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.

Miles per hour (mph) is the standard speed unit in the United States, United Kingdom, and a few other countries, used for speed limits, vehicle speedometers, and weather forecasts. American road signs exclusively display speed limits in mph, and car enthusiasts commonly reference 0-60 mph times as a performance benchmark. One mile per hour equals exactly 1.60934 kilometers per hour.