totn Excel Functions

MS Excel: How to use the ISNUMBER Function (WS)

This Excel tutorial explains how to use the Excel ISNUMBER function with syntax and examples.

Description

The Microsoft Excel ISNUMBER function can be used to check for a numeric value.

The ISNUMBER function is a built-in function in Excel that is categorized as an Information Function. It can be used as a worksheet function (WS) in Excel. As a worksheet function, the ISNUMBER function can be entered as part of a formula in a cell of a worksheet.

Syntax

The syntax for the ISNUMBER function in Microsoft Excel is:

ISNUMBER( value )

Parameters or Arguments

value
The value that you want to test. If value is a numeric value , this function will return TRUE. Otherwise, it will return FALSE.

Returns

The ISNUMBER function returns TRUE if the value is a valid number.
The ISNUMBER function returns FALSE if the value is not a valid number.

Applies To

  • Excel for Office 365, Excel 2019, Excel 2016, Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

Type of Function

  • Worksheet function (WS)

Example (as Worksheet Function)

Let's look at some Excel ISNUMBER function examples and explore how to use the ISNUMBER function as a worksheet function in Microsoft Excel:

Microsoft Excel

Based on the Excel spreadsheet above, the following ISNUMBER examples would return:

=ISNUMBER(A1)
Result: TRUE

=ISNUMBER(A2)
Result: TRUE

=ISNUMBER(A3)
Result: TRUE

=ISNUMBER(A4)
Result: FALSE

=ISNUMBER(5)
Result: TRUE

=ISNUMBER("5")
Result: FALSE