Convert Mach (M) to Kilometers per Second (km/s)
≈ 11/32 km/s
At about 20°C in dry air, Mach 1 is approximately 0.343 kilometers per second. Multiply the Mach number by 0.343; the exact speed varies with air temperature and altitude because Mach is defined relative to the local speed of sound.
Conversion Formula
Reverse: M = km/s ÷ 0.343
Conversion Examples
Mach to Kilometer per Second Table
| Mach (M) | Kilometer per Second (km/s) | Fraction |
|---|---|---|
| 1 | 0.343 | 11/32 |
| 2 | 0.686 | 11/16 |
| 3 | 1.029 | 1 1/32 |
| 4 | 1.372 | 1 3/8 |
| 5 | 1.715 | 1 23/32 |
| 6 | 2.058 | 2 1/16 |
| 7 | 2.401 | 2 13/32 |
| 8 | 2.744 | 2 3/4 |
| 9 | 3.087 | 3 3/32 |
| 10 | 3.43 | 3 7/16 |
| 11 | 3.773 | 3 49/64 |
| 12 | 4.116 | 4 7/64 |
| 13 | 4.459 | 4 29/64 |
| 14 | 4.802 | 4 51/64 |
| 15 | 5.145 | 5 9/64 |
| 16 | 5.488 | 5 31/64 |
| 17 | 5.831 | 5 53/64 |
| 18 | 6.174 | 6 11/64 |
| 19 | 6.517 | 6 33/64 |
| 20 | 6.86 | 6 55/64 |
Unit Definitions
What is a Mach (M)?
Mach is a dimensionless ratio of an object’s speed to the local speed of sound.
History
The Mach number is named after physicist Ernst Mach and became a standard measure in aerodynamics and high-speed flight.
Current Use
Mach is used in aviation, aerospace engineering, ballistics and compressible-flow research.
Learn more about MachWhat is a Kilometer per Second (km/s)?
A kilometer per second is a metric speed equal to 1,000 meters traveled in one second.
History
The unit derives directly from the SI-defined meter and second and is useful for very high speeds.
Current Use
Kilometers per second are used for spacecraft, astronomical motion, meteors and other high-speed phenomena.
Learn more about Kilometer per Second