Logarithm calculator
Solve log_b(x) = y for any missing value, and see ln, log₂ and log₁₀ at a glance.
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What is a logarithm?
The logarithm answers “what power do I raise the base to, to get this number?” log₁₀(1000) = 3 because 10³ = 1000.
How do I change the base?
log_b(x) = ln(x) ÷ ln(b). Any base works on both sides, as long as it is the same one.