Convert Mach 1 to Knots
Convert Mach 1 (Ma) to Knots (kn) instantly and accurately.
Conversion Formula
kn = Ma × 661.4708423
About Mach 1
Mach 1 = the speed of sound in dry air at ISA sea-level (15°C, 101.325 kPa) = exactly 340.29 m/s (1,225 km/h; 761 mph). Chuck Yeager first exceeded it on 14 October 1947 in the Bell X-1. At 35,000 ft cruise altitude (−56.5°C), it falls to 295.1 m/s. Flight regimes: subsonic
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.
Quick Reference Table
| Mach 1 (Ma) | Knots (kn) |
|---|---|
| 1 Ma | 661.471 kn |
| 2 Ma | 1322.94 kn |
| 5 Ma | 3307.35 kn |
| 10 Ma | 6614.71 kn |
| 25 Ma | 16536.8 kn |
| 50 Ma | 33073.5 kn |
| 100 Ma | 66147.1 kn |