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Speed Converter
Km/h, mph, m/s, knots, ft/s, Mach — all the speed units you'll need.
1 Kilometers / hour (km/h) =
0.6214 Miles / hour (mph)
Any Speed, Any Unit
Convert between the six most common speed units: km/h (Europe, India), mph (US, UK), m/s (physics), ft/s (engineering), knots (marine, aviation), and Mach (sea-level approximation).
Frequently Asked Questions
How many mph is 100 km/h?
100 km/h = 62.14 mph. To go the other way: 60 mph = 96.56 km/h. Rule of thumb: km/h ≈ mph × 1.6.
How fast is 1 knot?
1 knot = 1 nautical mile / hour = 1.852 km/h = 1.151 mph. Used in marine and aviation navigation.
What's Mach 1?
The speed of sound — about 343 m/s (1,235 km/h / 767 mph) at sea level at 20°C. Higher altitudes have lower Mach 1.
How do I convert m/s to km/h?
Multiply by 3.6. A 10 m/s sprint = 36 km/h. To go back, divide by 3.6.