ISNUMBER Function in Excel

This post will guide you how to use ISNUMBER function with syntax and examples in Microsoft excel.


The Excel ISNUMBER function returns TRUE if the value in a cell is a numeric value, otherwise it will return FALSE.

so you can use ISNUMBER function to check if a cell contains a numeric value or check the result of another function is a number in excel formula.

The ISNUMBER function is a build-in function in Microsoft Excel and it is categorized as an Information Function.

The ISNUMBER function is available in Excel 2016, Excel 2013, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000,  Excel 2011 for Mac.


The syntax of the ISNUMBER function is as below:

= ISNUMBER (value)

Where the ISNUMBER function argument is:
Value -This is a required argument. The value that you want to test.

ISNUMBER Function Examples

The below examples will show you how to use Excel ISNUMBER Function to test if a cell contains a numeric value, if so, return TRUE.

Example 1: check the value in cell B1 if it is a numeric value.

ISNUMBER Function Examples1

#1 = ISNUMBER (B1)

It will return FALSE.


It will return TRUE.






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