This post will guide you how to use** Excel ****LN function** with syntax and examples in Microsoft excel.

### Description

The Excel LN function returns the natural logarithm of a given number. And the natural logarithms are based on the constant e (the value is equal to 2.718281828…).

The LN function is a build-in function in Microsoft Excel and it is categorized as a Math and Trigonometry Function.

The LN function is available in Excel 2016, Excel 2013, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000, Excel 2011 for Mac.

### Syntax

The syntax of the LN function is as below:

= LN (number)

Where the LN function arguments is:

**number**– This is a required argument. The number that you want the logarithm. And the number must be a positive real number.

** Note:**

- If either the supplied number argument is negative or zero, the LN function will return #NUM! Error.
- If the number argument is non-numeric, the LN function will return #VALUE! Error.
- LN is the inverse of the Exp function.

### Excel LN Function Examples

The below examples will show you how to use Excel LN Function to calculate the natural logarithm of a given number.

**1#** to get the natural logarithm of 14, enter the following formula in Cell B1.

=LN (14)

**2#** to get the natural logarithm of the value of the constant e (2.71828), enter the following formula in Cell B2.

=LN (2.71828)

** **

**3#** to get the natural logarithm of e raised to the power 2, enter the following formula in Cell B2.

=LN (EXP(2))

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