ISNUMBER Function in Excel: Is It a Real Number?

⏱ 1 min readUpdated 28 September 2026

InformationLevel: IntermediateAvailable in: Excel 2007+

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

ISNUMBER returns TRUE for numbers (and dates). Combined with SEARCH or MATCH, it turns “found / not found” into TRUE/FALSE.

Syntax

=ISNUMBER(value)
Argument What it means
value Anything.

Examples

Example 1

=ISNUMBER(A2)

FALSE exposes numbers stored as text.

Example 2

=ISNUMBER(SEARCH("gst", B2))

Does the description mention GST?

Example 3

=ISNUMBER(MATCH(A2, OtherList, 0))

Is this ID in the other list?

ISTEXT · SEARCH · MATCH

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