ISNUMBER Google Sheet Formula

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ISNUMBER Formula Syntax

=ISNUMBER(A1)

Example Use Case

Checking if a value is a number

Understanding the ISNUMBER Formula

The ISNUMBER function in Excel checks whether a value is a number, returning TRUE if it is and FALSE if it's not. It's a data type validation tool for numerical operations—like ensuring inputs to calculations are actually numbers to prevent errors.

ISNUMBER(A1) evaluates cell A1 and returns TRUE if it contains a number, including dates (which Excel stores as serial numbers). It takes a single value argument and performs a number type check—useful for validating numerical data or creating formulas that adapt based on input type.

Why Use ISNUMBER?

ISNUMBER enables numerical detection—think data validation or selective calculations. Its ability to identify numbers specifically helps create robust formulas that avoid operating on text or other non-numerical data that would cause errors in mathematical functions.

Example with Sample Data

Value	Formula	Result
123	=ISNUMBER(123)	TRUE
"123" (text)	=ISNUMBER("123")	FALSE
3/15/2023 (date)	=ISNUMBER(DATE(2023,3,15))	TRUE
TRUE (logical)	=ISNUMBER(TRUE)	FALSE

ISNUMBER identifies numeric values: TRUE for whole numbers, decimals, and dates; FALSE for text, logical values, errors, or empty cells. When combined with IF, it can help create calculations that only process numerical inputs. It's a number detector.