Meters per second (m/s) is the SI base unit for speed and velocity, representing the distance in meters traveled during one second. It is the standard unit in physics, engineering, and scientific research, used to describe everything from falling objects to fluid flow rates. One meter per second equals exactly 3.6 kilometers per hour or approximately 2.237 miles per hour.

Kilometers per hour (km/h) is the most common speed unit outside the United States, displayed on speedometers and road signs across Europe, Asia, and most of the world. Highway speed limits, weather reports for wind speeds, and vehicle performance figures in these regions all use km/h. One kilometer per hour equals approximately 0.2778 meters per second or about 0.6214 miles per hour.