log
Logarithm Calculator (log, ln, log₂, custom base)
Compute logarithms in base 10, e (natural), 2, or any custom base. Plus antilog and the change-of-base formula.
MATHCompute logarithms in base 10, e (natural), 2, or any custom base. Plus antilog and the change-of-base formula.
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
Disclaimer: Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
Logarithm Calculator
Compute logarithms in any base. Change-of-base formula: log_b(x) = ln(x) / ln(b).
log₁₀ (1000)
3.000000
ln (natural)6.907755
log₂9.965784
log_103.000000
Frequently Asked Questions
What is the Logarithm Calculator (log, ln, log₂, custom base) for?
Compute logarithms in base 10, e (natural), 2, or any custom base. Plus antilog and the change-of-base formula.
How do I use the Logarithm Calculator (log, ln, log₂, custom base)?
Detailed instructions, formula notes, and US-context guidance shown in the calculator above.
How accurate are my logarithm (log, ln, log₂, custom base) results?
Estimate only. Consult a qualified professional for decisions with major financial, legal, or health consequences.
Is the Logarithm Calculator (log, ln, log₂, custom base) free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.