Natural Log Calculator

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Logarithms are the functions which are written as numbers which consist a base for that number to produce a

real number. Natural logarithms are logarithms of a number with a fixed base, ‘e’. Natural logarithms are

generally expressed as ‘lnx’ or ‘logex’. Natural log calculator is the fun tool which can give the natural log

value of any number.



Example 1: Evaluate the value of the natural log of the expression ln(18) given ln(2)= 0.693 and

ln(3)= 1.098.



Given -> ln(2)= 0.693 and ln(3)= 1.098

In order to find the value of ln(18), we have to split into pieces.

ln(18) = ln(2 * 9)

Applying the rule-> ln(a * b) = ln(a) + ln(b)

ln(2 * 9) = ln(2) + ln(9)-> ln(2) + ln(32)

Applying the rule-> ln(am) = m * ln(a)

ln(2) + ln(9) = ln(2) + 2ln(3)

ln(18) = 0.693 + (2 * 1.098)

l(18)= 2.889



Example 2: Solve for ‘x’ the given natural log equation: ln(x + 15) = 3


Given equation: ln(x + 15) = 3

The above equation contains the natural logarithm; hence its base is ‘e’.

Applying the formula -> lne(a) = x -> a = ex

Hence -> (x + 15) = e3

The value of e3 = 20.085

Hence  x + 15 = 20.085

Now subtract 15 on both sides -> x + 15 – 15 = 20.085 – 15-> 5.085

Hence the value of ‘x’ = 5.085



 

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