Foot/s to Mile/h Converter
Enter the value that you want to convert foot/s (ft/s) to mile/h (mi/h) or mile/h to foot/s.Also written as FT/S to MI/H conversion.
1 foot/s = 0.6818182 mile/h
Formula: mile/h = foot/s value × 0.6818182
FT/S to MI/H — foot/s to mile/h
10 foot/s = 6.81818 mile/h
Popular Speed Converters:
Why Convert Foot/s to Mile/h?
What is Foot/s?
The foot per second (ft/s or fps) is used in US engineering, ballistics, and some industrial applications.
Bullet muzzle velocities are commonly expressed in fps — a typical rifle bullet travels at 2,500-3,000 ft/s. The speed of sound at sea level is approximately 1,125 ft/s (343 m/s). US HVAC engineers measure air velocity in fpm (feet per minute), and hydraulic flow speeds in ft/s. The unit appears extensively in American engineering handbooks and military specifications.
The Mile/h Explained
The mile per hour (mph) is the standard speed unit for road transport in the United States, United Kingdom, and a few other countries.
US speed limits range from 25 mph in residential areas to 85 mph on some Texas highways. In motorsport, NASCAR top speeds exceed 200 mph, and Indy cars reach 240 mph. The UK uses mph for all road signs despite otherwise adopting metric. Baseball pitch speeds and hurricane categories are also measured in mph.
Speed Unit Conversions
Speed units vary by transport mode and country. Automobiles use km/h in most countries but mph in the US and UK. Aviation uses knots worldwide. Shipping uses knots for surface speed. Physics calculations require meters per second. Wind speeds appear in km/h, mph, knots, or Beaufort scale depending on the meteorological service. Sports timing uses m/s for track events but km/h or mph for ball speeds.
foot/s to mile/h metric conversion table
| 0.01 ft/s | = | 0.00682 mi/h |
| 0.1 ft/s | = | 0.06818 mi/h |
| 1 ft/s | = | 0.68182 mi/h |
| 2 ft/s | = | 1.36364 mi/h |
| 3 ft/s | = | 2.04545 mi/h |
| 4 ft/s | = | 2.72727 mi/h |
| 5 ft/s | = | 3.40909 mi/h |
| 6 ft/s | = | 4.09091 mi/h |
| 7 ft/s | = | 4.77273 mi/h |
| 8 ft/s | = | 5.45455 mi/h |
| 9 ft/s | = | 6.13636 mi/h |
| 10 ft/s | = | 6.81818 mi/h |
| 11 ft/s | = | 7.50000 mi/h |
| 12 ft/s | = | 8.18182 mi/h |
| 13 ft/s | = | 8.86364 mi/h |
| 14 ft/s | = | 9.54545 mi/h |
| 15 ft/s | = | 10.22727 mi/h |
| 16 ft/s | = | 10.90909 mi/h |
| 17 ft/s | = | 11.59091 mi/h |
| 18 ft/s | = | 12.27273 mi/h |
| 19 ft/s | = | 12.95455 mi/h |
| 20 ft/s | = | 13.63636 mi/h |
| 30 ft/s | = | 20.45455 mi/h |
| 40 ft/s | = | 27.27273 mi/h |
| 50 ft/s | = | 34.09091 mi/h |
| 60 ft/s | = | 40.90909 mi/h |
| 70 ft/s | = | 47.72727 mi/h |
| 80 ft/s | = | 54.54545 mi/h |
| 90 ft/s | = | 61.36364 mi/h |
| 100 ft/s | = | 68.18182 mi/h |
| 200 ft/s | = | 136.36364 mi/h |
| 300 ft/s | = | 204.54545 mi/h |
| 400 ft/s | = | 272.72727 mi/h |
| 500 ft/s | = | 340.90909 mi/h |
| 600 ft/s | = | 409.09091 mi/h |
| 700 ft/s | = | 477.27273 mi/h |
| 800 ft/s | = | 545.45455 mi/h |
| 900 ft/s | = | 613.63636 mi/h |
| 1000 ft/s | = | 681.81818 mi/h |
How to Convert FT/S to MI/H (Foot/s to Mile/h)?
We can convert foot/s to mile/h by using an example.
Example:
Convert 20 Foot/s to Mile/h?
We know 1 Foot/s = 0.6818182 mile/h; 1 Mile/h = 1.4666667 foot/s.
20 foot/s = ___mi/h
20 × 0.6818182 = 13.63636 mi/h (we know 1 foot/s = 0.6818182 mile/h)
Answer:
20 foot/s = 13.63636 mile/h
How to Convert ft/s to mph (Step-by-Step)
Converting feet per second to miles per hour is common in ballistics, wind tunnel data analysis, and physics problems where you need to relate calculations back to everyday driving speeds. The conversion factor is 0.681818 (or exactly 15/22).
- Write down the speed value in feet per second (ft/s).
- Multiply the ft/s value by 0.681818 (or equivalently, multiply by 15 and divide by 22).
- The result is the equivalent speed in miles per hour (mph).
- The factor comes from: 3600 seconds/hour ÷ 5280 feet/mile = 0.681818.
