Excel ISNA Function
If you want to follow along with this tutorial, please download the example spreadsheet.
Description
The Excel ISNA function tests if a value or expression returns Excel #N/A error. If so, it returns TRUE, otherwise, returns FALSE.
Syntax and arguments
Formula syntax
Arguments
|
Return Value
The ISNA function returns a logical value TRUE or FALSE.
Version
Excel 2003 and later versions
Usage and Examples
Example1: Basic Usage
To check if the cells in range B4:B8 contain #N/A error, you can use the ISFORMULA function as below:
Select a cell to place the checking result, and type the formula as this:
=ISNA(B4)
Press Enter key, and then drag the auto-fill handle down to get all results. 
Example2: Combine with IF function
The ISNA function is usually combined with the IF function to return a custom message when the cell contains a #N/A error.:
Supposing in range B12:B16 contains name list 1, then using the VLOOKUP function to find if the names in D12:D15 are in the name list 1, the names do not exist in name list 1 will return #N/A errors. Then change the #N/A error to a custom message such as None. You can use the ISNA function as this:
=IF(ISNA(E12),"None",E12)
Press Enter key, and then drag the auto-fill handle down to get all results. 
Relative Functions:
-
Excel ISODD Function
The ISODD function checks whether a value is an odd number. If the given value is an odd number, it returns TRUE. Otherwise, it returns FALSE.
-
Excel ISEER Function
The ISERR function returns TRUE for any error type (except #N/A) and FALSE otherwise.
-
Excel ISEVEN Function
The Excel ISEVEN function tests if a supplied number (or numeric expression) is even, if so, it returns TRUE, otherwise, it returns FALSE.
-
Excel ISREF Function
The ISREF function checks whether a given value is a reference. If the given value is a reference, it returns TRUE. Otherwise, it returns FALSE.
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