Convert Feet per second to Miles per hour
1 foot per second is 0.681818 mph. One foot per second is exactly 0.681818181818 miles per hour.
One foot per second is 0.68181818 miles per hour. To convert feet per second to miles per hour, multiply by 0.68181818; to go the other way, divide by 0.68181818 or multiply by 1.4666667. The factor is exact rather than rounded: it follows from NIST Special Publication 811. Exactly 0.3048 m/s.
Factor checked against the defining standard · How we check
Miles per hour
0.681818 mph
- Feet per second × 0.68181818
value * 0.6818181818180.682 mph
1 foot per second in every speed unit
| Unit | Value | Exact factor |
|---|---|---|
| metres per second | 0.3048 m/s | × 0.3048 |
| kilometres per hour | 1.09728 km/h | × 1.09728 |
| miles per hour | 0.6818181818 mph | × 0.681818181818 |
| knots | 0.5924838013 kn | × 0.592483801296 |
| feet per second (as entered) | 1 ft/s | — |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert feet per second to miles per hour?
- 1.Take the measurement in feet per second.
- 2.Multiply by 0.68181818 — that is how many miles per hour fit in one foot per second.
- 3.To go back the other way, divide by 0.68181818, or multiply by 1.4666667.
Feet per second to miles per hour conversion table
| Feet per second | Miles per hour |
|---|---|
| 1 ft/s | 0.681818 mph |
| 2 ft/s | 1.363636 mph |
| 3 ft/s | 2.045455 mph |
| 4 ft/s | 2.727273 mph |
| 5 ft/s | 3.409091 mph |
| 6 ft/s | 4.090909 mph |
| 7 ft/s | 4.772727 mph |
| 8 ft/s | 5.454545 mph |
| 9 ft/s | 6.136364 mph |
| 10 ft/s | 6.818182 mph |
| 12 ft/s | 8.181818 mph |
| 15 ft/s | 10.227273 mph |
| 20 ft/s | 13.636364 mph |
| 25 ft/s | 17.045455 mph |
| 50 ft/s | 34.090909 mph |
| 100 ft/s | 68.181818 mph |
What are feet per second and miles per hour?
- Foot per second (ft/s)
- Exactly 0.3048 m/s. Muzzle velocities, falling objects and anything where a foot is the natural length.
- Mile per hour (mph)
- Exactly 0.44704 m/s, because a mile is exactly 1,609.344 metres. US and UK road speeds.
Source: NIST Special Publication 811 — conversion factors for speed
Questions people actually ask
- How many miles per hour are in a foot per second?
- 0.68181818. Exactly 0.44704 m/s, because a mile is exactly 1,609.344 metres. US and UK road speeds.
- How do I convert miles per hour back to feet per second?
- Divide by 0.68181818, or multiply by 1.4666667 — they are the same operation.
Other speed conversions
Miles per hour to feet per second — the same conversion the other way.