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The **natural logarithm** of a number is its logarithm to the base *e*, it is used to calculate the natural logarithm of a number x, where * e* is an irrational and transcendental constant approximately equal to 2.718281828, which is generally written as ln(x) or log_{e}(x) or log(*x*).

For instance, Ln^{7} = 1.94591, e^{1.94591} = 7, So The natural logarithm of *x* is the power to which *e* would have to be raised to equal *x*. So Ln^{e} = 1.

When you want to calculate a group of numbers of natural logarithm, Enter "2 4 5 6" click the "calculate" button, The result will be "0.693147 1.386294 1.609438 1.791759".

Natural Logarithm: Ln(6) = 1.791759

Natural Logarithm: Ln(5) = 1.609438

Natural Logarithm: Ln(4) = 1.386294

Natural Logarithm: Ln(2) = 0.693147

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