ConvBolt — Unit ConverterFeet per second to Miles per hour Converter
Converting feet per second to miles per hour is a multiplication by a fixed factor: 1 ft/s = 0.6818182 mph. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one foot per second works out to 0.6818182 mph, the mile per hour is the smaller unit of the two: a figure given in mile per hour always carries a smaller number than the same measurement in foot per second. A chart drawn in ft/s can hide that, so check which label the axis uses before you compare two readings.
Driving and sport are the everyday sources of this pair: a dashboard reading in feet per second against a speed limit posted in miles per hour, or a training plan written in one while a device reports the other.
The conversion factor used here is 0.6818182 mph per foot per second (7 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 ft/s a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 1.466667 ft/s per mph, the exact reciprocal, so a round trip through both pages returns your original number.
Feet per second to Miles per hour formula
Use this formula to convert any foot per second value to miles per hour:
Worked example: 100 ft/s × 0.6818182 = 68.18182 mph.
Feet per second to Miles per hour conversion table
| Feet per second (ft/s) | Miles per hour (mph) |
|---|---|
| 0.5 ft/s | 0.3409091 mph |
| 1 ft/s | 0.6818182 mph |
| 2 ft/s | 1.363636 mph |
| 5 ft/s | 3.409091 mph |
| 10 ft/s | 6.818182 mph |
| 20 ft/s | 13.63636 mph |
| 50 ft/s | 34.09091 mph |
| 100 ft/s | 68.18182 mph |
| 500 ft/s | 340.9091 mph |
| 1000 ft/s | 681.8182 mph |
How to convert feet per second to miles per hour
Multiply the foot per second value by 0.6818182 to get the equivalent in miles per hour. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Miles per hour to Feet per second converter instead of dividing by hand; both pages use the same source factors. For every other ft/s conversion in one place, see the ft/s conversion hub.
Frequently asked questions
How many miles per hour are in 1 foot per second?
1 foot per second = 0.6818182 mph.
What is 100 feet per second in miles per hour?
100 ft/s = 68.18182 mph.
Is converting feet per second to miles per hour the same as miles per hour to feet per second?
No — the direction changes the multiplier. The reverse conversion (1 mph = 1.466667 ft/s) is on the Miles per hour to Feet per second page.
Related conversions
Try the ConvBolt Unit Converter for any other speed unit, browse the Speed conversions, or read our conversion guides.