Convert Feet per second to Miles per hour
One foot per second equals 0.681818 miles per hour. Type any value to convert feet per second to miles per hour instantly — with a full reference table below.
Convert Feet per second to Miles per hour
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How to convert Feet per second to Miles per hour
To convert feet per second to miles per hour, multiply by 0.681818. One foot per second equals 0.681818 mph, and one mile per hour equals 1.466667 ft/s.
- Take the value in feet per second — for example 7.5 ft/s.
- Multiply by 0.681818 (the number of miles per hour in one foot per second).
- 7.5 × 0.681818 = 5.113636 mph.
Quick mental estimate: Divide the number of feet per second by 1.47 (within 0.2% of the exact answer).
Feet per second to Miles per hour conversion table
| Feet per second | Miles per hour |
|---|---|
| 1 ft/s | 0.681818 mph |
| 5 ft/s | 3.409091 mph |
| 10 ft/s | 6.818182 mph |
| 20 ft/s | 13.63636 mph |
| 25 ft/s | 17.04545 mph |
| 30 ft/s | 20.45455 mph |
| 40 ft/s | 27.27273 mph |
| 50 ft/s | 34.09091 mph |
| 60 ft/s | 40.90909 mph |
| 70 ft/s | 47.72727 mph |
| 80 ft/s | 54.54545 mph |
| 100 ft/s | 68.18182 mph |
| 120 ft/s | 81.81818 mph |
| Miles per hour | Feet per second |
|---|---|
| 1 mph | 1.466667 ft/s |
| 5 mph | 7.333333 ft/s |
| 10 mph | 14.66667 ft/s |
| 20 mph | 29.33333 ft/s |
| 25 mph | 36.66667 ft/s |
| 30 mph | 44 ft/s |
| 40 mph | 58.66667 ft/s |
| 50 mph | 73.33333 ft/s |
| 60 mph | 88 ft/s |
| 70 mph | 102.6667 ft/s |
| 80 mph | 117.3333 ft/s |
| 100 mph | 146.6667 ft/s |
| 120 mph | 176 ft/s |
About converting Feet per second to Miles per hour
Feet per second (ft/s) and Miles per hour (mph) are both units of speed. The exact factor is 1 ft/s = 0.681818 mph, so multiply by 0.681818 to go from feet per second to miles per hour (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Miles per hour to Feet per second converter, or the full unit converter for every unit at once.
Real-world speed in feet per second and miles per hour
| Example | Feet per second | Miles per hour |
|---|---|---|
| A walking pace | ≈ 4.593176 ft/s | ≈ 3.131711 mph |
| Usain Bolt's top speed (2009) | ≈ 40.74803 ft/s | ≈ 27.78275 mph |
| The UK motorway limit (70 mph) | 102.6667 ft/s | 70 mph |
| The German Autobahn advisory speed (130 km/h) | 118.4747 ft/s | 80.77823 mph |
| The speed of sound (air, 20 °C) | ≈ 1,125.328 ft/s | ≈ 767.2691 mph |
| An airliner at cruise | ≈ 820.21 ft/s | ≈ 559.2341 mph |
“≈” marks typical values; the rest are defined or measured figures.
The units
Feet per second — exactly 0.3048 m/s.
Used for: Ballistics, engineering and US sport analytics.
Miles per hour — exactly 0.44704 m/s.
Used for: Road speeds in the US and UK.
km/h, mph, ft/s and knots are all defined exactly in metres per second (a knot is one nautical mile, exactly 1,852 m, per hour).