Convert Kilometers per Hour to Feet per Second
Kilometer per Hour (km/h) to Foot per Second (ft/s) unit conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 km/h = 0.91134442 ft/s
1 Kilometer per Hour = 0.91134442 Feet per Second
1 Foot per Second = 1.09728 Kilometers per Hour
1 km/h in every supported unit
Conversion chart: Kilometer per Hour to Feet per Second
Conversion table
| Kilometer per Hour (km/h) | Foot per Second (ft/s) |
|---|---|
| 0.01 km/h | 0.0091134442 ft/s |
| 0.1 km/h | 0.091134442 ft/s |
| 1 km/h | 0.91134442 ft/s |
| 2 km/h | 1.8226888 ft/s |
| 3 km/h | 2.7340332 ft/s |
| 5 km/h | 4.5567221 ft/s |
| 10 km/h | 9.1134442 ft/s |
| 20 km/h | 18.226888 ft/s |
| 50 km/h | 45.567221 ft/s |
| 100 km/h | 91.134442 ft/s |
| 1000 km/h | 911.34442 ft/s |
Kilometer per Hour (km/h)
Definition: A speed of one kilometer covered in one hour, equal to 1000/3600 (about 0.2778) meters per second.
History: It followed naturally from the metric system's adoption in the 18th and 19th centuries, becoming the practical everyday speed unit once motor vehicles made rapid, long-distance travel common in the late 19th and early 20th centuries.
Current use: The standard unit for vehicle speed limits, speedometers, and road signage across nearly every country in the world except the United States, Liberia, Myanmar, and the United Kingdom (which still uses mph on roads).
Foot per Second (ft/s)
Definition: A speed of one foot (0.3048 meters) covered in one second.
History: Derived directly from the foot, a unit of English origin standardized by statute over the medieval period and later fixed to the meter by the 1959 international yard-and-pound agreement.
Current use: Commonly used in the US for ballistics (muzzle velocity), fall speed, engineering calculations, and some sports statistics such as pitch speed analysis.
Supported Units
| Unit | Symbol | In Meters per Second |
|---|---|---|
| Meter per Second | m/s | 1 m/s |
| Kilometer per Hour | km/h | 0.27777778 m/s |
| Mile per Hour | mph | 0.44704 m/s |
| Knot | kn | 0.51444444 m/s |
| Foot per Second | ft/s | 0.3048 m/s |
| Mach | Ma | 343 m/s |
About These Parameters
- Value
- The number you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input speed is currently measured in.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Speed Conversion Works
The Formula
Speed is always distance divided by time, so every speed unit is really a length unit paired with a time unit — meters per second, miles per hour, and so on. Because each unit here is defined by a fixed multiplier relative to meters per second, converting between any two of them reduces to one multiplication:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Kilometer per Hour → Foot per Second: multiply by 0.91134442. For example, 1 km/h × 0.91134442 = 0.91134442 ft/s.
Km/h vs. Mph: Two Road-Speed Conventions
Almost every country measures road speed in kilometers per hour, a direct consequence of adopting the metric system for distance. The United States, and to a lesser extent the United Kingdom, instead use miles per hour, inherited from the English statute mile. This split means the same physical speed carries very different numbers depending on where you are — 100 km/h (a common highway speed outside the US) is about 62 mph, while a US highway speed of 65 mph is about 105 km/h. Vehicle speedometers in most countries display both scales for exactly this reason.
Knots and Nautical Navigation
Ships and aircraft measure speed in knots rather than km/h or mph because a knot — one nautical mile per hour — ties directly to the latitude scale used on navigation charts: one nautical mile equals one minute of latitude, so a vessel's speed in knots can be read almost directly off chart distances without conversion. This convention dates back to 19th-century maritime navigation and remains the international standard for both sea and air travel today, including in official aviation wind and airspeed reports.
Mach Number Is Not a Fixed Speed
Unlike the other units on this page, Mach number is a ratio, not a fixed distance-per-time value — it compares an object's speed to the local speed of sound, which itself changes with air temperature and altitude (sound travels slower in the cold, thin air at high altitude than at sea level). This converter uses the standard sea-level reference speed of sound, 343 m/s at 15°C, as a fixed conversion factor, which makes it a useful approximation but not an altitude-adjusted true Mach reading — real aircraft instruments calculate Mach number continuously from actual local air temperature.
Example
1 km/h equals 0.91134442 ft/s. For scale, that's about 0.2× an average human walking pace (1.4 m/s, or 5.04 km/h).
Frequently Asked Questions
How many Feet per Second are in 1 Kilometer per Hour?
1 Kilometer per Hour (km/h) equals exactly 0.91134442 Feet per Second (ft/s).
Why do some countries use km/h and others use mph?
It follows directly from which distance system a country adopted: countries on the metric system measure road speed in kilometers per hour, while the United States and, on-road, the United Kingdom use miles per hour because they retained the imperial mile for everyday distance measurement.
Is a knot the same as a mile per hour?
No — a knot is one nautical mile (1,852 m) per hour, while a mile per hour is based on the shorter statute mile (1,609.344 m). One knot equals about 1.15 mph, so knots always read slightly higher than mph for the same physical speed.
Does Mach 1 always equal the same speed?
No — the speed of sound depends on air temperature and, indirectly, altitude, so Mach 1 is slower at high, cold altitude than at sea level on a warm day. This converter uses the fixed standard sea-level reference (343 m/s at 15°C) rather than an altitude-adjusted value.