Logarithm Calculator
Compute logs in any base — 2, e, 10 or custom. Calculate logarithms in base 2, natural log (base e), base 10 or any custom base. Handles decimals and shows the exact expression. Free log calculator.
Sobre o Logarithm Calculator
Logarithms answer "what power turns the base into this number?" — the reverse of exponentiation and the backbone of pH values, decibels, earthquake magnitudes, algorithm complexity and compound growth. Enter a number and choose base 2, e (natural log), 10 (common log) or a custom base; the calculator returns the result to high precision and shows which expression it evaluated, so you can verify it against a textbook answer.
Como usar o Logarithm Calculator
- Enter the number (must be positive).
- Choose the logarithm base.
- Read the result and the expression shown.
- Switch bases to compare values.
Principais recursos
- Base 2, natural (e) and common (base 10) logs
- Any custom base you need
- High-precision results
- Shows the evaluated expression
Why can’t I take the log of zero or a negative number?
What is the change-of-base rule?
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