LOG - Excel - Microsoft Office Online

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LOG

Applies to: Microsoft Office Excel 2003

Returns the logarithm of a number to the base you specify.

Syntax

LOG(number,base)

Number is the positive real number for which you want the logarithm.

Base is the base of the logarithm. If base is omitted, it is assumed to be 10.

Example

The example may be easier to understand if you copy it to a blank worksheet.

Show How to copy an example

Create a blank workbook or worksheet.
Select the example in the Help topic.
Note Do not select the row or column headers.

Selecting an example from Help
Press CTRL+C.
In the worksheet, select cell A1, and press CTRL+V.
To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

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A	B
Formula	Description (Result)
=LOG(10)	Logarithm of 10 (1)
=LOG(8, 2)	Logarithm of 8 with base 2 (3)
=LOG(86, 2.7182818)	Logarithm of 86 with base e (4.454347)