Rotation: Calculate Distance and Speed

The distance covered is calculated as twice the radius times the number of revolutions times the number π, i.e. number of revolutions times circumference.

Example: if a body with radius one meter makes one revolution in one second, then it has a speed of 22.62 kilometers per hour, makes 60 revolutions per minute and covers 6.28 meters in that second.

Rotation is when something moves in a circular path around an axis. The tires on vehicles rotate, as do the rotors on helicopters and airplanes, which even get their name from this movement. Planets, on the other hand, are not said to rotate, as they do not orbit their central star in circular orbits, but in elliptical orbits.
In the uniform rotation with which this calculator works, each revolution lasts the same length of time, and accordingly the same number of revolutions or fractions thereof are completed in each period of time. The speed in length per time refers to the point on the rotating object at which the radius was measured. If you go further inwards, the speed decreases, and further outwards it increases. This is in contrast to the rotation speed, which is not measured in length, but in revolutions per time, and which is the same for every point on the rotating body, as long as it is not pulled or torn apart by the rotation.

Physics commonly uses SI units. Here is a calculator to convert units.