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Ln Purpose Returns the base-e (natural) logarithm of a number. Format Ln(number) Parameters number - any numeric expression or field containing a numeric expression Data type returned number Originated in FileMaker Pro 6.0 or earlier Description Number can be any positive value. Negative values and 0 return an error. The Exp function is the inverse of the Ln function. Examples Ln(2.7182818) returns .99999998.... Ln(Exp(5)) returns 5. Related topics Functions reference (category list) Functions reference (alphabetical list) About formulas About functions Defining calculation fields Using operators in formulas