Velocity
ft/stokm/h
Convert feet per second (ft/s) to kilometres per hour (km/h).
Factor1 ft/s = 1.09728 km/h
Converter
ft/s
Accepts numbers or expressions, e.g. 150 + 14.7
Result
km/h
Rendered to 6 significant figures.
Formula
Formula
km/h = ft/s × 1.09728
Multiply any value in feet per second by 1.09728 to obtain the value in kilometres per hour.
Worked example
Convert 50 ft/s to km/h.
- 01Start with 50 ft/s.
- 02Multiply by the conversion factor: 50 × 1.09728 = 54.864 km/h.
Result50 ft/s = 54.864 km/h
Conversion table
| ft/s | km/h |
|---|---|
| 1 | 1.0973 |
| 2 | 2.1946 |
| 5 | 5.4864 |
| 10 | 10.973 |
| 20 | 21.946 |
| 50 | 54.864 |
| 100 | 109.73 |
| 200 | 219.46 |
| 500 | 548.64 |
| 1000 | 1097.3 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from ft/s to km/h?
1 ft/s equals 1.09728 km/h. To convert, multiply the value in feet per second by 1.09728.
How do I convert 1 ft/s to km/h?
1 ft/s = 1.09728 km/h. For any value, multiply by 1.09728.
How do I convert km/h back to ft/s?
Divide by the same factor — or equivalently, multiply by 0.9113444. So 1 km/h = 0.911344 ft/s.
When would I need to convert foot per second to kilometre per hour?
Velocity conversions are needed for fluid flow analysis (line velocity targets, erosional limits), gas-stream calculations, and equipment specs that mix m/s, ft/s and engineering speed units.
Is the conversion exact?
Yes. Both ft/s and km/h are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).