Mach (Ma) to Knots (kn) Conversion
Mach
The Mach number represents the ratio of an object's speed to the local speed of sound. Mach 1 is approximately 343 m/s (1,235 km/h) at sea level and 20 °C, but varies with temperature and altitude. Named after Austrian physicist Ernst Mach, the Mach number is fundamental in aerodynamics: subsonic is below Mach 0.8, supersonic from Mach 1.2 to 5, and hypersonic above Mach 5.
Knots
The knot is a unit of speed equal to exactly one nautical mile per hour (1.852 km/h), the standard unit for maritime and aerial navigation worldwide. Its name derives from the historical practice of measuring ship speed using a knotted rope thrown overboard. Because the nautical mile is tied to the Earth's geometry (one arcminute of latitude), a ship at 1 knot crosses one arcminute of latitude per hour.
| Mach (Ma) | Knots (kn) |
|---|---|
| 0.1 Ma | 66.6739 kn |
| 1 Ma | 666.7387 kn |
| 2 Ma | 1,333.4773 kn |
| 3 Ma | 2,000.216 kn |
| 5 Ma | 3,333.6933 kn |
| 10 Ma | 6,667.3866 kn |
| 20 Ma | 13,334.7732 kn |
| 30 Ma | 20,002.1598 kn |
| 50 Ma | 33,336.933 kn |
| 100 Ma | 66,673.8661 kn |
| 1000 Ma | 666,738.6609 kn |
Frequently Asked Questions (FAQ)
How many knots are in 1 Mach?
1 Mach (Ma) is exactly 666.739 knots (kn).
How do I convert Mach to knots?
Multiply the value in Mach by 666.739 to get the result in knots. Or use the converter above — type any number and see the result instantly.