Millimeters Per Second to Miles Per Hour (mm/s to mph)
1 millimeter per second equals 0.002236936292 miles per hour (rounded).
How to convert millimeters per second to miles per hour
To convert millimeters per second to miles per hour, multiply the number of millimeters per second by 0.002236936292. The factor is rounded to 10 significant digits. To go the other way, multiply miles per hour by 447.04.
miles per hour = millimeters per second × 0.002236936292
Example: 10 millimeters per second = 0.02236936292 miles per hour.
About these units
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
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
Related conversions
- Miles per hour to millimeters per second (reverse)
- Millimeters per second to meters per second
- Millimeters per second to kilometers per hour
- Millimeters per second to knots
- Meters per second to miles per hour
- Kilometers per hour to miles per hour
- Knots to miles per hour
- Feet per second to miles per hour
- Mach to miles per hour
- Speed of light to miles per hour
- Centimeters per second to miles per hour
- Kilometers per second to miles per hour
- Kilometers per minute to miles per hour
- Meters per minute to miles per hour
- Inches per second to miles per hour
- Feet per minute to miles per hour
See all speed units.