Calculate log₁₀, natural log (ln), log₂, or any custom base logarithm. Also computes the antilog (inverse logarithm).
The inverse of exponentiation. log₁₀(1000) = 3 because 10³ = 1000. Answers "what power gives this number?"
Uses base e ≈ 2.718. Appears in calculus, compound interest, and growth models. ln(e) = 1.
log uses base 10. ln uses base e. ln(x) = log(x) / log(e) ≈ log(x) / 0.4343.
Computer science. Gives number of bits needed to represent n values and steps in binary search.
dB = 10 × log₁₀(intensity ratio). Sound 10 times more intense is 10 dB louder.