The number argument can be any valid numeric expression greater than 0.

The natural logarithm is the logarithm to the base e. The constant e is approximately 2.718282.

You can calculate base-n logarithms for any number x by dividing the natural logarithm of x by the natural logarithm of n as follows:

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Logn(x) = Log(x) / Log(n)

The following example illustrates a custom Function that calculates base-10 logarithms:

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Function Log10(X) Log10 = Log(X) / Log(10) End Function

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Reference

Concepts