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Excel LN Function

Excel LN function

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

Get the natural logarithm of a number
Return value 
The natural logarithm
=LN (number)
  • 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.

= LN( number) = LOG( number, e) // Where e ≈ 2.7128 or EXP(1)


Graph of the natural logarithm.

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.

= number = LN( EXP(number))

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