Convert Knots to Miles per Second
Convert Knots (kn) to Miles per Second (mi/s) instantly and accurately.
Conversion Formula
mi/s = kn × 0.0003196609578
About Knots
A knot (kn) = 1 nautical mile per hour = 1,852/3,600 m/s ≈ 0.51444 m/s - the universal speed unit for aviation and maritime navigation (ICAO and IMO standard). GA aircraft cruise 100-140 kn; commercial airliners 450-480 kn; Concorde 1,176 kn (Mach 2). Container ships 18-22 kn; QM2 exceeds 30 kn. Beaufort Force 12 hurricane begins at 64 kn. Gulf Stream surface current 2-4 kn. 1 kn = 1.852 km/h = 1.15078 mph.
About Miles per Second
A mile per second (mi/s) = exactly 1,609.344 m/s - above the fastest air-breathing aircraft. NASA X-43A scramjet: 2.9 km/s ≈ 1.8 mi/s (Mach 9.6). Earth's orbital speed around the Sun: ~18.5 mi/s (29.8 km/s). Light travels ~186,282 mi/s in vacuum - the classic imperial figure still used in popular astronomy. Tunguska impactor entered Earth's atmosphere at ~9-11 mi/s. 1 mi/s = 3,600 mph = 3,128.3 kn.
Quick Reference Table
| Knots (kn) | Miles per Second (mi/s) |
|---|---|
| 1 kn | 0.000319661 mi/s |
| 2 kn | 0.000639322 mi/s |
| 5 kn | 0.0015983 mi/s |
| 10 kn | 0.00319661 mi/s |
| 25 kn | 0.00799152 mi/s |
| 50 kn | 0.015983 mi/s |
| 100 kn | 0.0319661 mi/s |