ISNA Google Sheet Formula

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ISNA Formula Syntax

=ISNA(VLOOKUP("Item", A1:B10, 2, FALSE))

Example Use Case

Checking if a value is the #N/A error

Understanding the ISNA Formula

The ISNA function in Excel checks whether a value is specifically the #N/A error, returning TRUE if it is and FALSE otherwise. It's a targeted error detection tool for lookup operations—like handling not-found situations in VLOOKUP or other lookup functions.

ISNA(VLOOKUP("Item", A1:B10, 2, FALSE)) returns TRUE if the VLOOKUP operation results in #N/A (value not found), otherwise FALSE. It takes a single value argument and tests specifically for the #N/A error—perfect for creating graceful fallbacks for lookup functions.

Why Use ISNA?

ISNA enables specific #N/A detection—think lookup error handling or data availability checks. Its focused approach makes it ideal for scenarios where #N/A has a specific meaning (usually "not found") rather than indicating a formula error, allowing you to respond appropriately.

Example with Sample Data

Value	Formula	Result
#N/A	=ISNA(#N/A)	TRUE
#DIV/0!	=ISNA(#DIV/0!)	FALSE
"Not Found"	=ISNA("Not Found")	FALSE
NA() function	=ISNA(NA())	TRUE

ISNA targets #N/A specifically: TRUE only for #N/A errors, FALSE for all other values including other error types. Use with IF like =IF(ISNA(VLOOKUP(...)), "Not found", VLOOKUP(...)) to handle lookups gracefully. It's an #N/A detector.