Miles Per Hour to Mach (mph to Ma)
1 mile per hour equals 0.001313687576 Mach (rounded).
How to convert miles per hour to Mach
To convert miles per hour to Mach, multiply the number of miles per hour by 0.001313687576. The factor is rounded to 10 significant digits. To go the other way, multiply Mach by 761.2159986 (rounded).
Mach = miles per hour × 0.001313687576
Example: 10 miles per hour = 0.01313687576 Mach.
Approximate value. Standards for the Mach varied by place and period, so this converter uses the most commonly cited value. Treat results as estimates, not exact figures.
About these units
Mile Per Hour (mph)
Exactly 0.44704 m/s. The unit for road speeds in the US, UK and a few other countries.
Early British motoring law is the best window into this unit. The 1861 Locomotive Act set a limit of 10 mph for light locomotives. The 1865 Red Flag Act cut it to 4 mph in the country and 2 mph in towns, with a person walking ahead with a flag. The Locomotives on Highways Act of 1896 raised it to 14 mph, and the Motor Car Act of 1903 to 20 mph. In 1931 all limits for cars were abolished, and 30 mph in built-up areas returned in 1935.
The mile per hour combines the mile, set at 5,280 feet in Elizabeth I's reign, with the hour, and it equals exactly 0.44704 m/s or 1.609344 km/h. The United Kingdom and United States use it on roads, along with several smaller countries, mostly territories or former territories of those two, and the US, Canada and Ireland use it for rail. Sports such as cricket, tennis and baseball quote ball speeds in it. Aviation and shipping prefer knots, about 0.869 of one mph each.
1 mile per hour = 0.44704 meters per second (exactly).
Sources: Wikipedia: Miles per hour; Wikipedia: Speed limits in the United Kingdom; Wikipedia: Mile
Mach (Ma)
The speed of sound at sea level in standard conditions (15 °C): about 340.294 m/s or 1,225 km/h. The speed of sound varies with temperature and altitude.
Ernst Mach, the Austrian physicist and philosopher born in Moravia in 1838, never defined a unit of speed, yet the ratio carries his name. In 1887 he and Peter Salcher presented a paper on photographing processes in air caused by projectiles, including a shadowgraph of the bow shock around a supersonic bullet fired from a Werndl carbine. The ratio of flow speed to the local speed of sound was later named for him.
Mach is therefore a dimensionless number, not a fixed speed, and because the speed of sound depends on temperature, so does Mach 1. It is about 340 m/s (1,225 km/h) in dry air at 15 °C at sea level, 343 m/s at 20 °C, and about 295 m/s above 11 kilometers where the air is cold. Flight is called subsonic below 0.8, transonic from 0.8 to 1.2, supersonic from 1.2 to 5 and hypersonic from 5 to 10. On 14 October 1947 Chuck Yeager flew the Bell X-1 to Mach 1.06, reported as 361 m/s.
1 Mach = 340.294 meters per second (approximately).
Sources: Wikipedia: Mach number; Wikipedia: Ernst Mach; Wikipedia: Speed of sound
Related conversions
- Mach to miles per hour (reverse)
- Miles per hour to meters per second
- Miles per hour to kilometers per hour
- Miles per hour to knots
- Miles per hour to feet per second
- Miles per hour to speed of light
- Miles per hour to centimeters per second
- Miles per hour to millimeters per second
- Miles per hour to kilometers per second
- Miles per hour to kilometers per minute
- Miles per hour to meters per minute
- Miles per hour to inches per second
- Miles per hour to feet per minute
- Meters per second to Mach
- Kilometers per hour to Mach
- Knots to Mach
- Feet per second to Mach
- Speed of light to Mach
See all speed units.