Last updated
Speed Unit Conversion Table
mph km/h m/s knots ft/s Mach
------ ------ ------ ------ ------ ------
1 1.609 0.447 0.869 1.467 0.0013
10 16.09 4.470 8.690 14.67 0.013
30 48.28 13.41 26.07 44.00 0.039
60 96.56 26.82 52.14 88.00 0.079
70 112.7 31.29 60.83 102.7 0.092
80 128.7 35.76 69.52 117.3 0.105
100 160.9 44.70 86.90 146.7 0.131
120 193.1 53.64 104.3 176.0 0.157
186 299.3 83.13 160.6 273.1 0.244
Conversion Formulas
mph to km/h: multiply by 1.60934
km/h to mph: multiply by 0.62137
m/s to km/h: multiply by 3.6
km/h to m/s: divide by 3.6
knots to km/h: multiply by 1.852
km/h to knots: divide by 1.852
mph to knots: multiply by 0.86898
m/s to mph: multiply by 2.23694
Examples
Example 1: Road Speed Conversions
Common speed limits:
30 mph = 48.3 km/h (residential area, US)
50 km/h = 31.1 mph (urban area, Europe)
60 mph = 96.6 km/h (rural road, US)
100 km/h = 62.1 mph (highway, Europe)
70 mph = 112.7 km/h (highway, US/UK)
130 km/h = 80.8 mph (autobahn, Germany)
Example 2: Aviation and Maritime
1 knot = 1 nautical mile per hour = 1.852 km/h = 1.151 mph
Common aviation speeds:
Typical cruising speed (commercial jet): 900 km/h = 560 mph = 486 knots
Speed of sound (Mach 1): 343 m/s = 1235 km/h = 767 mph = 667 knots
Mach 2: 686 m/s = 2470 km/h = 1535 mph = 1334 knots
Common maritime speeds:
Cargo ship: 15 knots = 27.8 km/h = 17.3 mph
Container ship: 25 knots = 46.3 km/h = 28.8 mph
Fast ferry: 40 knots = 74.1 km/h = 46.0 mph
Example 3: Physics Reference Values
Speed of light (c):
299,792,458 m/s = 1,079,252,849 km/h = 670,616,629 mph
Speed of sound (at sea level, 20°C):
343 m/s = 1235 km/h = 767 mph = 1125 ft/s = Mach 1
Earth's orbital speed around the Sun:
29,783 m/s = 107,218 km/h = 66,627 mph
International Space Station orbital speed:
7,660 m/s = 27,576 km/h = 17,130 mph = Mach 22.3