Speed Converter
Convert between km/h, mph, m/s, ft/s, and knots instantly. Perfect for travel and scientific calculations.
Speed Converter
Quick Conversions
Conversion Formulas
km/h ↔ mph:
1 mph = 1.60934 km/h
1 km/h = 0.621371 mph
km/h ↔ m/s:
1 m/s = 3.6 km/h
1 km/h = 0.277778 m/s
mph ↔ m/s:
1 mph = 0.44704 m/s
1 m/s = 2.23694 mph
Speed Reference
| Object/Limit | km/h | mph | m/s |
|---|---|---|---|
| Walking | 5 km/h | 3.1 mph | 1.4 m/s |
| Running | 20 km/h | 12.4 mph | 5.6 m/s |
| City Limit | 50 km/h | 31 mph | 13.9 m/s |
| Highway | 120 km/h | 75 mph | 33.3 m/s |
| Speed of Sound | 1,235 km/h | 767 mph | 343 m/s |
| Commercial Jet | 900 km/h | 559 mph | 250 m/s |
Understanding Speed Units
Why Different Speed Units?
Different speed units are used around the world for various purposes. Kilometers per hour (km/h) is standard in most countries, while miles per hour (mph) is used primarily in the United States and UK.
Scientists prefer meters per second (m/s) for precision, while mariners and pilots use knots (nautical miles per hour) for navigation.
When to Use Our Speed Converter
Our free speed converter is essential for travel, sports, and scientific calculations. For other unit conversions, try our Unit Converter. If you need to convert time zones, check out our Timezone Converter.
International Travel
Convert speed limits between mph and km/h when driving in different countries or planning road trips.
Sports & Fitness
Convert running speeds, cycling velocities, and athletic performance metrics between different units.
Scientific Research
Convert velocities for physics experiments, engineering calculations, and scientific measurements.
Aviation & Maritime
Convert speeds between knots, mph, and km/h for navigation, flight planning, and maritime operations.
Education & Learning
Help students understand speed conversions, unit relationships, and metric vs imperial systems.
Vehicle Performance
Convert vehicle speeds for comparing performance specs, speedometer readings, and technical documentation.
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