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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

Frequently Asked Questions

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