Natural logarithm
Natural logarithm: use positive number. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
ln(x) = log base e of x
Variables & units
- Positive number
- Numeric value · minimum 5e-324, maximum 1000000000000
Worked example
ln(e) = 1.
Assumptions
The real logarithm requires a positive argument.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
Calculated on your device. Your latest 100 calculations stay in this browser.