Logarithm calculator

Client

Answer “what power raises base to value?”—handy for log homework, decibel-style ratios, and algorithm complexity checks.

About Logarithm calculator

Compute log_b(x) for any valid base and value—natural, base-10, or custom—in your browser. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

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Nearby workflows on Toolcore

  • Scientific notation converter — Convert between decimal and scientific notation strings—parse and format in your browser. when units or numeric output should be checked on a related calculator.
  • Math expression evaluator — Evaluate basic + − × ÷ arithmetic with parentheses in your browser—no variables. when units or numeric output should be checked on a related calculator.
  • Nth root calculator — Compute x^(1/n)—cube roots and higher real roots, including odd roots of negatives, locally. when units or numeric output should be checked on a related calculator.
  • Power of two checker — Test whether a whole number equals 2^k—bit-friendly sizes, computed in your browser. when units or numeric output should be checked on a related calculator.

Common use cases

  • Convert between log bases for algebra or pre-calculus exercises.
  • Estimate log₂ n for binary search / tree depth intuition.

Common mistakes to avoid

  • Log of zero or negatives

    Real logarithms require a positive value.

FAQ

Is this natural log?

You choose the base—use e≈2.718 for ln, 10 for common log.

Precision?

Results use double-precision floats; trailing zeros are trimmed.

More tools

Related utilities you can open in another tab—mostly client-side.