Radians (rad) - Angle Conversions
A radian is a unit of angular measure in the International System of Units (SI). The symbol for radian is rad. A radian is equal to the angle subtended at the center of a circle by an arc of length equal to the radius of the circle. A radian is equal to 180°/π or 57.29577951 degrees.
Select a Conversion
Select one of the radian conversions below:
Unit Summary
This table provides a summary of the Angle units within their respective measurement systems.
| Unit | Symbol | Measurement System |
|---|---|---|
| degrees | deg or ° | Non-SI (International) |
| radians | rad | International System of Units (SI) |
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