# ISNUMBER

The `ISNUMBER` formula is used to check if a given value is a number. It returns TRUE if the value is a number and FALSE if it is not. This formula is commonly used in data cleaning and validation to identify and remove non-numeric values or to ensure that a cell only contains a number.

## Usage

Use the `ISNUMBER` formula with the syntax shown below, it has 1 required parameter:

Parameters:
1. value (required):
The value or reference to the cell that you want to check if it is a number.

## Examples

Here are a few example use cases that explain how to use the `ISNUMBER` formula in Google Sheets.

### Remove non-numeric values

You can use the `ISNUMBER` formula along with other formulas like `IF`, `LEN`, and `REGEXMATCH` to remove non-numeric values from a column of data. By applying this formula to each cell in the column, you can identify which cells contain non-numeric values and then replace them with a blank cell or some other value.

### Validate user input

If you have a form or a sheet that requires users to input numbers, you can use the `ISNUMBER` formula to validate their input. By applying this formula to the cell that the user inputs data into, you can check if they have entered a number or not. If they have not entered a number, you can display an error message or prompt them to enter a number.

### Calculate with only numeric values

By using the `ISNUMBER` formula along with other formulas like `SUMIF`, `AVERAGEIF`, and `COUNTIF`, you can calculate with only numeric values in a range. By applying this formula to each cell in the range, you can identify which cells contain numeric values and then use the other formulas to calculate the total, average, or count of only those cells.

## Common Mistakes

`ISNUMBER` not working? Here are some common mistakes people make when using the `ISNUMBER` Google Sheets Formula:

### Using text values in the function

The ISNUMBER function only works with numerical values. If you use text values as input, the function will always return FALSE. To correct this, make sure the input is a numerical value.

### Not enclosing the input in parentheses

The ISNUMBER function requires the input value to be enclosed in parentheses. Omitting them will result in an error. To correct this, make sure the input is enclosed in parentheses.

### Using the wrong data type for the input

The ISNUMBER function only works with numerical values. If you use non-numerical values as input, the function will always return FALSE. To correct this, make sure the input is a numerical value.

The following functions are similar to `ISNUMBER` or are often used with it in a formula:

• `ISBLANK`

The `ISBLANK` formula is used to check if a cell is empty. It returns `TRUE` if the cell is empty and `FALSE` if it contains any data or formula. This formula is commonly used in conditional formatting or data validation rules to ensure a cell is not left empty.

• `ISTEXT`

The `ISTEXT` function checks whether the value provided is a text string or not. It returns TRUE if the value is text and FALSE if it is any other data type. This function is commonly used when working with data sets that contain text and non-text values.

• `ISNONTEXT`

The `ISNONTEXT` formula is used to determine if a value is not text. It returns `TRUE` if the value is not text, and `FALSE` if the value is text. This formula is commonly used to check if a cell contains text or not.

• `IFERROR`

The `IFERROR` formula is used to check whether a specified value results in an error or not. If the value results in an error, then it returns a user-specified value instead of the error. This function is commonly used to prevent errors from breaking a formula or to replace error messages with custom messages.

• `REGEXMATCH`

The `REGEXMATCH` formula searches for a regular expression pattern within a specified text string, and returns a boolean value of TRUE if the pattern is found, and FALSE if it is not found. This formula is commonly used to check if a string matches a certain pattern or to extract specific information from a text string based on a pattern.

You can learn more about the `ISNUMBER` Google Sheets function on Google Support.