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# GAMMA function

This article describes the formula syntax and usage of the GAMMA function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) in Microsoft Excel.

## Description

Return the gamma function value.

## Syntax

GAMMA(number)

The GAMMA function syntax has the following arguments.

**Number**Required. Returns a number.

## Remarks

- GAMMA uses the following equation:

- Г(N+1) = N * Г(N)
- If Number is a negative integer or 0, GAMMA returns the #NUM! error value.
- If Number contains characters that are not valid, GAMMA returns the #VALUE! error value.

## Example

The workbook below shows examples of this function. Inspect them, change existing formulas, or enter your own formulas to learn how the function works.

To work more in-depth with the example data in Excel, download the embedded workbook to your computer, and then open it in Excel.

Applies to:

Excel 2013, Excel Online