Speed Converter
0.621372
1 Kilometers per Hour (km/h) = 0.621372 Miles per Hour (mph)
All Conversions
Meters per Second (m/s)0.277778
Kilometers per Hour (km/h)1
Miles per Hour (mph)0.621372
Feet per Second (ft/s)0.911345
Knot (kn)0.539958
Mach (at sea level)8.098e-4
How to Convert Speed Units
Speed conversion is needed when driving in different countries, understanding weather reports, or working with scientific data. The most common conversion is between kilometers per hour and miles per hour.
Key Conversions
1 km/h equals approximately 0.621 mph. For maritime and aviation, speed is measured in knots: 1 knot equals about 1.151 mph or 1.852 km/h.
Frequently Asked Questions
How do I convert km/h to mph?
Multiply km/h by 0.621371 to get mph. For example, 100 km/h ≈ 62.14 mph.
What is a knot?
A knot is one nautical mile per hour, equal to about 1.151 mph or 1.852 km/h, used in maritime and aviation.