (Example + Sample File)


The Excel ISNUMBER Function is listed under Microsoft Excel's Information Functions category. It returns TRUE if the value supplied (or the value in the cell referred) is a number. In simple words, it only considers the numeric value and ignores the rest.

How to use it

To learn how to use the ISNUMBER function in Excel, you need to understand its syntax and arguments:




  • value: A numeric value that you want to check.


  • Numbers that are enclosed in double quotation marks will be treated as text.


To master the ISNUMBER function we need to try it out in an example, so make sure to check out the below one:

In the below example, we have used ISNUMBER with IF to deliver an alert message if a user enters a non-number value in cell F1.

Related functions

This tutorial is the part of our Excel Functions with Examples (Function Guide) and below are some of the related functions:

About the Author

Puneet Gogia

Puneet is using Excel since his college days. He helped thousands of people to understand the power of the spreadsheets and learn Microsoft Excel. You can find him online, tweeting about Excel, on a running track, or sometimes hiking up a mountain.