Pi radians
Input: 3.14159265 rad
Output: 180°
π × 180/π = 180 degrees.
radians to degrees converter
Use this to turn an angle in radians back into degrees.
Degrees:
Formula and algorithm
- degrees = radians × 180 / π
- π ≈ 3.14159265358979; 2π radians is a full 360° circle.
- Multiply the radian value by 180/π ≈ 57.29578 to get degrees.
Worked examples
One radian
Input: 1 rad
Output: 57.2958°
1 × 180/π = 57.2958 degrees.
Half pi
Input: 1.57079633 rad
Output: 90°
π/2 × 180/π = 90 degrees.
FAQ
What is 1 radian in degrees?
About 57.2958 degrees.
How many degrees is 2π radians?
Exactly 360 degrees — one full circle.
When do I need this?
When a library returns an angle in radians (e.g. atan2) and you want degrees.
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Updated: June 7, 2026