Miles per hour

Miles per hour (mph) is a unit of speed equal to one mile traveled in one hour. It is used chiefly for measuring vehicle speeds and travel rates.

Speed: Speed is the distance an object travels per unit of time. Miles per hour is one specific unit for expressing speed.
Speed limit: A speed limit is the maximum legal speed allowed on a particular road or in an area. Road limits in the United States and United Kingdom are commonly posted in mph.
Kilometres per hour: Kilometres per hour (km/h) is a speed unit equal to one kilometre traveled in one hour. It is the common road-speed alternative to mph in most countries.
Unit conversion: Unit conversion expresses a measurement in a different unit without changing its physical quantity. Converting mph to km/h uses the fixed relationship between miles and kilometres.
Mile: A mile is a unit of length equal to 5,280 feet or 1,609.344 metres. It supplies the distance unit in miles per hour.
Speedometer: A speedometer is an instrument that displays a vehicle's speed. Many speedometers show mph, sometimes alongside kilometres per hour.
Metres per second: Metres per second (m/s) is a speed unit equal to one metre traveled in one second. It is the SI unit of speed, unlike the customary mile-based mph.
Average speed: Average speed is total distance traveled divided by total elapsed time. An mph average summarizes motion across an interval, not at one instant.
Hour: An hour is a unit of time equal to 60 minutes or 3,600 seconds. It supplies the time interval in miles per hour.
Automobile: An automobile is a road vehicle designed primarily to carry people and powered by an engine or electric motor. Automobile speeds are commonly measured and communicated in mph in some countries.

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KnotCompared with: Its mile is shorter than a nautical mile, so equal numerical speeds differ.