Feet per Second to km/h Converter
Convert feet per second to kilometres per hour — multiply by 1.09728. Results update as you type; exact factors shown.
One foot per second is 1.0973 kilometres per hour — see the exact factor, not a rounded rule of thumb.
How the feet per second to km/h converter works
Speeds convert through metres per second. 1 km/h is 1000/3600 m/s; 1 mph is 1609.344/3600 m/s; a knot is one nautical mile (1,852 m) per hour. Mach is shown against the standard sea-level speed of sound of 340.29 m/s and varies with altitude and temperature.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common speed conversions
| From | To | Units |
|---|---|---|
| 1 ft/s | 1.0973 km/h | foot per second to kilometres per hour |
| 5 ft/s | 5.4864 km/h | feet per second to kilometres per hour |
| 10 ft/s | 10.9728 km/h | feet per second to kilometres per hour |
| 20 ft/s | 21.9456 km/h | feet per second to kilometres per hour |
| 30 ft/s | 32.9184 km/h | feet per second to kilometres per hour |
| 50 ft/s | 54.864 km/h | feet per second to kilometres per hour |
| 75 ft/s | 82.296 km/h | feet per second to kilometres per hour |
| 100 ft/s | 109.728 km/h | feet per second to kilometres per hour |
| 150 ft/s | 164.592 km/h | feet per second to kilometres per hour |
| 200 ft/s | 219.456 km/h | feet per second to kilometres per hour |
| 500 ft/s | 548.64 km/h | feet per second to kilometres per hour |
| 1,000 ft/s | 1,097.28 km/h | feet per second to kilometres per hour |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metre per seconds |
|---|---|---|
| metre per second | m/s | 1 metre per second |
| kilometre per hour | km/h | 0.2777777778 metre per second |
| mile per hour | mph | 0.44704 metre per second |
| knot | kn | 0.5144444444 metre per second |
| foot per second | ft/s | 0.3048 metre per second |
| Mach (sea level, 15 °C) | Ma | 340.29 metre per second |
FAQFrequently asked questions about speed conversion
How many km/h is 1 ft/s?
1.09728 km/h.
What is 100 ft/s in km/h?
109.7 km/h.
What is a fast pitch in km/h?
A 100 mph fastball is 146.7 ft/s, or 161 km/h.
Why is the factor so close to 1.1?
Coincidence of the definitions — a foot is 0.3048 m and an hour 3,600 s.
What is 1,000 ft/s?
1,097 km/h — roughly the muzzle velocity of a handgun round.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.