Imperial Speed Unit Converter
Feet Per Second Calculator
Convert between feet per second (fps), miles per hour (mph), kilometers per hour (km/h), and meters per second (m/s). Essential for physics, ballistics, and engineering.
FPS Converter
Enter a value and select the input unit
Common Speeds in Feet Per Second
| Speed | FPS | MPH | Context |
|---|---|---|---|
| Human walking | 3 fps | 2.0 mph | Average walking pace |
| Human running | 15 fps | 10.2 mph | Jogging speed |
| Usain Bolt max | 22 fps | 15.0 mph | World record sprint |
| City driving (30 mph) | 44 fps | 30.0 mph | Urban speed limit |
| Highway (60 mph) | 88 fps | 60.0 mph | Typical highway speed |
| Baseball fastball | 120 fps | 81.8 mph | Professional pitcher |
| 100 mph | 147 fps | 100.2 mph | High-speed driving |
| Bullet train | 400 fps | 272.7 mph | High-speed rail |
| Commercial jet | 700 fps | 477.3 mph | Cruising speed |
| Speed of sound | 1125 fps | 767.0 mph | Mach 1 at sea level |
| Rifle bullet | 2200 fps | 1500.0 mph | High-velocity round |
| Orbital velocity | 25000 fps | 17045.5 mph | ISS orbital speed |
Understanding Feet Per Second
Feet per second (fps or ft/s) is an imperial unit of speed measuring how many feet an object travels in one second. It's commonly used in:
- Ballistics - Measuring bullet and projectile velocities
- Physics - Calculating motion in imperial units
- Engineering - Fluid dynamics and mechanical systems
- Sports - Baseball pitch speed, golf ball speed
- Aviation - Some airspeed calculations
The unit provides finer granularity than mph for short-distance measurements and is the imperial equivalent of meters per second (m/s).
Conversion Formulas
or fps ÷ 1.46667
or mph ÷ 0.681818
Since 1 foot = 0.3048 meters
or m/s ÷ 0.3048
Frequently Asked Questions
Common questions about feet per second conversions
How do you convert feet per second to mph?
To convert feet per second (fps) to miles per hour (mph), multiply by 0.681818. For example, 100 fps × 0.681818 = 68.18 mph.
What is 100 feet per second in mph?
100 feet per second equals 68.18 mph (miles per hour). This is slightly above typical highway speed limits.
How fast is the speed of sound in feet per second?
The speed of sound in air at sea level and 20°C is approximately 1,125 feet per second (343 meters per second or 767 mph). This is known as Mach 1.
Why use feet per second instead of mph?
Feet per second is commonly used in physics, ballistics, and engineering because it provides finer granularity for measuring short-distance speeds. It's also the imperial equivalent of meters per second (m/s).
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