How to Use the ISNUMBER Function in Excel (Check If a Cell Is a Number)

How to Use the ISNUMBER Function in Excel (Check If a Cell Is a Number)

The ISNUMBER function checks whether a cell contains a number and returns TRUE or FALSE. It’s very useful for data validation and cleaning tasks.

🧩 Syntax:

=ISNUMBER(value)

📌 Parameters:

• value: The cell or expression you want to test

💡 Example:

=ISNUMBER(A1)
If A1 contains 123, it returns: TRUE
If A1 contains "Hello", it returns: FALSE

🔁 Use Cases:

• Testing whether a formula returns a number
• Combining with IF to filter numeric values
• Validating numeric inputs in forms
• Working with functions like SEARCH or VALUE

🧠 Bonus Tip:

Use with SEARCH or FIND to detect if text exists:

=IF(ISNUMBER(SEARCH("apple", A1)), "Found", "Not Found")

ISNUMBER simplifies logic-based formulas in your Excel workflows.

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