LN()

Syntax. LN(number)

Definition. This function returns the natural logarithm of a number. Natural logarithms are based on the constant e (2.71828182845904).

Argument

  • number (required) The positive real number for which you want the natural logarithm

Background. For the equation b = ax where a and b are known, you can calculate x by using logarithmic calculus:

x = logab

Here is another example:

2 = log3 9

As the logarithm of base a, value x is indicated with b. The logarithm system includes all logarithms with the same base. The base can be any positive number except zero and 1. The logarithm with base 2 is shortened to lb.

In natural science, Euler’s number e (2.71828182845904) is often used as a base. You can find more information on Euler’s number ...

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