Speed Conversion Reference
Convert velocity and speed measurements instantly: Meters per Second (m/s), Kilometers per Hour (km/h), Miles per Hour (mph), Knots, Feet per Second, and Mach.
Speed Converter
Velocity & Speed Conversion Guide
Speed and velocity measurements calculate distance traveled per unit of time. Across automotive engineering, international travel, maritime navigation, aviation, and athletic sports science, converting between miles per hour (mph), kilometers per hour (km/h), knots, and meters per second (m/s) ensures accurate speed compliance and travel estimation.
Common Velocity Multipliers
- 1 Mile per Hour (mph) = 1.60934 km/h = 0.868976 Knots = 0.44704 m/s
- 1 Kilometer per Hour (km/h) = 0.621371 mph = 0.539957 Knots = 0.277778 m/s
- 1 Knot (nautical mile/hr) = 1.15078 mph = 1.852 km/h = 0.514444 m/s
Frequently Asked Questions (FAQs)
Q: How do I convert mph to km/h?
A: Multiply miles per hour by 1.60934.
Q: What is a knot?
A: A knot is a unit of speed equal to one nautical mile per hour (1.852 km/h), used in maritime navigation and aviation.
Speed & Velocity Conversion Complete Reference
Speed measurements calculate distance traveled per unit time. The SI base unit for speed is meters per second (m/s), while everyday applications use miles per hour (mph) in the US and UK, and kilometers per hour (km/h) in most metric countries. Aviation and maritime navigation use knots (nautical miles per hour).
Speed Conversion Reference Table
| Source | mph | km/h | Knots | m/s |
|---|---|---|---|---|
| 1 mph | 1.000 | 1.60934 | 0.86898 | 0.44704 |
| 1 km/h | 0.62137 | 1.000 | 0.53996 | 0.27778 |
| 1 Knot | 1.15078 | 1.852 | 1.000 | 0.51444 |
| 1 m/s | 2.23694 | 3.6 | 1.94384 | 1.000 |
Real-World Speed Reference Points
- Walking pace: 5 km/h = 3.1 mph
- UK motorway limit: 70 mph = 112.7 km/h
- Commercial aircraft cruise: 900 km/h = 559 mph = 486 knots
- Speed of sound (sea level, 20°C): 343 m/s = 1,235 km/h = 767 mph