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Logarithm Calculator

Compute logs to any base, natural and common logs, antilogs and exponents — with change-of-base working shown.

Works in BrowserInstant
Common bases:
Result
Working
Same Argument, Other Bases
Logarithm Laws
Productlogₐ(xy) = logₐx + logₐy
Quotientlogₐ(x/y) = logₐx − logₐy
Powerlogₐ(xⁿ) = n·logₐx
Change of baselogₐx = ln x / ln a
Identitylogₐa = 1, logₐ1 = 0
Inversea^(logₐx) = x