Excel Functions

Excel LOG Function

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The LOG function returns the logarithm of a given number, using a supplied base. The base argument defaults to 10 if not supplied.

Purpose of Excel LOG Function

Get the logarithm of a number.

Return value

The logarithm.

Syntax

=LOG (number,[base])

Arguments

ArgumentsDescriptionRemarks
numberThe number for which you want the logarithm.Mandatory
[base]Base of the logarithm. Defaults to 10.Optional

Usage notes

  • This function allows you to get the logarithm of a number with a specified base.

Availability

Since 2007 for Windows.
Since 2011 for Mac.

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