# Excel LN Function

Summary

The Excel LN function returns the natural logarithm of a given number.

Purpose

Get the natural logarithm of a number

Return value

The natural logarithm

Syntax

=LN (number)

Arguments

**number**- A number to take the natural logarithm of.

Usage notes

The natural logarithm function is the equivalent to log base e of a number. Where *e* is Euler's number.

### Graph

x | ln( x) |
---|---|

0.5 | -0.69 |

1 | 0.00 |

1.5 | 0.41 |

2 | 0.69 |

2.5 | 0.92 |

3 | 1.10 |

3.5 | 1.25 |

4 | 1.39 |

4.5 | 1.50 |

5 | 1.61 |

The natural logarithm function is also the inverse of the exponential function.

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