Excel ISNUMBER Function

Logic Function ยท Beginner Level

What is ISNUMBER?

Returns TRUE if the value is a number. Essential for data validation and error prevention.

Syntax

=ISNUMBER(value)

Example

Formula: =ISNUMBER(A1)

Result: TRUE or FALSE

How It Works

Returns TRUE for numbers (including dates/times), FALSE for text, errors, or blanks. Key for validation.

Learn More Excel Functions