# ISNUMBER function

Excel ISNUMBER Function is a simple yet powerful tool that allows you to check whether a cell contains a number or not. It returns a value of TRUE if the cell contains a number and FALSE if it doesn’t, making it a handy function for data validation and analysis.

ISNUMBER(value)

## How to use

You can use the ISNUMBER function in Excel to determine whether a cell contains a number. Here’s how you can use it:

Example 1: Checking if cell A1 contains a number.

This formula will return TRUE if cell A1 contains a number, and FALSE if it contains any other type of data, like text or empty cells.

Example 2 (Optional): Using ISNUMBER with IF function to perform an action based on whether a cell contains a number.

This formula combines ISNUMBER with the IF function to display a custom message depending on whether cell A1 contains a number or not.

Example 3 (Optional): Checking if a cell in another sheet (Sheet2!A1) contains a number.

This example demonstrates that you can use ISNUMBER to check cells in different sheets within your Excel workbook.

The ISNUMBER function is quite straightforward and can be very useful for data analysis, especially when you need to distinguish between numeric and non-numeric values in your spreadsheet. It can help you ensure data quality and make more informed decisions when working with numbers in Excel.

Tomasz Decker is an Excel specialist, skilled in data analysis and financial modeling.