Logarithm Calculator
Formula
ln(x) = natural logarithm
The natural logarithm (ln) uses base e (≈2.718). Log base 10 is the common logarithm. ln(100) ≈ 4.605, log₁₀(100) = 2.
Frequently Asked Questions
What is ln?
ln is the natural logarithm — the inverse of e^x. ln(e) = 1.
What is log base 10?
log₁₀ answers: '10 to what power equals this number?' log₁₀(100) = 2 because 10² = 100.