Free online speed converter. Convert miles per hour to kilometers per hour, meters per second, knots, Mach number, and more — instant results with visual chart and conversion history.
MPH • km/h • m/s • Knots • Mach
Instantly know what km/h speed limits mean in mph when driving in Canada, Mexico, or Europe.
Convert between knots, mph, and km/h for flight planning, sailing, and marine navigation.
Convert treadmill speeds (mph) to pace (min/km), track speeds, and cycling velocities.
Speed conversion is needed constantly by Americans driving in Canada or Mexico (km/h speed limits), following international motorsports, buying imported cars with km/h speedometers, or working in aviation and maritime where knots are the standard. The core conversion: 1 mph = 1.60934 km/h. So 60 mph = 96.56 km/h. Speed limit 100 km/h = 62.1 mph. Highway 120 km/h = 74.6 mph.
Knots are used in aviation and maritime because 1 knot = 1 nautical mile per hour, which is 1 minute of arc of latitude — making navigation calculations clean. 1 knot = 1.15078 mph = 1.852 km/h. Commercial aircraft cruise at about 550 mph = 885 km/h = 478 knots. Mach 1 (speed of sound at sea level, 15°C) = 767 mph = 1,235 km/h = 667 knots.
US: 65–75 mph = 105–121 km/h. Canada: 100–110 km/h = 62–68 mph. Germany Autobahn: no limit but 130 km/h advisory = 81 mph. School zone: 25 mph = 40 km/h.
Commercial cruise: 550 mph = 885 km/h = Mach 0.85. Concorde: Mach 2 = 1,354 mph. Speed of sound (Mach 1): 767 mph = 1,235 km/h at sea level. Slow landing: ~150 mph = 241 km/h.
Cargo ship: 14–20 knots = 16–23 mph. Cruise ship: 21–24 knots = 24–28 mph. Navy destroyer: 35+ knots = 40+ mph. Speedboat: 60 knots = 69 mph.
Walking: 3 mph = 4.8 km/h. Jogging: 6 mph = 9.7 km/h. Running: 10 mph = 16 km/h. Cycling: 15 mph = 24 km/h. Usain Bolt top: 27.8 mph = 44.7 km/h.
Speed conversions matter most where units cross borders: road signs, aviation and marine navigation each settled on a different convention. The knot is the interesting one — it is one nautical mile per hour, and the nautical mile was defined as one minute of latitude along a meridian, which is why it survives in navigation despite being metric-hostile. Since 1929 it has been fixed at exactly 1,852 metres. The everyday pairing, mph to km/h, uses the exact mile definition and so is exact to any precision you need.
metres per second = value × factor_fromresult = m/s ÷ factor_to1 mph = 0.44704 m/s · 1 km/h = 0.277778 m/s · 1 knot = 0.514444 m/swhere:
Assumptions: Mach number is not a fixed speed: sound travels at about 1,225 km/h at sea level and near 1,062 km/h in the stratosphere, so the same Mach figure is a different ground speed at altitude.
A US interstate limit rendered for a driver used to metric signage.
Result65 mph = 104.61 km/h = 56.48 knots
The rough conversion of "mph × 1.6" is accurate to within 0.04%, which is far better than speedometer tolerance — most are permitted to read several percent high and none may read low.
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