LN Function in Excel: Natural Logarithm

⏱ 1 min readUpdated 28 September 2026

MathLevel: ExpertAvailable in: Excel 2007+

In this article
  1. Syntax
  2. Examples
  3. Example 1
  4. Related functions

LN is the logarithm with base e. Finance uses it for continuously compounded (log) returns.

Syntax

=LN(number)
Argument What it means
number Positive.

Examples

Example 1

=LN(C3/C2)

Daily log return of a price series.

EXP · LOG

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