Miles per hour to feet per second
Type a value in miles per hour to see it in feet per second straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the miles per hour box.
- Read the result in feet per second as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
ft/s = mph × 1.466666667
Multiply the value in miles per hour by 1.466666667 to get feet per second.
Example
To convert 25 mph to feet per second: 25 × 1.466666667 = 36.6667 ft/s.
Conversion table
| Miles per hour (mph) | Feet per second (ft/s) |
|---|---|
| 1 | 1.46667 |
| 2 | 2.93333 |
| 3 | 4.4 |
| 5 | 7.33333 |
| 10 | 14.6667 |
| 20 | 29.3333 |
| 25 | 36.6667 |
| 50 | 73.3333 |
| 100 | 146.667 |
| 250 | 366.667 |
| 500 | 733.333 |
| 1,000 | 1,466.67 |
About the units
- Mile per hour
- Covering one international mile (1609.344 m) in one hour, exactly 0.44704 m/s. It is used on roads in the United States and the United Kingdom.
- Foot per second
- Covering one international foot (0.3048 m) in one second, exactly 0.3048 m/s. It appears in ballistics and US engineering.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many feet per second are in one mile per hour?
1 mph = 1.46667 ft/s exactly.
How do I convert miles per hour to feet per second?
Use ft/s = mph × 1.466666667. For example, 25 mph = 36.6667 ft/s.
How many miles per hour are in one foot per second?
1 ft/s = 0.681818 mph.
How do I convert km/h to m/s in my head?
Divide by 3.6, because an hour is 3600 seconds and a kilometer is 1000 meters. For example 72 km/h is 20 m/s; multiply by 3.6 to go back.
Why do Mach values differ between sources?
The speed of sound depends on air temperature. We use 340.294 m/s at sea level and 15 °C; at 11 km altitude it is about 295 m/s, so Mach 1 is slower there.