Common ft/s to mph Conversions
Reference table for converting physics calculations and ballistic data from ft/s to everyday road speeds in mph.
| Foot/s | Mile/h |
|---|---|
| 1.47 ft/s | 1 mph |
| 14.67 ft/s | 10 mph |
| 44 ft/s | 30 mph |
| 66 ft/s | 45 mph |
| 88 ft/s | 60 mph |
| 102.67 ft/s | 70 mph |
| 110 ft/s | 75 mph |
| 146.67 ft/s | 100 mph |
| 1125 ft/s | 767 mph |
Solved Examples: ft/s to mph
Question 1: Wind tunnel data shows airflow at 220 ft/s. What is this in mph?
Solution:
Formula: mph = ft/s × 0.681818
= 220 × 0.681818
= 150 mph
Answer: 220 ft/s = 150 mph (hurricane-force wind speed)
Question 2: A bullet exits a pistol at 900 ft/s. What is the muzzle velocity in mph?
Solution:
mph = ft/s × 0.681818
= 900 × 0.681818
= 613.64 mph
Answer: 900 ft/s = 613.64 mph (subsonic pistol round)
Question 3: A physics problem gives a car's speed as 88 ft/s. What road speed is this?
Solution:
mph = ft/s × 0.681818
= 88 × 0.681818
= 60 mph
Answer: 88 ft/s = 60 mph (common freeway speed — a classic textbook value)
Question 4: A roller coaster reaches 176 ft/s at its fastest point. Convert to mph.
Solution:
mph = ft/s × 0.681818
= 176 × 0.681818
= 120 mph
Answer: 176 ft/s = 120 mph (among the fastest roller coasters in the world)
Practice Questions
Try solving these on your own to test your understanding:
- Convert 22 ft/s to mph. (Answer: 15 mph)
- A baseball is pitched at 132 ft/s. What is this in mph? (Answer: 90 mph)
- Convert 100 ft/s to mph. (Answer: 68.18 mph)
- A golf ball launches at 250 ft/s. What is this in mph? (Answer: 170.45 mph)
- Convert 73.3 ft/s to mph. (Answer: 49.98 ≈ 50 mph)
Ballistics and Muzzle Velocity
Firearms ballistics reports muzzle velocity in ft/s. Typical values: .22 LR at 1,050 ft/s (716 mph), 9mm at 1,200 ft/s (818 mph), 5.56 NATO at 3,025 ft/s (2,063 mph), .308 Winchester at 2,800 ft/s (1,909 mph), .50 BMG at 2,910 ft/s (1,984 mph). Converting to mph helps non-specialists grasp how incredibly fast bullets travel — a common pistol round moves faster than a commercial jet. The speed of sound (1,125 ft/s = 767 mph) is the threshold: subsonic rounds stay below, creating less noise with suppressors.
Wind Tunnel Testing
Aerodynamic wind tunnels measure airflow velocity in ft/s in the US. Low-speed tunnels: 50-300 ft/s (34-205 mph) for car and building aerodynamics. High-speed tunnels: 300-900 ft/s (205-614 mph) for aircraft subsonic testing. Transonic tunnels: 900-1,400 ft/s (614-955 mph) for speeds near Mach 1. Supersonic tunnels: 1,400-3,000 ft/s (955-2,045 mph) for fighter aircraft and missiles. Understanding the ft/s to mph conversion helps engineers communicate results to clients who think in everyday speed terms.
Why 88 ft/s = 60 mph Is the Key Reference
This elegant relationship comes from the unit definitions: 60 miles/hour × 5,280 feet/mile ÷ 3,600 seconds/hour = 88 feet/second. The ratio 5280/3600 simplifies to 22/15 (= 1.46667). So every 15 mph equals 22 ft/s: 15 mph = 22 ft/s, 30 mph = 44 ft/s, 45 mph = 66 ft/s, 60 mph = 88 ft/s. Memorizing "88 ft/s = 60 mph" gives you an anchor to estimate any conversion mentally.
Key Takeaways
- Multiply ft/s by 0.681818 (or 15/22) to get mph.
- Quick estimate: multiply ft/s by 2/3 for approximate mph.
- 88 ft/s = 60 mph — the most important reference pair.
- Bullet speeds in ft/s exceed commercial jet speeds in mph.
- Wind tunnel results in ft/s become intuitive when converted to mph.
- Every 22 ft/s equals exactly 15 mph — a clean ratio to remember.
Foot/s to Mile/h Conversion Formula
mile/h = foot/s × 0.6818182
1 foot/s = 0.6818182 mile/h
1 mile/h = 1.4666667 foot/s
Reverse: foot/s = mile/h × 1.4666667
Frequently Asked Questions
How many mile/h are in 1 foot/s?
There are 0.6818182 mile/h in 1 foot/s. To convert foot/s to mile/h, multiply the value by 0.6818182.
How do I convert foot/s to mile/h?
Multiply your foot/s value by 0.6818182 to get the equivalent in mile/h. For example, 5 foot/s = 5 × 0.6818182 = 3.40909 mile/h.
How do I convert mile/h to foot/s?
Multiply your mile/h value by 1.4666667 to get the equivalent in foot/s. Alternatively, divide by 0.6818182.
What is 10 foot/s in mile/h?
10 foot/s is equal to 6.81818 mile/h.
What is 100 foot/s in mile/h?
100 foot/s is equal to 68.18182 mile/h.