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 mathematical expressions with sin, cos, tan, log, and sqrt functions. A versatile scientific calculator in your browser. No signup or account required.
Convert degrees and radians both ways with π-exact forms — 180° = π rad. Stop mixing modes in calculus — 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.
Compute trial-to-paid conversion across visitor, signup, and paid stages with MRR math — find funnel leaks. Lift 15% trials to 25% deliberately — free, local, no signup.
Compute gross margin from revenue and costs — know exact profitability. A $30 sale at $20 cost margins 33% — free, local, no signup.
Both — degrees for geometry homework, radians for calculus. Mode toggle sits beside inputs; wrong-mode answers are the classic error.
Yes — side-angle-side and angle-side combos solve fully with remaining sides and angles. SOH-CAH-TOA under the hood.
arcsin/arccos/arctan return angles from ratios — range limits respected (arcsin beyond ±1 is undefined).
No — math runs locally in your browser. Numbers never leave your device.
sin = cos = 0.707107, tan = cot = 1.000000, csc = sec = 1.414214 — six functions to 6 places with a CSV download. Flip the toggle to radians before entering calculus-style angles; 45 radians looks nothing like 45 degrees.
Degree / Radian Converter
Convert degrees and radians both ways with π-exact forms — 180° = π rad. Stop mixing modes in calculus — free, local, no signup.
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.
Last updated October 2026