Speed Converter
Convert between metres per second, kilometres per hour, miles per hour, knots, feet per second and Mach. Results update as you type. Last updated: June 2026.
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Speed Reference Points
Mach number is the ratio of speed to the local speed of sound. It varies with air temperature and altitude. The value of 340.29 m/s used here is for dry air at sea level at 15°C.
Frequently Asked Questions
How many mph is 100 km/h?
100 km/h = 62.14 mph. To convert km/h to mph, multiply by 0.621371. To convert mph back to km/h, multiply by 1.60934. The typical highway speed limit of 100 km/h is just over 62 mph.
What is a knot in km/h?
1 knot = 1.852 km/h exactly. A knot is one nautical mile per hour. Nautical miles are used in maritime and aviation navigation because they relate directly to degrees of latitude on Earth's surface.
What is Mach 1 in km/h?
Mach 1 is approximately 1,235 km/h (767 mph) at sea level and 15°C. The speed of sound changes with air temperature and altitude. Commercial aircraft cruise at roughly Mach 0.85, and the Concorde flew at Mach 2.
How do I convert km/h to m/s?
Divide by 3.6. Since 1 km = 1,000 m and 1 hour = 3,600 seconds, the factor is 1,000 / 3,600 = 1/3.6. Example: 72 km/h ÷ 3.6 = 20 m/s. To go the other way, multiply m/s by 3.6.
What is 60 mph in km/h?
60 mph × 1.60934 = 96.56 km/h. A quick mental check: 60 mph is just under 100 km/h. The exact factor is 1.60934 km per mile.