Convert degrees and radians both ways with π-exact forms — 180° = π rad. Stop mixing modes in calculus — free, local, no signup.
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.
Compute circle area and circumference from the radius — geometry homework solved. Enter r=5 and read both measures at once — free, local, no signup.
Convert decimals to exact fractions — 0.75 to 3/4 with repeating-decimal support. Get exact answers for homework — free, local, no signup.
Convert between Roman numerals and numbers both ways — chapters, clocks, movie credits. Decode MCMXCIV as 1994 instantly — local math, free, no signup.
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π (≈3.14159) exactly — the tool shows π-forms (π/2, 3π/4) alongside decimals. Calculus wants radians; geometry wants degrees.
sin(30°) = 0.5 but sin(30 rad) = −0.988 — same digits, different universes. Convert inputs before computing, not after.
90°=π/2, 180°=π, 270°=3π/2, 360°=2π — memorized landmarks that make estimates instant.
No — math runs locally in your browser. Numbers never leave your device.
Last updated October 2026