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MS Excel: ISNA Function (WS)

Learn how to use the Excel ISNA function with syntax and examples.


The Microsoft Excel ISNA function can be used to check for a #N/A (value not available) error.


The syntax for the Microsoft Excel ISNA function is:

ISNA( value )

Parameters or Arguments

value is the value that you want to test. If value is a #N/A error value , this function will return TRUE. Otherwise, it will return FALSE.

Applies To

The ISNA function can be used in the following versions of Microsoft Excel:

  • Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

Type of Excel Function

The ISNA function can be used in Microsoft Excel as the following type of function:

  • Worksheet function (WS)

Example (as Worksheet Function)

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

Microsoft Excel

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

=ISNA(A1) would return FALSE
=ISNA(A2) would return TRUE
=ISNA(A3) would return FALSE
=ISNA(A4) would return FALSE
=ISNA("") would return FALSE
=ISNA(3/0) would return FALSE