Skip to content

How to Use Excel LN Function?

LN FunctionPin
LN Function

Excel LN Function: Excel LN function is designed to calculate the natural logarithm of a number and gives the corresponding numeric value as an output. The Natural logarithms are usually based on the constant e (2.71828182845904 is a value of e). We all know that Excel provides various formulas and functions to perform mathematical operations.

Let’s see the usage of the Excel LN Function with its syntax, description, and examples. Get an official version of MS Excel from the following link:

Excel LN FunctionPin
Excel LN Function

Description of LN Function

  • This function returns the natural logarithm of a number.
  • The natural logarithm is based on the constant “e” (2.71828182845904).
  • For example, LN(56) returns the natural logarithm number 4.025352.


  • Here, you will see the syntax of the LN function.
  • To apply this function on your spreadsheet, you have to select a cell and enter the formula in the following format.
  • Once you enter the formula, just click on the Enter button to get the result.


Parameter Description:

  • Number – The input number to which you want the natural logarithm value.

1) LN Function is the inverse of the EXP (exponential) function.
2) If you give non-numeric values such as letters and special characters to the argument, it will return #VALUE! Error.
3) If the argument is a negative number, it shows #NUM! Error.


Here, we come up with some examples to know how to use the LN function in the Excel spreadsheet.

  • Initially, you have to open your Excel workbook on your PC and launch a worksheet that has data.
  • For instance, we have given a range of values in Column B and we will get the natural logarithm of these numbers using the LN function.
Input ValuesPin
Input Values
  • Then, you have to enter the formula in the cell as shown below to get the result.
Enter the formulaPin
Enter the formula
  • After entering the formula, you need to click the Enter button to get the output, as shown below. You can drag down the cell to fill the remaining cells.

Input that Causes Error

  • If the argument is a negative number, it shows #NUM! Error.
  • If you use any non-numeric value (letters and symbols) as the input number, it returns #VALUE! Error.


In this article, you can understand the usage of the Excel LN Function with its syntax, description, and examples. Leave your suggestions in the comment section. To learn more about Excel functions, then visit our webpage

Video Tutorial

The following video will show you how to use the Excel LN function in the worksheet.

Read Also:


Leave a Reply

Your email address will not be published. Required fields are marked *

Share to...