Author: Oscar Cronquist Article last updated on April 17, 2018

The ISNUMBER function checks if a value is a number, returns TRUE or FALSE.

Formula in cell D3:


Excel Function Syntax



value Required. The value you want to check if it is a number.


The ISNUMBER function is really useful sometimes because it returns FALSE from error values as well. Most Excel functions return an error if they are fed with an error.