Convert Millimeter/Second (mm/s) to Kilometer/Second (km/s) instantly.
About these units
Millimeter/Second (mm/s)
A millimeter per second is a useful speed in robotics, precision machining, biomechanics, and controlled engineering systems. Robotic arms performing delicate manipulation, small servo motors, and scanning instruments often operate in the mm/s speed range. In seismology, mm/s measures the vibration velocities of the ground during micro tremors, making it essential in structural engineering and earthquake monitoring. It reflects the world of fine-scale, controlled motion—beyond what the human eye typically detects.
Kilometer/Second (km/s)
A kilometer per second represents a very high speed—1,000 meters every second—and is particularly important in astronomy, planetary science, and astrophysics. Orbital velocities around planets, escape velocities, solar winds, and the motion of stars relative to each other are commonly measured in km/s. This scale captures speeds far beyond terrestrial transportation. For example, Earth orbits the Sun at roughly 30 km/s, and meteoroids entering Earth's atmosphere may arrive at speeds between 11 and 72 km/s. km/s is a natural step up from m/s when describing the motion of celestial bodies.