The Excel ISNUMBER Function


Basic Description

The Excel Isnumber function tests if a supplied value is a number. If so, the function returns TRUE; Otherwise it returns FALSE.

The syntax of the function is:

ISNUMBER( value )

Where the supplied 'value' argument can be supplied directly, or can be a value returned from a formula, or a reference to a cell containing a value.


Isnumber Function Examples

The spreadsheets below show examples of the Excel Isnumber function. The spreadsheet on the left shows the formulas used, and the spreadsheet on the right shows the results:

 Formulas:
 AB
1=ISNUMBER( 1 ) 
2=ISNUMBER( "text" ) 
3=ISNUMBER( 10/2 ) 
4=ISNUMBER( B4 )#VALUE!
5=ISNUMBER( B5 )10
6=ISNUMBER( B6 ) 
 Results:
 AB
1TRUE 
2FALSE 
3TRUE 
4FALSE#VALUE!
5TRUE10
6FALSE