Feet per second to kilometers per hour
Type a value in feet per second to see it in kilometers per hour straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the feet per second box.
- Read the result in kilometers per hour as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
km/h = ft/s × 1.09728
Multiply the value in feet per second by 1.09728 to get kilometers per hour.
Example
To convert 25 ft/s to kilometers per hour: 25 × 1.09728 = 27.432 km/h.
Conversion table
| Feet per second (ft/s) | Kilometers per hour (km/h) |
|---|---|
| 1 | 1.09728 |
| 2 | 2.19456 |
| 3 | 3.29184 |
| 5 | 5.4864 |
| 10 | 10.9728 |
| 20 | 21.9456 |
| 25 | 27.432 |
| 50 | 54.864 |
| 100 | 109.728 |
| 250 | 274.32 |
| 500 | 548.64 |
| 1,000 | 1,097.28 |
About the units
- Foot per second
- Covering one international foot (0.3048 m) in one second, exactly 0.3048 m/s. It appears in ballistics and US engineering.
- Kilometer per hour
- Covering 1000 meters in 3600 seconds, so 1 km/h is exactly 1/3.6 m/s. It is the unit on road signs and car speedometers in most countries.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilometers per hour are in one foot per second?
1 ft/s = 1.09728 km/h exactly.
How do I convert feet per second to kilometers per hour?
Use km/h = ft/s × 1.09728. For example, 25 ft/s = 27.432 km/h.
How many feet per second are in one kilometer per hour?
1 km/h = 0.911344 ft/s.
How do I convert km/h to m/s in my head?
Divide by 3.6, because an hour is 3600 seconds and a kilometer is 1000 meters. For example 72 km/h is 20 m/s; multiply by 3.6 to go back.
Why do Mach values differ between sources?
The speed of sound depends on air temperature. We use 340.294 m/s at sea level and 15 °C; at 11 km altitude it is about 295 m/s, so Mach 1 is slower there.