ISNA Function in Excel: Is It “Not Found”?

⏱ 1 min readUpdated 28 September 2026

InformationLevel: IntermediateAvailable in: Excel 2007+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. Related functions

ISNA returns TRUE only for #N/A — the “not found” result — so you can react to missing lookups specifically.

Syntax

=ISNA(value)
Argument What it means
value Usually a lookup.

Examples

Example 1

=IF(ISNA(MATCH(A2, Master!A:A, 0)), "New customer", "Existing")

Classify records against a master list.

IFNA · ISERROR · MATCH

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