LOG10

The LOG10 function returns the logarithm base 10 of a number.

LOG10( number )

The number argument can be any valid numeric expression that has a value greater than 0. You can calculate base-n logarithms for any number x by dividing the logarithm base 10 of x by the logarithm base 10 of n as follows:

LOGN( x ) = LOG10( x ) / LOG10( n )