Convert Miles per hour per second to Knots per second
Convert Miles per hour per second (mph/s) to Knots per second (kn/s) instantly and accurately.
Conversion Formula
kn/s = mph/s × 0.8689762419
About Miles per hour per second
The mile per hour per second (mph/s) equals exactly 0.44704 m/s², the natural acceleration unit for road vehicles in the US and UK where speed is measured in mph. A 0-60 mph time of 2.0 s (Tesla Model S Plaid) gives 30 mph/s ≈ 13.4 m/s²; a typical family car at 8.5 s gives 7.1 mph/s ≈ 3.2 m/s². Emergency braking for Amtrak trains requires at least 26 mph/s ≈ 11.6 m/s². 1 mph/s = 0.44704 m/s² (exact) ≈ 4.56 × 10⁻² g₀.
About Knots per second
The knot per second (kn/s) equals 1852/3600 m/s² ≈ 0.5144 m/s², used in aviation and maritime operations where speed is measured in knots. Aircraft carrier catapult launches accelerate an F/A-18 from 0 to ~150 kn in 2-2.5 s, giving 60-75 kn/s ≈ 31-39 m/s². A commercial jet rejected takeoff from V1 (~145 kn) to rest in ≈25 s decelerates at 5-6 kn/s ≈ 2.6-3.1 m/s². 1 kn/s = 463/900 m/s² ≈ 5.25 × 10⁻² g₀.
Quick Reference Table
| Miles per hour per second (mph/s) | Knots per second (kn/s) |
|---|---|
| 1 mph/s | 0.868976 kn/s |
| 2 mph/s | 1.73795 kn/s |
| 5 mph/s | 4.34488 kn/s |
| 10 mph/s | 8.68976 kn/s |
| 25 mph/s | 21.7244 kn/s |
| 50 mph/s | 43.4488 kn/s |
| 100 mph/s | 86.8976 kn/s |