Reference > Functions reference > Number functions > Ln
 

Ln

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.

Example 1 

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