Foot per Hour to Kilometer per Hour
ft/s
km/h
Conversion History
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|---|---|---|
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Quick Reference Table (Foot per Hour to Kilometer per Hour)
| Foot per Hour (ft/s) | Kilometer per Hour (km/h) |
|---|---|
| 1 | 0.000304800000001219188 |
| 5 | 0.001524000000006096012 |
| 10 | 0.003048000000012191988 |
| 50 | 0.015240000000060960012 |
| 100 | 0.030480000000121919988 |
| 500 | 0.152400000000609600012 |
About Foot per Hour (ft/s)
The foot per hour (ft/h) is a very slow imperial unit of speed, analogous to the metric meter per hour, used when movement is so gradual that expressing it in miles per hour would yield impractically small decimals. One foot per hour is about 0.000085 mph or 0.000305 km/h. The unit finds use in geology (fault creep rates), materials science (crack propagation), and some industrial processes (extrusion rates, slow conveyor speeds). It provides a conveniently sized number when the phenomenon moves on the scale of feet per hour rather than miles per day.
Tectonic fault creep can be a few feet per hour during a slow-slip event. Industrial extruders may run at 10–100 ft/h.
About Kilometer per Hour (km/h)
The kilometer per hour (km/h) is the most widely used everyday unit of speed globally, appearing on road signs, vehicle speedometers, and weather reports in most metric countries. It expresses how many kilometers an object travels in one hour. Typical car speeds range from 50 km/h in urban areas to 130 km/h on motorways. Commercial aircraft cruise at 800–900 km/h. The conversion to m/s is straightforward: divide by 3.6. The unit is intuitive for distances most people encounter daily — a 60 km/h speed limit means covering a kilometer roughly every minute.
Urban speed limits are typically 50 km/h. Motorway limits are commonly 100–130 km/h. A cyclist averages 15–25 km/h.
Foot per Hour – Frequently Asked Questions
Do tectonic plates actually move in feet per hour?
Tectonic plates move at 2–15 cm/year on average — far below even 1 ft/h. However, during episodic "slow-slip events" on faults (a kind of slow-motion earthquake), the fault face can creep at detectable rates closer to mm/day. True ft/h movement would be catastrophic — the San Andreas Fault creeping at 1 ft/h would translate to 2.4 miles/day, far exceeding any measured geological rate.
What industrial processes run at speeds measured in ft/h?
Metal extrusion (forming rods or tubes by forcing material through a die) often runs at 1–100 ft/h depending on the alloy and die profile. Some ceramic and glass fiber drawing processes operate in this range. Paper mill wet-end press sections can be as slow as 10–50 ft/h during startup. These speeds are slow enough that workers can safely observe and adjust the process manually.
How does ft/h compare to the speed of a melting iceberg?
Icebergs drift with ocean currents at roughly 0.5–1 km/day, equivalent to about 55–110 ft/h. Calving glaciers can lurch forward at thousands of ft/h during surge events. The famous 2017 calving of iceberg A-68 from the Larsen C ice shelf happened over a period of days — so its "speed" of separation was only a few ft/h at most.
Why would anyone use ft/h instead of just saying inches per day?
It depends on the magnitude. 1 ft/h = 24 ft/day = 288 in/day — for something moving a few feet per hour, inches per day becomes a large awkward number. Conversely, for very slow movement (0.01 ft/h = 2.88 in/day), in/day gives a cleaner number. Engineers choose whichever unit gives a value between roughly 1 and 1,000 to minimize leading zeros.
Is there any creature that moves at about 1 ft/h?
Sea stars (starfish) move at roughly 0.06 m/min, which is about 11.8 ft/h — surprisingly fast. Coral polyps and sea anemones are essentially sessile but can contract at a few mm/min. Some fungi extend their hyphal tips at 1–4 mm/h — about 0.003–0.013 ft/h. Slime molds (Physarum polycephalum), often used in computing research, can advance at up to 4 cm/h (about 1.3 ft/h).
Kilometer per Hour – Frequently Asked Questions
Which countries use km/h and which use mph for road speeds?
Most of the world uses km/h, including all of the EU, Australia, Canada, China, and India. The United States, Myanmar, and Liberia are the primary countries still using miles per hour for road signs. The UK is a notable exception — it uses mph on roads despite being otherwise metric in daily life, a situation that has persisted since the 1970s metrication program stalled.
How fast do commercial planes fly in km/h?
Typical commercial jets (Boeing 737, Airbus A320) cruise at 800–900 km/h at altitude, roughly Mach 0.78–0.85. The Concorde flew at 2,179 km/h (Mach 2.04). Airspeed is officially measured in knots (1 knot ≈ 1.852 km/h), so flight data systems show 432–485 knots, not km/h, even in metric countries.
What is the fastest speed ever achieved by a car in km/h?
The land speed record is 1,227.985 km/h (763.035 mph), set by Andy Green in the jet-powered ThrustSSC in 1997 in the Black Rock Desert, Nevada — breaking the sound barrier on land. The fastest production car is the SSC Tuatara, which achieved 455 km/h in 2020. Most track supercars top out around 320–350 km/h.
What is the fastest animal on Earth in km/h?
The peregrine falcon holds the overall record at roughly 390 km/h in a hunting dive (stoop). On land, the cheetah tops out at about 112 km/h in short bursts. The black marlin is the fastest fish at approximately 130 km/h. Among insects, the Australian tiger beetle runs at 9 km/h — slow-sounding until you realize that, for its body size, it is moving so fast its eyes cannot keep up and it has to stop repeatedly to re-locate prey.
How do weather services report wind speed — km/h or m/s?
It depends on the country. The UK Met Office and Australian BOM use km/h for public forecasts. European services often use km/h or m/s depending on audience — scientific literature uses m/s. In the US, wind speed is given in mph or knots. The World Meteorological Organization uses m/s as the standard for international data exchange.