Compute logarithms (logs) in any base with change-of-base steps and natural/common presets. Solve log₂(32) = 5 instantly — free, local, no signup.
Compute test percentages and grades from correct/total with curve options. Turn 42/50 into 84% (B) instantly — free, local, no signup.
Convert any date to its day-of-year number (1–365/366) with days remaining. Developers compute ordinal dates for logs and filenames — free, no signup, runs locally.
Compute simple probability as favorable outcomes divided by total outcomes — coin flips, dice rolls, card draws. See 3 in 10 read as 30.0% instantly — free, local, no signup.
Compute conversion rate from visitors and conversions with presets, history, and CSV export. Turn 2% into 3% deliberately — free, local, no signup.
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes from text or file input using CryptoJS. Paste text or drop files; digests compute instantly for checksums and lookups — free, local, no signup.
5 — because 2⁵ = 32. Logarithms ask 'to what power' and the tool answers with the derivation.
log_b(x) = ln(x)/ln(b) — any base computes from naturals. The steps show the division explicitly.
Positive arguments with bases ≠ 1 only — log(0) and negatives are undefined in reals. Invalid inputs explain why, not just error.
No — math runs locally in your browser. Numbers never leave your device.
Scientific Calculator
Evaluate mathematical expressions with sin, cos, tan, log, and sqrt functions. A versatile scientific calculator in your browser. No signup or account required.
Exponent Calculator
Raise any base to any power — squares, cubes, negative and fractional exponents with full precision. Students check 2^10 = 1024 homework in seconds — free, no signup, runs locally.
Last updated October 2026