Instantly Convert ft/s ↔ km/h — Both Directions
Convert feet per second to kilometres per hour (ft/s → km/h) or kilometres per hour to feet per second (km/h → ft/s) instantly. Get the exact conversion with formula breakdown, reference table, and real-world examples — all free, no sign-up needed.
Feet per second and kilometres per hour are both units of speed — one from the imperial system, one from the metric. Our converter handles both directions instantly and accurately using the exact internationally defined conversion factor of 1 ft/s = 1.09728 km/h.
Feet per second (ft/s or fps) is an imperial unit of speed that measures how many feet an object travels in one second. It is widely used in the United States for ballistics, physics, athletics, and engineering. Since 1 foot = 0.3048 metres exactly, the conversion to metric units is perfectly precise with no rounding required.
Kilometres per hour (km/h or kph) is the metric unit of speed used on road signs, speedometers, and weather reports across most of the world. One kilometre per hour means travelling 1,000 metres in 3,600 seconds. It is the standard speed unit in over 160 countries and is part of the International System of Units (SI).
The exact conversion factor is 1 ft/s = 1.09728 km/h. This is derived from the fact that 1 foot = 0.3048 metres and 1 hour = 3,600 seconds: (0.3048 × 3600) ÷ 1000 = 1.09728. For the reverse, 1 km/h = 0.911344 ft/s. All conversions on this page use these exact values.
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The conversion between feet per second and kilometres per hour is based on exact, defined values. Since 1 foot = 0.3048 metres exactly and 1 hour = 3,600 seconds, the conversion factor can be derived with complete mathematical precision — no approximation involved.
The table below lists commonly needed ft/s to km/h conversions. All values use the exact factor of 1 ft/s = 1.09728 km/h. For km/h to ft/s, divide by 1.09728 or use the converter above.
| Feet per Second (ft/s) | Kilometres per Hour (km/h) | Miles per Hour (mph) | Metres per Second (m/s) | Common Context |
|---|---|---|---|---|
| 1 ft/s | 1.097 km/h | 0.682 mph | 0.305 m/s | Very slow walk |
| 2 ft/s | 2.195 km/h | 1.364 mph | 0.610 m/s | Slow walk pace |
| 5 ft/s | 5.486 km/h | 3.409 mph | 1.524 m/s | Brisk walking speed |
| 8.8 ft/s | 9.656 km/h | 6.000 mph | 2.682 m/s | Slow jogging pace |
| 10 ft/s | 10.973 km/h | 6.818 mph | 3.048 m/s | Easy running pace |
| 15 ft/s | 16.459 km/h | 10.227 mph | 4.572 m/s | Fast runner |
| 20 ft/s | 21.946 km/h | 13.636 mph | 6.096 m/s | Sprinting speed |
| 29.3 ft/s | 32.187 km/h | 20.000 mph | 8.961 m/s | Urban speed limit (some zones) |
| 44 ft/s | 48.280 km/h | 30.000 mph | 13.411 m/s | Residential speed limit (US) |
| 60 ft/s | 65.837 km/h | 40.909 mph | 18.288 m/s | Sub-highway road speed |
| 88 ft/s | 96.561 km/h | 60.000 mph | 26.822 m/s | Motorway speed (US: 60 mph) |
| 100 ft/s | 109.728 km/h | 68.182 mph | 30.480 m/s | ~110 km/h highway speed |
| 130 ft/s | 142.646 km/h | 88.636 mph | 39.624 m/s | Fast highway / autobahn |
| 293 ft/s | 321.603 km/h | 199.773 mph | 89.306 m/s | Fast train speed |
| 1000 ft/s | 1097.28 km/h | 681.82 mph | 304.80 m/s | Near-supersonic speed |
Need to convert the other way? The table below shows common km /h values converted to feet per second. All values use the exact factor of 1 km/h = 0.911344 ft/s (= 1 ÷ 1.09728).
