Popular conversions
2 pairsDegree ↔ Radian
° ↔ rad
Degree ↔ Gradian
° ↔ gon
Unit guides
3 unitsDetailed guide to this category
Angle measures the amount of rotation between two rays sharing a common endpoint.
The radian is the SI unit of angle, while the degree is the most common practical unit for everyday and navigational use.
- Physical quantity
- Angle
- SI unit
- Radian
- Common practical unit
- Degree
- Typical use
- Trigonometry, navigation and engineering drawing
What is angle?
Angle is the amount of rotation between two rays sharing a common endpoint, measured in degrees, radians or gradians.
It is used in trigonometry, geometry, navigation and engineering.
Degrees, radians and gradians
A full circle is 360 degrees, 2π radians, or 400 gradians. The degree traces back to ancient Babylonian base-60 mathematics, while the radian is the natural SI unit for mathematical calculations.
Units
| Unit | Symbol | Information |
|---|---|---|
| Radian | rad | View unit guide |
| Degree | ° | View unit guide |
| Gradian | gon | View unit guide |
Sources
The definitions and conversion relationships on this page are aligned with standard metrology and SI reference material.