Convert speed units — km/h, mph, m/s, knots, Mach.
| Unit | Name | Value |
|---|---|---|
| m/s | Meter per Second | 0.44704 |
| km/h | Kilometer per Hour | 1.6093427 |
| ft/s | Foot per Second | 1.4666667 |
| kn | Knot | 0.86897699 |
| Mach | Mach | 0.001313703 |
Common mile per hour values converted to meter per second — factor: 1 mph = 0.447 m/s
| Mile per Hour (mph) | Meter per Second (m/s) | Context |
|---|---|---|
| 3 mph | 1.341 m/s | Slow walk |
| 6 mph | 2.682 m/s | Fast walk |
| 10 mph | 4.47 m/s | Slow cycle |
| 20 mph | 8.941 m/s | Fast cycle |
| 30 mph | 13.41 m/s | City road |
| 40 mph | 17.88 m/s | Rural road |
| 50 mph | 22.35 m/s | Rural road |
| 60 mph | 26.82 m/s | Motorway |
| 70 mph | 31.29 m/s | Fast motorway |
| 80 mph | 35.76 m/s | Fast motorway |
| 100 mph | 44.7 m/s | Sports car |
| 120 mph | 53.64 m/s | Sports car |
| 200 mph | 89.41 m/s | High-speed train |
| 550 mph | 245.9 m/s | Jet airliner |
| 767 mph | 342.9 m/s | Speed of sound |
Converting mile per hour to meter per second is essential for drivers, pilots, engineers, and scientists working across different measurement systems. Road speed limits, aviation airspeed, nautical navigation, and physics calculations each use different speed units, making quick and accurate conversion a practical everyday skill.
Key reference points: 5 mph = 2.235 m/s and 10 mph = 4.47 m/s. At higher speeds, 100 mph = 44.7 m/s. For reverse conversion, multiply m/s values by 2.237 to get back to mph.
All conversions use the internationally recognized factor of exactly 1 mph = 0.447 m/s. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: Meter per Second = Mile per Hour × 0.44704
Multiply any mile per hour value by 0.44704 to get meter per second. One mile per hour equals 0.44704 m/s.
Reverse: Mile per Hour = Meter per Second × 2.2369363
mph × 0.4470 = m/s. Round to × 0.447.
Memorize: 60 mph ≈ 26.8 m/s — useful for physics problems.
m/s × 2.237 = mph.
Reads road speed limits and vehicle speedometers in miles per hour.
Observes UK speed limits (20/30/60/70 mph) on British roads.
Monitors lap speeds and vehicle performance in mph at US oval tracks.
Reports hurricane and tornado wind speeds in mph for US audiences.
References historical aircraft speeds in mph from US/UK aviation records.
Measures and enforces speed limits in mph in the US and UK.
Miles per hour traces its roots to Imperial Britain, where the mile was standardized as 1,760 yards in the 18th century. The UK adopted mph for road use and exported it to its colonies, explaining why the US, UK, and a handful of other nations still use it.
The United States, United Kingdom, Liberia, and Myanmar are the primary countries still using mph for road speeds. US Interstate speed limits are typically 65-75 mph, while UK motorways are limited to 70 mph.
Interesting fact: The world's fastest production car, the Bugatti Chiron Super Sport, reaches 304 mph (490 km/h). The US air speed record stands at 2,193 mph set by the SR-71 Blackbird.
Meters per second is the SI derived unit of speed, defined as one meter of distance traveled per second. It was established when the metric system was codified by France in 1795 and became the scientific standard worldwide.
m/s is the preferred unit in physics, engineering, and scientific research. Wind speeds in meteorology, projectile velocities in ballistics, and fluid flow rates in engineering are all measured in m/s.
Interesting fact: The speed of sound in air at 20°C is approximately 343 m/s. A typical sneeze travels at about 4.5 m/s, while a cheetah can reach 28 m/s (100 km/h).