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.

The knot (kn) equals one nautical mile per hour or approximately 1.852 kilometers per hour, the universal speed unit for maritime and aviation navigation. Ship speeds, aircraft velocities, and wind speeds in meteorological reports all use knots as their standard measurement. One knot equals exactly 1.15078 miles per hour, reflecting the longer nautical mile compared to the statute mile.