Evaluate mathematical expressions with sin, cos, tan, log, and sqrt functions. A versatile scientific calculator in your browser. No signup or account required.
Content reviewed October 2026 · About Toolzum
Compute trigonometry: sin, cos, tan in degrees or radians with triangle solving. Find the opposite side from 30° hypotenuse 10 (= 5) — free, local, no signup.
Evaluate arithmetic algebra expressions with + − × ÷, parentheses and decimals — digits-only evaluator, no variables. Check homework before class — free, local, no signup.
Compute logarithms (logs) in any base with change-of-base steps and natural/common presets. Solve log₂(32) = 5 instantly — free, local, no signup.
Parse cron expressions into human-readable descriptions. Includes common presets for quick reference. Presets plus plain-English schedules prevent 3am surprises — local parsing, free, no signup.
Analyze log files — error grouping, level counts, time clustering. Find the 3am spike cause in minutes — local parsing, free, no signup.
Trig, logs, powers, roots, and constants — the full scientific set.
Both modes, switchable — wrong mode is the classic error source.
Full nesting supported with proper precedence throughout.
No — calculation runs locally in your browser, free with no signup.
Exactly 0.5 — the classic check that degree mode is on. In radian mode the same input reads sin(0.524) ≈ 0.5; mismatched modes explain most wrong answers.
Algebra Calculator
Evaluate arithmetic algebra expressions with + − × ÷, parentheses and decimals — digits-only evaluator, no variables. Check homework before class — free, local, no signup.
Trigonometry Calculator
Compute trigonometry: sin, cos, tan in degrees or radians with triangle solving. Find the opposite side from 30° hypotenuse 10 (= 5) — free, local, no signup.
Logarithm Calculator
Compute logarithms (logs) in any base with change-of-base steps and natural/common presets. Solve log₂(32) = 5 instantly — free, local, no signup.