Convert speed units — km/h, mph, m/s, knots, mach and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 mph | 0.00146667 ft/s | |
| 0.01 mph | 0.0146667 ft/s | |
| 0.1 mph | 0.146667 ft/s | |
| 1 mph | 1.46667 ft/s | |
| 5 mph | 7.33333 ft/s | |
| 10 mph | 14.6667 ft/s | |
| 50 mph | 73.3333 ft/s | |
| 100 mph | 146.667 ft/s | |
| 1000 mph | 1466.67 ft/s |
Common mile per hour values converted to foot per second — factor: 1 mph = 1.467 ft/s
| Mile per Hour (mph) | Foot per Second (ft/s) | Context |
|---|---|---|
| 3 mph | 4.4 ft/s | Slow walk |
| 6 mph | 8.8 ft/s | Fast walk |
| 10 mph | 14.67 ft/s | Slow cycle |
| 20 mph | 29.33 ft/s | Fast cycle |
| 30 mph | 44 ft/s | City road |
| 40 mph | 58.67 ft/s | Rural road |
| 50 mph | 73.33 ft/s | Rural road |
| 60 mph | 88 ft/s | Motorway |
| 70 mph | 102.7 ft/s | Fast motorway |
| 80 mph | 117.3 ft/s | Fast motorway |
| 100 mph | 146.7 ft/s | Sports car |
| 120 mph | 176 ft/s | Sports car |
| 200 mph | 293.3 ft/s | High-speed train |
| 550 mph | 806.7 ft/s | Jet airliner |
| 767 mph | 1,125 ft/s | Speed of sound |
Converting mile per hour to foot 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 = 7.333 ft/s and 10 mph = 14.67 ft/s. At higher speeds, 100 mph = 146.7 ft/s. For reverse conversion, multiply ft/s values by 0.6818 to get back to mph.
All conversions use the internationally recognized factor of exactly 1 mph = 1.467 ft/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: Foot per Second = Mile per Hour × 1.4666667
Multiply any mile per hour value by 1.4666667 to get foot per second. One mile per hour equals 1.4666667 ft/s.
Reverse: Mile per Hour = Foot per Second × 0.68181818
mph × 1.4667 = ft/s. Round to × 1.47.
Classic anchor: 60 mph = exactly 88 ft/s. Memorize this.
ft/s × 0.6818 = 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.
Feet per second is an Imperial unit of speed equal to exactly 0.3048 m/s. It was in common use in Britain and America from the 17th century, particularly in ballistics and military applications.
ft/s remains the standard in US ballistics: bullet velocities, muzzle speeds, and arrow velocities are universally quoted in feet per second. It also appears in HVAC airflow measurements and some engineering contexts.
Interesting fact: A typical rifle bullet travels at 900-1,200 ft/s (270-370 m/s). The speed of sound at sea level is approximately 1,125 ft/s.