# Log Function

Returns the natural logarithm of a number.

## Syntax:

## Return values:

Double

## Parameter

Number: Any numeric expression that you want to calculate the natural logarithm for.

The natural logarithm is the logarithm to the base e. Base e is a constant with an approximate value of 2.718282...

You can calculate logarithms to any base (n) for any number (x) by dividing the natural logarithm of x by the natural logarithm of n, as follows:

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

## Example:

```
Sub ExampleLogExp
Dim a As Double
Dim Const b1=12.345e12
Dim Const b2=1.345e34
a=Exp( Log(b1)+Log(b2) )
MsgBox "" & a & chr(13) & (b1*b2) ,0,"Multiplication by logarithm function"
End Sub
```