Speed Converter - MPH to KPH, KM/H to Miles Per Hour

Convert speed units instantly. Miles per hour (mph) to kilometers per hour (kph), knots to mph, meters per second, mach speed converter free online.

All Speed Conversions:

🚗 Quick Reference

1 mph = 1.609 kph
1 kph = 0.621 mph
1 knot = 1.151 mph
1 m/s = 2.237 mph
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Speed Conversion Formulas

  • MPH to KPH: multiply by 1.60934
  • KPH to MPH: multiply by 0.621371
  • MPH to m/s: multiply by 0.44704
  • Knots to MPH: multiply by 1.15078
  • Mach to MPH: multiply by 767.269 (at sea level)

Common Speed Conversions

MPH KPH m/s
1016.094.47
2032.198.94
3048.2813.41
4064.3717.88
5080.4722.35
6096.5626.82
70112.6531.29
100160.9344.70

Speed Limits Around the World

  • USA: Highways 55-85 mph (88-137 kph)
  • UK: Motorways 70 mph (112 kph)
  • Germany: Autobahn - unlimited sections, recommended 130 kph (81 mph)
  • Canada: Highways 90-110 kph (56-68 mph)
  • Australia: Highways 100-130 kph (62-81 mph)

When to Use Different Speed Units

  • MPH: United States, UK road speeds
  • KPH: Most countries worldwide, metric system
  • Knots: Aviation, maritime navigation
  • m/s: Scientific calculations, physics
  • Mach: Supersonic speeds, aerospace

Interesting Speed Facts

  • Speed of sound (Mach 1) = 767 mph (1,235 kph) at sea level
  • Speed of light = 670,616,629 mph (1,079,252,849 kph)
  • Fastest car (Bugatti Chiron) = 304 mph (490 kph)
  • Average walking speed = 3-4 mph (5-6 kph)
  • Usain Bolt top speed = 27.8 mph (44.7 kph)