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WorksheetFunction.GammaLn Method (Excel)

Returns the natural logarithm of the gamma function, Γ(x).

Important note Important

This function has been replaced with one or more new functions that may provide improved accuracy and whose names better reflect their usage. This function is still available for compatibility with earlier versions of Excel. However, if backward compatibility is not required, you should consider using the new functions from now on, because they more accurately describe their functionality.

For more information about the new function, see the GammaLn_Precise method.

expression .GammaLn(Arg1)

expression A variable that represents a WorksheetFunction object.




Data Type





X - the value for which you want to calculate GAMMALN.

Return Value


  • If x is nonnumeric, GAMMALN returns the #VALUE! error value.

  • If x ≤ 0, GAMMALN returns the #NUM! error value.

  • The number e raised to the GAMMALN(i) power, where i is an integer, returns the same result as (i - 1)!.

  • GAMMALN is calculated as follows: Ff835306.awfgamm1_ZA06051143(en-us,office.14).gifwhere: Ff835306.awfgamm2_ZA06051144(en-us,office.14).gif

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