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ISNA function in Excel

Returns TRUE if the value is the #N/A error value

=ISNA(value)

ISNA syntax and parameters

One argument, one required.

  • valueanyRequired

    The value that you want tested. The value argument can be a blank (empty cell), error, logical value, text, number, or reference value, or a name referring to any of these.

ISNA examples

Formulas you'll actually reuse.

  1. Only a missing match should count as new — other errors stay visible:

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

    Result"New customer"

  2. How many lookups came back #N/A:

    =SUMPRODUCT(--ISNA(F2:F200))

    Result4

ISNA in Google Sheets

Same name — your formula ports as-is.

Try ISNA in the playground

Edit the example — nothing to install.

Preloaded with the ISNA formula from Example 1 — change anything and watch it respond.

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Related functions

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