Feet per second to miles per hour
1 foot per second = 0.681818 miles per hour
Type a value in feet per second (ft/s) to get miles per hour (mph) straight away. A foot per second is smaller than a mile per hour, so the number goes down. Both units belong to speed, measured here against the meter per second.
1 ft/s = 0.68181818 mph
Formula
mph = ft/s × 0.68181818
One foot per second is 0.68181818 miles per hour, so multiply by that factor. You can also divide by 1.46667, the number of feet per second in one mile per hour. Here ft/s is the value in feet per second and mph is the result in miles per hour.
Worked example: 10 feet per second × 0.68181818 = 6.81818 miles per hour.
Feet per second to miles per hour table
| feet per second (ft/s) | miles per hour (mph) |
|---|---|
| 1 ft/s | 0.681818 mph |
| 2 ft/s | 1.36364 mph |
| 3 ft/s | 2.04545 mph |
| 4 ft/s | 2.72727 mph |
| 5 ft/s | 3.40909 mph |
| 6 ft/s | 4.09091 mph |
| 7 ft/s | 4.77273 mph |
| 8 ft/s | 5.45455 mph |
| 9 ft/s | 6.13636 mph |
| 10 ft/s | 6.81818 mph |
| 15 ft/s | 10.2273 mph |
| 20 ft/s | 13.6364 mph |
| 25 ft/s | 17.0455 mph |
| 30 ft/s | 20.4545 mph |
| 40 ft/s | 27.2727 mph |
| 50 ft/s | 34.0909 mph |
| 60 ft/s | 40.9091 mph |
| 75 ft/s | 51.1364 mph |
| 100 ft/s | 68.1818 mph |
Everyday feet per second in miles per hour
| What it is | ft/s | mph |
|---|---|---|
| walking pace | 4.6 ft/s | 3.13636 mph |
| jogging pace | 10 ft/s | 6.81818 mph |
| a sprinter (about) | 32 ft/s | 21.8182 mph |
| the speed of sound in air (about) | 1,125 ft/s | 767.045 mph |
| a rifle bullet (about) | 3,000 ft/s | 2,045.45 mph |
Quick estimate in your head
Multiply by about 0.68. For 10 ft/s that gives 6.8 mph against an exact 6.81818 mph, an error of 0.3%.
About the units
Foot per second (ft/s). Exactly 0.3048 m/s. Used for projectile and fluid speeds in the US.
Mile per hour (mph). Exactly 0.44704 m/s. Used for road speeds in the US and UK.
Going the other way, 1 mile per hour is 1.46667 feet per second.
Questions
How many miles per hour are in 1 foot per second?
1 foot per second is 0.681818 miles per hour, and 1 mile per hour is 1.46667 feet per second.
How do I convert feet per second to miles per hour?
Use mph = ft/s × 0.68181818. For example, 10 feet per second × 0.68181818 = 6.81818 miles per hour.
Is the foot per second to mile per hour factor exact?
The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.
How much is a rifle bullet in miles per hour?
3,000 ft/s is 2,045.45 mph.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).
Related conversions
- miles per hour to feet per second
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