Degree to Radian
Convert ° to rad instantly — free, no sign-up.
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About the Degree (°)
The Degree is the everyday unit for angles, dividing a full circle into 360 parts — a convention that traces back to ancient Babylonian base-60 mathematics.
About the Radian (rad)
The Radian is the SI unit of angle, defined so a full circle equals 2π radians — the natural unit for calculus and most programming math functions (Math.sin, Math.cos, etc.).
How to convert ° to rad
- Enter the value in ° in the box above.
- The rad equivalent updates instantly.
- Use the swap button to convert rad back to ° just as easily.