Excel LOG Function
In this Article
This Excel Tutorial demonstrates how to use the Excel LOG Function in Excel to calculate the logarithm of a number to a specified base, with formula examples.
LOG Function Description:
The LOG Function Calculates the logarithm of a number to a specified base.
Syntax and Arguments:
The Syntax for the LOG Formula is:
Function Arguments ( Inputs ):
number – A number.
base – OPTIONAL. The base of the logarithm. Blank as default.
Use the LOG Function to calculate the logarithm of a number to a specified base. Simply enter any number directly into the formula, or reference a cell containing a number.
LOG Examples in VBA
You can also use the LOG function in VBA. Type:
For the function arguments (number, etc.), you can either enter them directly into the function, or define variables to use instead.
Return to the List of all Functions in Excel
How to use the LOG Function in Excel:
To use the AND Excel Worksheet Function, type the following into a cell:
After entering it in the cell, notice how the AND formula inputs appear below the cell:
You will need to enter these inputs into the function. The function inputs are covered in more detail in the next section. However, if you ever need more help with the function, after typing “=LOG(” into a cell, without leaving the cell, use the shortcut CTRL + A (A for Arguments) to open the “Insert Function Dialog Box” for detailed instructions:
For more information about the LOG Formula visit the