Logarithm Calculator
Free log, ln, custom base, and antilog calculator. Instant results, no sign-up.
Compute log (base 10), ln (base e), custom base, and antilog in one tool.
Result
log₁₀(100)
2
About the logarithm calculator
Free logarithm calculator with modes for common log (base 10), natural log (ln), any custom base, and antilog. Enter your values for instant results—no sign-up required.
- log₁₀ (base 10) and ln (base e)
- Custom base: log_b(x) for any base b
- Antilog: compute base^exponent
- Copy result and reset
Use cases
- Algebra and calculus
- Scientific and engineering math
- Decibel and ratio calculations
For unit conversion (e.g. dB, ratios), use the Logarithmic converter.
Added Mar 4, 2026
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