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\<bookmark_value\>Log function\</bookmark_value\>

# Log Function

Returns the natural logarithm of a number.

## Syntax:

    Log (Number)

## Return value:

Double

## Parameters:

\<emph\>Number:\</emph\> 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)

## Error codes:

5 Invalid procedure call

## 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