Miles per hour to Kilometers per hour Converter

1. How many Kilometers per hour equal one Mile per hour?
2. Difference between Miles per hour and Kilometers per hour
3. How to convert Miles per hour to Kilometers per hour
4. Mph to kph conversion table

    How many Kilometers per hour equal one Mile per hour?

A speed of exactly 1.609344 kilometers per hour equals one mile per hour, and this follows from the definition of a mile as 5280 feet, of a feet as 0.3044 meters, and of a kilometer as 1,000 meters and performing the necessary mathematical operations. These are internationally agreed upon unit definitions established by treaty in 1959. The internationally recognized symbol for mile is "mi", and "km" for kilometer and "per hour" is usually abbreviated to "ph" leading to "mph" and "kmph", but some people do use "kph" instead.

    Difference between Miles per hour and Kilometers per hour

The mile and the kilometer are both units used for measuring distances of comparable magnitude, e.g. distances one would travel by car, truck, train, or plane. When talking about speed these are suffixed by "per hour" to indicate the distance covered in a unit of time. The difference between the to units is that mph is based on the mile, which is a part of the imperial system while kmph is based on the kilometer which is a part of the modern metric system. The kilometer is used in most countries in the world, while miles are only used in several countries like the US and the UK, and their territories.

Miles have a long history, for example we know of the Roman mile back in the days of the Roman Empire. At different times and in different places there were different definitions of the mile and it equaled different distances, e.g. Italian mile, English mile, Scot mile, Irish mile.

    How to convert Miles per hour to Kilometers per hour

For any speed measurement unit we need to account for both the time dimension and the distance dimension, but since the time unit is hours in both cases, we can ignore. Thus, to convert miles per hour to kilometers per hour simply multiply the speed in mph by 1.609344. This mathematical operation is usually hard to do, so calculators are employed when one needs to do a precise conversion. The conversion of speed in miles per hour to a speed in kilometers per hour is easier with our online converter above, which also have a quick copy function.

Miles per hour to km per hour conversion example

Sample task: convert 100 miles per hour to kilometers per hour. Solution:

Formula:
mph * 1.609344 = kmph
Calculation:
100 mph * 1.6093 = 160.9344 kmph
End result:
100 mph is equal to 160.9344 kmph

    Mph to kph conversion table