Natural Log (ln) Calculator
Use the Natural Log to work through natural Log from the values you enter. Review the method below the result when you want to check your work.
ln(x)
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How it works
ln(x) = log_e(x), e ≈ 2.71828How to use the Natural Log
Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.
Review the assumptions on the page and confirm any result that affects money, safety, technical work or another important decision.
Frequently 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.
Can I use the result as an exact answer?
Treat it as an estimate or check unless the page and the rules that apply to you confirm otherwise. Rounding, fees and personal details can change the final result.