How to Use the ISNUMBER Function in Excel

Today, we’ll discuss the ISNUMBER function, a versatile tool available in both Microsoft Excel and Google Sheets. This function is instrumental in determining whether a given value is numeric. We will cover how to utilize this function effectively in both applications.

Excel:

In Excel, the ISNUMBER function evaluates whether a specific value is numeric, returning TRUE for numbers and FALSE for non-numeric values.

The syntax for the ISNUMBER function is as follows:

ISNUMBER(value)

Here, value represents the cell reference or value that you wish to test.

Consider the following examples to better understand how the ISNUMBER function operates in Excel:

Value ISNUMBER Result
123 =ISNUMBER(123)
ABC =ISNUMBER(“ABC”)

In the first example, =ISNUMBER(123) correctly returns TRUE, indicating that 123 is indeed a number. Conversely, =ISNUMBER("ABC") in the second example returns FALSE, as “ABC” is not a numeric value.

Google Sheets:

In Google Sheets, ISNUMBER functions similarly, returning TRUE for numbers and FALSE for non-numeric values.

The syntax for ISNUMBER in Google Sheets mirrors that of Excel:

ISNUMBER(value)

Check out these examples in Google Sheets:

Value ISNUMBER Result
456 =ISNUMBER(456)
XYZ =ISNUMBER(“XYZ”)

Here, =ISNUMBER(456) returns TRUE, affirming that 456 is a number, while =ISNUMBER("XYZ") returns FALSE, verifying that “XYZ” is not a number.

The ISNUMBER function is incredibly useful for confirming the numeric nature of values in both Excel and Google Sheets. It is especially beneficial in tasks such as data validation, applying conditional formatting rules, or filtering datasets based on numerical conditions.

More information: https://support.microsoft.com/en-us/office/is-functions-0f2d7971-6019-40a0-a171-f2d869135665

Other functions
Returns information about the formatting, location, or contents of a cell
Returns a number corresponding to an error type
Returns information about the current operating environment
Returns TRUE if the value is blank
Returns TRUE if the value is any error value except #N/A
Returns TRUE if the value is any error value
Returns TRUE if the number is even
Returns TRUE if there is a reference to a cell that contains a formula
Returns TRUE if the value is a logical value
Returns TRUE if the value is the #N/A error value
Returns TRUE if the value is not text
Returns TRUE if the number is odd
Returns TRUE if the value is a reference
Returns TRUE if the value is text
Returns a value converted to a number
Returns the error value #N/A
Returns the sheet number of the referenced sheet
Returns the number of sheets in a reference
Returns a number indicating the data type of a value