Convert speed units — km/h, mph, m/s, knots, mach and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ft/s | 1.017e-12 c | |
| 0.01 ft/s | 1.017e-11 c | |
| 0.1 ft/s | 1.017e-10 c | |
| 1 ft/s | 1.0167e-09 c | |
| 5 ft/s | 5.08352e-09 c | |
| 10 ft/s | 1.0167e-08 c | |
| 50 ft/s | 5.08352e-08 c | |
| 100 ft/s | 1.0167e-07 c | |
| 1000 ft/s | 1.0167e-06 c |
Common foot per second values converted to speed of light — factor: 1 ft/s = 1.0167e-9 c
| Foot per Second (ft/s) | Speed of Light (c) | Context |
|---|---|---|
| 1 ft/s | 1.017e-09 c | Very slow |
| 5 ft/s | 5.084e-09 c | Walk |
| 10 ft/s | 1.017e-08 c | Jog |
| 20 ft/s | 2.033e-08 c | Sprint |
| 50 ft/s | 5.084e-08 c | Fast sprint |
| 88 ft/s | 8.947e-08 c | 60 mph car |
| 100 ft/s | 1.017e-07 c | 60 mph car |
| 147 ft/s | 1.495e-07 c | 100 mph car |
| 500 ft/s | 5.084e-07 c | Racing car |
| 880 ft/s | 8.947e-07 c | 600 mph jet |
| 1,000 ft/s | 1.017e-06 c | High-speed jet |
| 1,125 ft/s | 1.144e-06 c | Speed of sound |
| 2,200 ft/s | 2.237e-06 c | Rifle bullet |
| 3,000 ft/s | 3.050e-06 c | Fast bullet |
| 5,000 ft/s | 5.084e-06 c | Rocket |
Converting foot per second to speed of light is essential for drivers, pilots, engineers, and scientists working across different measurement systems. Road speed limits, aviation airspeed, nautical navigation, and physics calculations each use different speed units, making quick and accurate conversion a practical everyday skill.
Key reference points: 5 ft/s = 5.0835e-9 c and 10 ft/s = 1.0167e-8 c. At higher speeds, 100 ft/s = 1.0167e-7 c. For reverse conversion, multiply c values by 9.836e+08 to get back to ft/s.
All conversions use the internationally recognized factor of exactly 1 ft/s = 1.0167e-9 c. Calculations are performed in IEEE 754 double-precision floating point, giving accuracy to at least 8 significant figures — more than sufficient for any practical application.
Formula: Speed of Light = Foot per Second × 1.0167e-9
Multiply any foot per second value by 1.0167e-9 to get speed of light. One foot per second equals 1.0167e-9 c.
Reverse: Foot per Second = Speed of Light × 9.836e+08
1 ft/s = 1.0167e-9 c. Memorize this for instant mental estimates.
Use 1.0167e-9 as a quick mental multiplier.
To verify: multiply your result by 9.836e+08 to recover the original ft/s value.
Rates bullet muzzle velocity in feet per second for ammunition comparisons.
Measures duct air velocity in feet per second for airflow design.
Evaluates arrow speed in fps to optimize bow setup and shooting form.
Sets character movement speeds in fps for physics-based game engines.
Calculates water hammer and pipe flow velocities in ft/s.
References pitch speed, puck speed, and serve speed in fps for broadcast.
Feet per second is an Imperial unit of speed equal to exactly 0.3048 m/s. It was in common use in Britain and America from the 17th century, particularly in ballistics and military applications.
ft/s remains the standard in US ballistics: bullet velocities, muzzle speeds, and arrow velocities are universally quoted in feet per second. It also appears in HVAC airflow measurements and some engineering contexts.
Interesting fact: A typical rifle bullet travels at 900-1,200 ft/s (270-370 m/s). The speed of sound at sea level is approximately 1,125 ft/s.
The speed of light in a vacuum, denoted c, is exactly 299,792,458 m/s — a defined constant since 1983 when the meter was redefined in terms of it. The symbol c comes from the Latin celeritas (swiftness).
Einstein's special relativity (1905) established c as the ultimate speed limit of the universe. No object with mass can reach c; only massless particles like photons travel at exactly the speed of light.
Interesting fact: Light from the Sun takes 8 minutes 20 seconds to reach Earth. Light from the nearest star (Proxima Centauri) takes 4.24 years. The Voyager 1 spacecraft, the farthest human-made object, travels at just 0.000057c.