Select Mach from speed or Speed from Mach. Use mph, km/h, m/s, ft/s or knots with standard sea level, custom dry-air temperature or standard-atmosphere geopotential altitude from 0 to 20 km.
Miles to Mach Formula
The following formulas convert miles per hour to Mach and back, either at standard sea level or using the general definition with the local speed of sound.
- Standard sea level (15ยฐC): a โ 340.29 m/s โ 761.2 mph.
- mph to m/s: 1 mph = 0.44704 m/s.
- Definition: Mach (M) = speed รท speed of sound (v รท a).
- Inverse: speed = Mach ร a.
Miles to Mach Conversion Table
| Miles per hour (mph) | Mach |
|---|---|
| 60 | 0.079 |
| 100 | 0.131 |
| 200 | 0.263 |
| 300 | 0.394 |
| 400 | 0.525 |
| 500 | 0.657 |
| 600 | 0.788 |
| 700 | 0.919 |
| 750 | 0.985 |
| 761.2 | 1.000 |
| 800 | 1.051 |
| 900 | 1.182 |
| 1000 | 1.314 |
| 1200 | 1.576 |
| 1500 | 1.971 |
| 1800 | 2.365 |
| 2000 | 2.628 |
| 2500 | 3.284 |
| 3000 | 3.941 |
| 5000 | 6.568 |
| * Standard sea level (15ยฐC): 1 Mach โ 761.2 mph (โ 340.29 m/s). | |
How do you convert miles per hour to Mach? Divide mph by the speed of sound in mph (โ 761.2 at 15ยฐC sea level), or more generally use Mach = v รท a with a based on temperature/altitude.
How do you convert Mach to miles per hour? Multiply Mach by the local speed of sound (in mph), which depends on the environment; at 15ยฐC sea level, mph โ Mach ร 761.2.
Example Problem
Convert 1,200 mph to Mach at standard sea level (15ยฐC).
Use the formula: Mach = v รท a, where a โ 761.2 mph at sea level.
Mach = 1200 รท 761.2 โ 1.576
