Unit Converters
Angle Converter
Convert between degrees, radians, and gradians.
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Degree (°)
1
Radian (rad)
0.017453
Gradian (gon)
1.111111
Arcminute (′)
60
Arcsecond (″)
3,600
Turn / revolution
0.002778
About the Angle Converter
Convert angles free — degrees to radians, radians to degrees, plus gradians, arcminutes, arcseconds, and full turns. Enter a value and see every unit instantly (180° = π radians; a right angle = 100 gradians). A quick reference for trigonometry, calculus, CAD, surveying, and game development.
How to use the Angle Converter
- 1Enter a value.
- 2Pick the unit to convert from.
- 3Read every other unit and copy.
Frequently asked questions
How many radians in 180 degrees?
π radians (about 3.14159).
What is a gradian?
A gradian (gon) is 1/400 of a turn, so a right angle is 100 gradians.
How do I convert degrees to radians?
Multiply degrees by π/180. So 90° = π/2 ≈ 1.5708 radians.