Feet Per Second to Kilometers Per Hour
An instant feet per second-to-kilometers per hour converter, with the formula and a reference table below.
| Feet Per Second | Kilometers Per Hour |
|---|---|
| 1 ft/s | 1.09728 km/h |
| 2 ft/s | 2.19456 km/h |
| 3 ft/s | 3.29184 km/h |
| 5 ft/s | 5.4864 km/h |
| 10 ft/s | 10.9728 km/h |
| 25 ft/s | 27.432 km/h |
| 50 ft/s | 54.864 km/h |
| 100 ft/s | 109.728 km/h |
How to use
- Enter a value in the Feet Per Second field.
- The Kilometers Per Hour figure appears immediately — no button to press.
- Typing in the Kilometers Per Hour field converts back to Feet Per Second the same way.
- Use the reference table for the values that come up most often.
Feet Per Second to Kilometers Per Hour formula
Converting feet per second to kilometers per hour is a single multiplication by 1.09728.
km/h = ft/s × 1.09728
Why this factor: the foot per second and the kilometer per hour are both defined against the meter per second, so dividing one definition by the other gives 1.09728 directly. Both definitions are set out in full below.
To go the other way, divide by 1.09728 — or use the Kilometers Per Hour to Feet Per Second converter, which is the same calculation reversed.
Worked example
Take 30 ft/s and multiply by the factor 1.09728: the result is 32.9184 km/h.
30 ft/s × 1.09728 = 32.9184 km/h
The converter above does this for any value you type, in either direction.
What is a foot per second?
Feet per second is a US engineering speed unit, common where distances are short.
Definition: Exactly 0.3048 meter per second, following from the exact definition of the foot.
Where it is used: Ballistics and muzzle velocities, fluid flow in pipes, and conveyor speeds in the US.
What is a kilometer per hour?
Kilometers per hour is the everyday speed unit for road traffic in most of the world.
Definition: Exactly 1,000 meters per 3,600 seconds, so 1 km/h is exactly 1/3.6 m/s.
Where it is used: Speed limits, vehicle speedometers, and weather wind speeds outside the US and UK.
Worth knowing: A handy shortcut: divide km/h by 3.6 for m/s, or multiply m/s by 3.6 to go the other way.
Feet Per Second vs Kilometers Per Hour
The foot per second is an imperial unit while the kilometer per hour is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many kilometers per hour are in a foot per second?
One foot per second equals 1.09728 kilometers per hour.
What is the formula to convert feet per second to kilometers per hour?
Multiply the number of feet per second by 1.09728. To reverse it, divide by 1.09728 instead.
How do I convert kilometers per hour back to feet per second?
Divide by 1.09728, which is the same as multiplying by 0.911344415.
How many kilometers per hour are in 10 feet per second?
10 ft/s works out to 10.9728 km/h.
Is there anything to watch out for with kilometers per hour?
A handy shortcut: divide km/h by 3.6 for m/s, or multiply m/s by 3.6 to go the other way.
How is the foot per second defined?
Exactly 0.3048 meter per second, following from the exact definition of the foot.