Miles Per Hour to Millimeters Per Second (mph to mm/s)
1 mile per hour equals 447.04 millimeters per second exactly.
How to convert miles per hour to millimeters per second
To convert miles per hour to millimeters per second, multiply the number of miles per hour by 447.04. This factor is exact. To go the other way, multiply millimeters per second by 0.002236936292 (rounded).
millimeters per second = miles per hour × 447.04
Example: 10 miles per hour = 4,470.4 millimeters per second.
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
Millimeter Per Second (mm/s)
One thousandth of a meter per second. Used for very slow motion.
Biology and glaciology supply good yardsticks for a millimeter per second. The fastest-swimming bacterium, Thiovulum majus, typically moves at about 0.6 mm/s, and the Jakobshavn Isbrae glacier was recorded flowing at about 0.4 mm/s in 2003. At that rate ice covers roughly 35 meters in a day, because 0.4 mm/s multiplied by 86,400 seconds is about 34.6 m.
Faster, but still slow, is the world record speed of a snail, set in the United Kingdom at 2.75 mm/s, which works out to about 9.9 meters per hour. A millimeter per second is 0.001 m/s, so one meter per second equals 1,000 mm/s. The unit suits slow mechanisms, where meters per second would give awkward decimals, and it sits one step below the centimeter per second in the metric ladder.
1 millimeter per second = 0.001 meters per second (exactly).
Sources: Wikipedia: Orders of magnitude (speed); Wikipedia: Metre per second
Related conversions
- Millimeters per second 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 Mach
- Miles per hour to speed of light
- Miles per hour to centimeters 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 millimeters per second
- Kilometers per hour to millimeters per second
- Knots to millimeters per second
See all speed units.