The speed of sound is often expressed in meters per second but can also be converted to kilometers per hour. This unit is often referred to as kilometer-hour, kilometre per hour or used as an abbreviation km/h, kph,kmph, km/hr. This unit of measurement for speed is a multiple of the meter per second within the international system of units. Take for example a car traveling at a speed of 150 km/h, what will be its speed in mph using the method of conversion by division?ġ50 km/h / 1.609344 = 93.2056788 or when rounded to 93.21 mph How much is 1 mph in km/hġ mph = 1.609344 km/h How much is 1 km/h in mphġ km/h = 0.621371 mph The kilometer per hourĪs the name suggests, the kilometer per hour is used to measure the number of kilometers traveled in an hour. Kilometer per hour divided by 1.609344 equal Mile per hour Example Kilometer per hour multiplied by 0.621371 equals Mile per hour Take for example a car traveling at a speed of 80 mph, what will be its speed in km/h using the conversion method by multiplication?Ĩ0 mph x 1.609344 = 128.74752 or when rounded to 128.75 km/h Convert from km/h to mph Mile per hour divided by 0.621371 equal kilometer per hour Example Mile per hour multiplied by 1.609344 equals kilometer per hour Calculating the speed which, when based on the same time, will give the same conversion multiple. Mile to Kilometer Conversion Table Mile ġ5 mi, mi(Int) = 15 × 1.609344 km = 24.Kilomètre par heure (km/h) Formula for converting mph to km/hĬonsider that each mile unit equals to 1.609344 kilometers. Unlike the United States, the UK has adopted the metric system while the metric system is widely used in government, commerce, and industry, remnants of the imperial system can still be seen in the UK's use of miles in its road systems. However, there still remain a number of countries that primarily use the mile instead of the kilometer including the United States and the United Kingdom (UK). This definition is subject to change, but the relationship between the meter and the kilometer will remain constant.Ĭurrent use: It is currently the official unit of measurement for expressing distances between geographical places on land in most of the world. The origin of the kilometer is linked to that of the meter, and its current definition as the distance traveled by light in 1/299 792 458 second. One kilometer is therefore one thousand meters. History/origin: The prefix kilo- is a metric prefix indicating one thousand. One kilometer is equivalent to 0.6214 miles. Kilometerĭefinition: A kilometer (symbol: km) is a unit of length in the International System of Units (SI). There also exist a number of units based on, or closely related to, the Roman mile, including the nautical mile (1.852 km exactly), Italian mile (~1.852 km), and the Chinese mile (500m exactly).Ĭurrent use: Although most countries have adopted the metric system and use kilometers, rather than miles, to express land distance, the mile is still prevalently used in countries such as the United States (US), United Kingdom (UK), Myanmar, and Liberia, as well as some other countries which are either US or UK territories, or have historical ties with either country. The definition of a mile as 5,280 feet (or 8 furlongs), sometimes referred to as the statute mile, international mile, or land mile, which differs from the Roman mile of 5,000 feet, developed due to the importance of the furlong in England, back in 1593. The use of the abbreviation "m" for mile was common before the widespread adoption of the metric system after the adoption of the metric system, "mi" became the preferred abbreviation in order to avoid confusion between miles and meters. History/origin: The mile is an English unit (predecessor of Imperial units and United States Customary Units) of length. It is currently defined as 5,280 feet, 1,760 yards, or exactly 1,609.344 meters. Definition: A mile (symbol: mi or m) is a unit of length in the imperial and US customary systems of measurement.
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