﻿ LN function

# LN function

This article describes the formula syntax and usage of the LNfunction in Microsoft Excel.

## Description

Returns the natural logarithm of a number. Natural logarithms are based on the constant e (2.71828182845904).

## Syntax

LN(number)

The LN function syntax has the following arguments:

• Number    Required. The positive real number for which you want the natural logarithm.

## Remark

LN is the inverse of the EXP function.

## Example

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

How do I copy an example?

Important   Do not select the row or column headers.

Selecting an example from Help

2. Press CTRL+C.

3. In Excel, create a blank workbook or worksheet.

4. In the worksheet, select cell A1, and press CTRL+V.

Important   For the example to work properly, you must paste it into cell A1 of the worksheet.

5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

After you copy the example to a blank worksheet, you can adapt it to suit your needs.

 1 2 3 4
 A B Formula Description (Result) =LN(86) Natural logarithm of 86 (4.454347) =LN(2.7182818) Natural logarithm of the value of the constant e (1) =LN(EXP(3)) Natural logarithm of e raised to the power of 3 (3)

Applies To: Excel 2010, Excel Starter, Excel Online, SharePoint Online

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