# Excel ISNUMBER function

## Summary

The Excel ISNUMBER function checks if a cell contains a numeric value. This function is essential for validating data, performing conditional formatting, and preparing data for analysis by ensuring that operations expecting numeric inputs are indeed working with numbers. ISNUMBER can help distinguish between numeric and non-numeric data, enabling users to apply logic based on the data type.
##### Syntax
```				```
=ISNUMBER(value)
```
```
• value: The cell reference or expression you want to test for numeric content
##### Return value
• TRUE if the specified cell or expression contains a numeric value
• FALSE if it contains any other type of data, including text, logical values, errors, or is empty

## How to use

ISNUMBER is straightforward to use: just provide the cell reference or value you wish to test. It’s commonly used in combination with IF to execute conditional logic depending on whether a cell contains numeric data.

## Examples

##### Simple ISNUMBER
Checking for Numeric Values in a Cell: To verify if a cell, such as A1, contains a numeric value.
```				```
=ISNUMBER(A1)

```
```
If A1 contains a number, this formula returns TRUE, indicating that the cell holds a numeric value. If A1 contains text, an error, a logical value, or is empty, it returns FALSE.
##### ISNUMBER with Conditional Logic
Implementing Conditional Formatting Based on Data Type: Using ISNUMBER within an IF statement to display messages or perform calculations based on the presence of numeric data.
```				```
=IF(ISNUMBER(A1), "Numeric data detected", "Non-numeric data")
```
```
This formula checks if A1 is numeric and returns “Numeric data detected” if true; otherwise, it indicates “Non-numeric data”, helping users to quickly understand the nature of the data in A1.
##### ISNUMBER in Data Validation
Validating Data Entries for Numeric Content: To ensure that inputs in a data collection process are numeric.
```				```
=ISNUMBER(B2:B100)

```
```
Applying ISNUMBER across a range can assist in scenarios where numeric data entry is required, by identifying cells that do not comply with this requirement, thereby aiding in data consistency and validation.