Log
Purpose 
Returns the base-10 (common) logarithm of number.
Format 
Log(number)
Parameters 
number - any positive 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 return an error. For 0, the Log function returns nothing because this value is out of the acceptable range.
Equation
Examples 
Log(1) returns 0.
Log(100) returns 2.
Related topics 
Functions reference (category list)
Functions reference (alphabetical list)
About formulas
About functions
Defining calculation fields
Using operators in formulas
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