Logarithm Calculator
Free online logarithm calculator. Natural log, log base 10, custom base. Accurate and easy to use.
Base must be positive and not 1
Result
log10(100) = 2.000000
Natural log (ln)
4.605170
Log₁₀
2.000000
Antilog: 10^2.000000 = 100.000000
Rule: logₐ(b) = ln(b) / ln(a) = 4.605170 / 2.302585
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