The natural logarithm of x is the base e logarithm of x:
ln x = loge x = y
The natural log calculator determines the logarithm to the base of a famous mathematical constant, e, an irrational number with an approximate value of e = 2.71828 . ... This is the power the number e has to be raised to in order to result in a given number x.
The general formula for computing Ln(x) with the Log function is Ln(x) = Log(x)/Log(e), or equivalently Ln(x) = Log(x)/0.4342944819.