Convert Mile per Hour (mph) to Mach (M) instantly. Enter any value — result updates live.
Converting Mile per Hour to Mach is a common speed conversion. One mile per hour (mph) equals 0.00131370302 mach (M). Miles per hour are used for speed limits and weather in the US and UK.
This conversion is commonly needed for running and fitness tracking, aviation and flight planning, sailing and marine navigation. Mach numbers express speed relative to the speed of sound, used in aviation and aerospace.
To put mile per hour in perspective: a US highway speed limit (65–75 mph). In mach, common references include a bullet from a rifle (about Mach 2.5).
Even though the UK uses miles for road speed limits, it uses kilometers for most other measurements — a split that dates back to an incomplete 1965 metrication effort.
Mach numbers are named after Austrian physicist Ernst Mach. The exact speed of Mach 1 varies with temperature and altitude.
People frequently convert between mile per hour and mach for:
| Mile per Hour (mph) | Mach (M) |
|---|---|
| 1 mph | 0.00131370302 M |
| 2 mph | 0.00262740604 M |
| 5 mph | 0.00656851509 M |
| 10 mph | 0.0131370302 M |
| 15 mph | 0.0197055453 M |
| 20 mph | 0.0262740604 M |
| 25 mph | 0.0328425755 M |
| 30 mph | 0.0394110905 M |
| 50 mph | 0.0656851509 M |
| 100 mph | 0.131370302 M |
| 200 mph | 0.262740604 M |
| 500 mph | 0.656851509 M |
| 1000 mph | 1.3137 M |