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VBA Log Function

Written by

Editorial Team

Reviewed by

Steve Rynearson

Last updated on July 19, 2021

Log Description

Returns the natural logarithm of a number.

Simple Log Examples

Sub Abs_Example()
    MsgBox Log(100)
End Sub

This code will return 4.60517018598809

Log Syntax

In the VBA Editor, you can type  “Log(” to see the syntax for the Log Function:

The Log function contains an argument:

Number: Any valid numeric expression greater than zero.

Examples of Excel VBA Log Function

MsgBox Log(10)

Result: 2.30258509299405

MsgBox Log(32)

Result: 3.46573590279973

All the above examples are cases with the base e(the base of the natural logarithm).

To calculate the logarithm with any base, you can use the code as following function.

Function LogAny(b As Double, x As Double) As Double
    ' b: base x: a given number
    LogAny = Log(x) / Log(b)
End Function

Sub Log_Example1()
    MsgBox LogAny(10, 100)
End Sub

The result will be as following.

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