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 |
|---|---|---|
| 10 | 16.09 | 4.47 |
| 20 | 32.19 | 8.94 |
| 30 | 48.28 | 13.41 |
| 40 | 64.37 | 17.88 |
| 50 | 80.47 | 22.35 |
| 60 | 96.56 | 26.82 |
| 70 | 112.65 | 31.29 |
| 100 | 160.93 | 44.70 |
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)