Feet per Second to Kilometers per Hour (ft/s to km/h)
1 foot per second (ft/s) = 1.09728 kilometers per hour (km/h). 1 km/h = 0.9113444153 ft/s. Example: 15 ft/s = 15 × 1.09728 = 16.4592 km/h.
Also searched as feet per second to km/h, feet per second in km/h, feet per second into kilometers per hour, ft/s to km/h, ft/s in kilometers per hour, ft/s into kilometer per hour, foot per second to kilometer per hour, ft/s to kilometers per hour converter, feet per second to kilometres per hour and how many kilometers per hour in a foot per second.
1 ft/s = 1.09728 km/h
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk foot per second to kilometer per hour converter to paste a column from Excel.
How to Convert Foot per Second to Kilometer per Hour
- 1 ft/s = 1.09728 km/h
- 1 km/h = 0.9113444153 ft/s
- Example: convert 15 ft/s to km/h: 15 ft/s = 15 × 1.09728 km/h = 16.4592 km/h
Formula
km/h = ft/s × 1.09728
Derivation from SI units:
- 1 ft/s = 0.3048 m/s exactly.
- 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s exactly.
- 1 ft/s = 0.3048 m/s ÷ 0.2777777777778 m/s per km/h = 1.09728 km/h
Both units are defined exactly, so the factor is exact. Foot per Second definition: foot per second; Kilometer per Hour definition: kilometer per hour.
Worked examples
- A reading of 20 ft/s converts to 21.9456 km/h.
20 ft/s × 1.09728 = 21.9456 km/h - A value of 100 ft/s is 109.728 km/h.
100 ft/s × 1.09728 = 109.728 km/h
Foot per Second to Kilometer per Hour conversion table
| Feet per Second (ft/s) | Kilometers per Hour (km/h) |
|---|---|
| 1 ft/s | 1.09728 km/h |
| 5 ft/s | 5.4864 km/h |
| 10 ft/s | 10.9728 km/h |
| 20 ft/s | 21.9456 km/h |
| 50 ft/s | 54.864 km/h |
| 88 ft/s | 96.56064 km/h |
| 100 ft/s | 109.728 km/h |
| 500 ft/s | 548.64 km/h |
| 1000 ft/s | 1097.28 km/h |
| 1125 ft/s | 1234.44 km/h |
Where it's used
Feet per Second are used for muzzle velocity and ballistics, while kilometers per hour appear in road speed limits and car speedometers. Both measure speed (distance per time), so the conversion is a fixed factor.
Foot per Second to other speed units
| Conversion | 1 ft/s equals |
|---|---|
| foot per second to kilometer per hour | 1.09728 km/h |
| foot per second to meter per second | 0.3048 m/s |
| foot per second to mile per hour | 0.6818181818 mph |
| foot per second to knot | 0.5924838013 kn |
Frequently asked questions
How many kilometers per hour are in 1 foot per second?
1 ft/s = 1.09728 km/h.
How do I convert feet per second to kilometers per hour?
Multiply the value in ft/s by 1.09728. For example, 15 ft/s × 1.09728 = 16.4592 km/h.
Is the ft/s to km/h conversion exact?
Yes. Both units are defined exactly, and 1 ft/s is exactly 1.09728 km/h.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "foot per second".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (radian) and Table 8 (non-SI units accepted for use with the SI).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Feet per Second to Kilometers per Hour (ft/s to km/h). Retrieved October 25, 2026, from https://scientificconverters.com/speed/feet-per-second-to-kilometers-per-hour/
IEEE
Scientific Converters, "Feet per Second to Kilometers per Hour (ft/s to km/h)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/speed/feet-per-second-to-kilometers-per-hour/