# Manuals/calci/LN

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**LN(Number)**

- where is the any positive real number.
- LN() returns the natural logarithm of a number.

## Description

- This function gives the Natural Logarithm of a number.
- is the logarithm in which the base is the irrational number (= 2.71828...).
- For example,
- It was formely also called Hyperbolic logarithm.
- And also called Napierian logarithm.
- The constant is called Euler's number.
- The Natural Logarithm is denoted by or .
- where is the Positive real number.
- The is the inverse function of the exponential function if .

## ZOS

- The syntax is to calculate Natural logarithm in ZOS is .
- where is the any positive real number.

- For e.g.,LN(20..23)

## Examples

- =LN(15) = 2.708050201
- =LN(8.3) = 2.116255515
- =LN(1) = 0
- =LN(0) = -INFINITY
- =LN(-20) = NAN
- =LN(exp(5)) = 5
- =EXP(LN(7)) = 7

## Related Videos

## See Also

## References