Enter a value in radian per second (rad/s) in the "From" field, and the equivalent value in speed of light (c) will be displayed in the "To" field automatically.

The conversion factor between radian per second and speed of light is calculated automatically based on their relationship to the base unit in the speed / velocity category.

Yes, you can convert between any units in the speed / velocity category. Use the dropdown menus to select different units.