| Kilometres per Hour (km/h) | Feet per Second (ft/s) | Metres per Second (m/s) | Miles per Hour (mph) |
|---|---|---|---|
| 1 km/h | 0.9113 ft/s | 0.2778 m/s | 0.6214 mph |
| 5 km/h | 4.5567 ft/s | 1.3889 m/s | 3.1069 mph |
| 10 km/h | 9.1134 ft/s | 2.7778 m/s | 6.2137 mph |
| 20 km/h | 18.227 ft/s | 5.5556 m/s | 12.427 mph |
| 30 km/h | 27.340 ft/s | 8.3333 m/s | 18.641 mph |
| 50 km/h | 45.567 ft/s | 13.889 m/s | 31.069 mph |
| 60 km/h | 54.680 ft/s | 16.667 m/s | 37.282 mph |
| 80 km/h | 72.907 ft/s | 22.222 m/s | 49.710 mph |
| 100 km/h | 91.134 ft/s | 27.778 m/s | 62.137 mph |
| 110 km/h | 100.247 ft/s | 30.556 m/s | 68.351 mph |
| 120 km/h | 109.361 ft/s | 33.333 m/s | 74.565 mph |
| 130 km/h | 118.474 ft/s | 36.111 m/s | 80.778 mph |
| 200 km/h | 182.269 ft/s | 55.556 m/s | 124.274 mph |
| 300 km/h | 273.403 ft/s | 83.333 m/s | 186.411 mph |
| 1000 km/h | 911.344 ft/s | 277.778 m/s | 621.371 mph |
The ft/s to km/h conversion appears across a wide range of fields — from sports science and ballistics to automotive engineering and weather reporting. Here are the most common real-world scenarios where this conversion is essential.
Speed in the US is often expressed in miles per hour and feet per second in engineering contexts, while the rest of the world uses km/h. Converting ft/s to km/h is routine when comparing vehicle performance specs across markets. For example, a car accelerating at 88 ft/s = 96.56 km/h — just under 100 km/h.
Muzzle velocity of bullets and projectiles is universally reported in feet per second (fps) in American and British ballistics. When publishing international data or comparing with metric specs, converting to km/h or m/s is required. A bullet travelling at 1,000 ft/s = 1,097.28 km/h — nearly the speed of sound.
Sprint speed in American sports is often measured in feet per second, while international athletics uses metres per second or km/h. Usain Bolt's top speed of approximately 12.4 m/s ≈ 40.7 ft/s ≈ 44.72 km/h. Converting between these units helps coaches and scientists compare performances across systems.
Wind speed in the US is reported in mph and ft/s in technical contexts, while international meteorological agencies use km/h or m/s. Converting ft/s to km/h is standard when sharing weather data globally. Hurricane-force winds at 100 ft/s = 109.73 km/h — well into tropical storm territory.
Aircraft speeds in the US are often described in ft/s in engineering documents, alongside knots for navigation. International aviation uses km/h for ground speeds in many countries. Converting ft/s to km/h is common when reviewing foreign certification documents or comparing cross-border aircraft performance data. For reference, 1,000 ft/s ≈ 1,097 km/h — near supersonic.
Physics textbooks in the US express speed problems in ft/s, while SI-based curricula worldwide use m/s and km/h. Students regularly need to convert between these systems. Engineers working on cross-border projects must also convert imperial speed specs to metric. Always use the exact factor: 1 ft/s = 1.09728 km/h for academic and professional accuracy.
The National Institute of Standards and Technology (NIST) provides the official, authoritative reference for all US and metric unit definitions and conversion factors, including speed units.
Visit NIST →The Bureau International des Poids et Mesures (BIPM) is the international authority on the SI unit system. Their official SI brochure defines all metric units, including the metre and second from which km/h is derived.
Visit BIPM →Need to convert other speed units? Explore our full collection of free speed and velocity converters at ConcreteMetric — covering mph, m/s, knots, Mach, and more, all with formulas and reference tables.
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