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.
How to Use the Degree / Radian Converter
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Frequently Asked Questions
180 degrees in radians?
π (≈3.14159) exactly — the tool shows π-forms (π/2, 3π/4) alongside decimals. Calculus wants radians; geometry wants degrees.
Why do modes matter?
sin(30°) = 0.5 but sin(30 rad) = −0.988 — same digits, different universes. Convert inputs before computing, not after.
Common conversions?
90°=π/2, 180°=π, 270°=3π/2, 360°=2π — memorized landmarks that make estimates instant.
Do angle values upload?
No — math runs locally in your browser. Numbers never leave your device.
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Last updated October 2026