ISERR Function in Excel: Any Error Except #N/A

⏱ 1 min readUpdated 28 September 2026

InformationLevel: IntermediateAvailable in: Excel 2007+

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

ISERR is TRUE for every error except #N/A. That lets you treat “not found” as normal while still catching real breakages like #DIV/0! or #REF!.

Syntax

=ISERR(value)
Argument What it means
value Usually a formula.

Examples

Example 1

=IF(ISERR(C2), "Check formula", C2)

Leaves #N/A visible, flags other errors.

ISERROR · ISNA · IFNA

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