Convert Feet per Second to Miles per Hour (ft/s to mph)
1 foot per second (ft/s) = 0.6818181818 miles per hour (mph). 1 mph = 1.466666667 ft/s. Example: 15 ft/s = 15 × 0.6818181818 = 10.22727273 mph.
Also searched as feet per second to mph, feet per second in mph, feet per second into miles per hour, ft/s to mph, ft/s in miles per hour, ft/s into mile per hour, foot per second to mile per hour, ft/s to miles per hour converter and how many miles per hour in a foot per second.
1 ft/s = 0.6818181818 mph
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk foot per second to mile per hour converter to paste a column from Excel.
How to Convert Foot per Second to Mile per Hour
- 1 ft/s = 0.6818181818 mph
- 1 mph = 1.466666667 ft/s
- Example: convert 15 ft/s to mph: 15 ft/s = 15 × 0.6818181818 mph = 10.22727273 mph
Formula
mph = ft/s × 0.6818181818182
or mph = ft/s ÷ 1.466666666667
Derivation from SI units:
- 1 ft/s = 0.3048 m/s exactly.
- 1 mph = 1609.344 m ÷ 3600 s = 0.44704 m/s exactly.
- 1 ft/s = 0.3048 m/s ÷ 0.44704 m/s per mph = 0.6818181818182 mph
Both units are defined exactly, so the factor is exact. Foot per Second definition: foot per second; Mile per Hour definition: mile per hour.
Worked examples
- A reading of 20 ft/s converts to 13.63636364 mph.
20 ft/s × 0.6818181818 = 13.63636364 mph - A value of 100 ft/s is 68.18181818 mph.
100 ft/s × 0.6818181818 = 68.18181818 mph
Foot per Second to Mile per Hour conversion table
| Feet per Second (ft/s) | Miles per Hour (mph) |
|---|---|
| 1 ft/s | 0.6818181818 mph |
| 5 ft/s | 3.409090909 mph |
| 10 ft/s | 6.818181818 mph |
| 20 ft/s | 13.63636364 mph |
| 50 ft/s | 34.09090909 mph |
| 88 ft/s | 60 mph |
| 100 ft/s | 68.18181818 mph |
| 500 ft/s | 340.9090909 mph |
| 1000 ft/s | 681.8181818 mph |
| 1125 ft/s | 767.0454545 mph |
Where it's used
Feet per Second are used for muzzle velocity and ballistics, while miles per hour appear in US and UK speed limits. 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 mile per hour | 0.6818181818 mph |
| foot per second to meter per second | 0.3048 m/s |
| foot per second to kilometer per hour | 1.09728 km/h |
| foot per second to knot | 0.5924838013 kn |
Frequently asked questions
How many miles per hour are in 1 foot per second?
1 ft/s = 0.6818181818 mph.
How do I convert feet per second to miles per hour?
Multiply the value in ft/s by 0.6818181818, or divide it by 1.466666667. For example, 15 ft/s × 0.6818181818 = 10.22727273 mph.
Is the ft/s to mph conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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".
- 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, "mile per hour".
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). Convert Feet per Second to Miles per Hour (ft/s to mph). Retrieved October 25, 2026, from https://scientificconverters.com/speed/feet-per-second-to-miles-per-hour/
IEEE
Scientific Converters, "Convert Feet per Second to Miles per Hour (ft/s to mph)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/speed/feet-per-second-to-miles-per-hour/