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.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
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 Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.