Feet/Second to MPH
Convert foot/second to mile/hour instantly — type a value and read the result, with the exact formula shown.
Reviewed by the CalcCafe editorial team · Last updated 1 July 2026 · How we test our tools
Example
1 ft/s = 0.6818182 mph, 5 ft/s = 3.409091 mph, 10 ft/s = 6.818182 mph.
Common conversions: foot/second to mile/hour
Quick reference for the ft/s → mph values you are most likely to need, computed with the exact factor the converter above uses. It includes the specific values people most often look up (1,000 ft/s, 100 ft/s, 3,000 ft/s, 400 ft/s, 300 ft/s).
| Foot/second (ft/s) | Mile/hour (mph) |
|---|
| 1 ft/s | 0.681818 mph |
| 2 ft/s | 1.3636 mph |
| 3 ft/s | 2.0455 mph |
| 5 ft/s | 3.4091 mph |
| 10 ft/s | 6.8182 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 |
| 70 ft/s | 47.7273 mph |
| 75 ft/s | 51.1364 mph |
| 80 ft/s | 54.5455 mph |
| 90 ft/s | 61.3636 mph |
| 100 ft/s | 68.1818 mph |
| 150 ft/s | 102.2727 mph |
| 200 ft/s | 136.3636 mph |
| 250 ft/s | 170.4545 mph |
| 300 ft/s | 204.5455 mph |
| 400 ft/s | 272.7273 mph |
| 500 ft/s | 340.9091 mph |
| 1,000 ft/s | 681.8182 mph |
| 1,200 ft/s | 818.1818 mph |
| 3,000 ft/s | 2,045.45 mph |
| 4,000 ft/s | 2,727.27 mph |
Mile/hour to Foot/second
| Mile/hour (mph) | Foot/second (ft/s) |
|---|
| 1 mph | 1.4667 ft/s |
| 5 mph | 7.3333 ft/s |
| 10 mph | 14.6667 ft/s |
| 50 mph | 73.3333 ft/s |
| 100 mph | 146.6667 ft/s |
How it works
Mile/hour = Foot/second × 0.6818182. Every value is converted through a single meter/second base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Feet per second and miles per hour both measure speed using the imperial system, but they live in very different worlds. Feet per second is the language of physics labs, ballistics, and engineering — a paintball pellet leaves a marker around 290 ft/s, and free-falling objects accelerate at 32.2 ft/s² near Earth's surface. Miles per hour is how everyday Americans read a speedometer or a weather report. Converting between them lets you translate a lab or sensor reading into a number people actually feel: that 290 ft/s paintball is moving about 198 mph.
Both units are anchored to the foot and the mile, which are defined in terms of the metric system (1 foot = 0.3048 meter exactly, 1 mile = 5,280 feet). That shared definition is why the conversion factor is exact rather than an approximation. To go from ft/s to mph you multiply by 3,600 seconds per hour and divide by 5,280 feet per mile, which collapses to a single tidy factor of 0.6818182.
The handy rule of thumb: roughly two-thirds. Multiply feet per second by 2/3 and you land within about 2% of the true mph — fast enough for a quick sanity check in your head. Going the other way, multiply mph by 1.5 to estimate feet per second (the exact factor is 1.466667), so 60 mph is about 88 ft/s, a number worth memorizing.
The most common mistake is confusing this with feet per minute or assuming the factor is a round number like 0.7. It is not — using 0.7 instead of 0.6818182 inflates your answer by nearly 3%, which matters for muzzle velocity, wind speed, or projectile calculations where small errors compound. When precision counts, keep the full factor rather than the mental shortcut.
Frequently asked questions
How do you convert foot/second to mile/hour?
Multiply the number of foot/seconds by 0.6818182 to get mile/hours. For example, 1 ft/s = 0.6818182 mph.
What is 1 foot/second in mile/hours?
1 foot/second equals 0.6818182 mile/hours (1 ft/s = 0.6818182 mph).
How many foot/seconds are in 1 mile/hour?
There are 1.466667 foot/seconds in 1 mile/hour.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How fast is 100 feet per second in mph?
100 ft/s equals about 68.18 mph (100 × 0.6818182). A quick mental estimate using the two-thirds rule gives roughly 67 mph.
What is 88 feet per second in miles per hour?
88 ft/s is exactly 60 mph. This is a classic benchmark because 60 mph equals 88 ft/s, making it easy to remember in both directions.
How do I convert mph back to feet per second?
Multiply miles per hour by 1.466667 to get feet per second. For example, 30 mph = 44 ft/s and 60 mph = 88 ft/s.
Why is the conversion factor 0.6818182?
It comes from multiplying by 3,600 seconds per hour and dividing by 5,280 feet per mile, which equals 3600/5280 = 0.6818182. Because both the foot and mile are exactly defined, this factor is exact, not rounded.
Is feet per second faster than mph for the same number?
Yes. A value in feet per second is faster than the same number in mph, since 1 ft/s is only 0.68 mph. So 50 ft/s (about 34 mph) sounds bigger but is slower than 50 mph.
What is a paintball's speed of 300 ft/s in mph?
300 ft/s converts to about 204.5 mph (300 × 0.6818182). The 300 ft/s field limit is standard for safe play.
How many feet per second is the speed of sound?
The speed of sound at sea level is about 1,125 ft/s, which is roughly 767 mph (1,125 × 0.6818182).
What is 500 fps in mph?
500 feet per second is about 341 miles per hour. Using the page's factor, 500 × 0.6818182 = 340.9 mph. Speeds in this range are typical of airsoft and high-powered pellet projectiles, which is why manufacturers quote them in feet per second.
How fast is 200 feet in 6 seconds?
Covering 200 feet in 6 seconds is 200 ÷ 6 = 33.3 feet per second, which is 33.3 × 0.6818182 = 22.7 mph. To get speed, divide distance by time, then apply the conversion factor. In metric terms that is about 10.2 meters per second.
How many feet would a human fall in 6 seconds?
Ignoring air resistance, an object falls ½ × 32.2 × 6² = 579.6 feet in 6 seconds and would be moving at 32.2 × 6 = 193 ft/s, or 193 × 0.6818182 = 132 mph. A real person falls somewhat less because air drag builds up quickly and caps a skydiver's speed at a terminal velocity of roughly 120 mph in a belly-down position. The free-fall formula is a good approximation only for the first couple of seconds.
How far do you travel in 1 second at 10 mph?
At 10 mph you cover about 14.7 feet every second, since 10 ÷ 0.6818182 = 14.67 ft/s. A handy rule of thumb is that mph × 1.467 gives feet per second, so 30 mph is 44 ft/s and 60 mph is 88 ft/s. Traffic engineers work in feet per second for exactly this reason: multiplying it by a driver's reaction time gives the distance travelled before braking even starts.
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Sources & references
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