# GAMMA function

## Description

GAMMA(x) returns the Gamma function of x.

When the argument n is an integer, the gamma function is similar to the factorial function, offset by one. Gamma(n) is defined as:

When x is a real number Gamma(x) is defined by the integral:

The argument n must be higher than 0.

If n is larger than 171.62, the function overflows and returns an error. For large arguments the GammaLn function can be used.

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## See also

- GAMMALN function: returns the logarithm of the Gamma function.
- Gamma function and related functions

## External links

- Gamma function on Wikipedia.