Natural Log (ln) Calculator
Enter a positive number to find its natural logarithm, ln(x), which uses base e.
ln(x)
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How it works
ln(x) = log_e(x), e ≈ 2.71828Frequently Asked Questions
What is the natural log?
It is the logarithm to base e (about 2.71828), written ln(x). It appears throughout growth, decay and calculus.
Can I enter 0 or a negative number?
No. The natural log is only defined for positive numbers.