![]() Although the metre was formally defined in 1799, the term "kilometres per hour" did not come into immediate use – the myriametre (10,000 metres) and myriametre per hour were preferred to kilometres and kilometres per hour. Worldwide, it is the most commonly used unit of speed on road signs and car speedometers. The kilometre per hour (American English: kilometer per hour) is a unit of speed, expressing the number of kilometres travelled in one hour. Source: Wikipedia Topic: mile per hour Kilometer per hour Although kilometres per hour is now the most widely used measure of speed, miles per hour remains the standard unit for speed limits in the United States, the United Kingdom, Antigua & Barbuda and Puerto Rico, although the latter two use kilometres for long distances. Miles per hour (abbreviated mph, MPH or mi/h) is an imperial and United States customary unit of speed expressing the number of statute miles covered in one hour. A car begins heading along a path at 50 mph. ![]() To remember this conversion factor you can also think that 1 mile1.60934 kilometer, and since MPH is mile per hour, you just need to multiply the MPH with 1.60934 to convert it to km/h. In other words, the value in mph multiply by 1.6093440006147 to get a value in km/h. For example, if you wanted to convert 50 MPH to km/h, you would use the formula: 50 MPH 1.60934 80.467 km/h. Therefore, 1 mile is equivalent to 1.609344 kilometers. Conversion miles per hour to kilometers per hour, mph to km/h. This is how they are defined: Mile per hour The units are defined as follows: An object moving at 1 mph per hour will cover a distance of one mile. The units involved in this conversion are miles per hour and kilometers per hour. Conversion table miles per hour to kilometers per hour chartįor quick reference purposes, below is the conversion table you can use to convert from miles per hour to kilometers per hour miles per hour (mph) ![]() We can say that fifty miles per hour is approximately eighty point four six seven kilometers per hour:Īn alternative is also that one kilometer per hour is approximately zero point zero one two times fifty miles per hour. In this case 1 kilometer per hour is equal to 0.012427423844757 × 50 miles per hour.Īnother way is saying that 50 miles per hour is equal to 1 ÷ 0.012427423844757 kilometers per hour.įor practical purposes we can round our final result to an approximate numerical value. The most economical speed is said to be 65-80 km/h. When travelling at 110 km/h you use approximately 30 per cent more gasoline than at 80 km/h, in the same gear. We can also convert by utilizing the inverse value of the conversion factor. Driving a motor vehicle at 60 kilometers per hour in third gear can use 25 per cent more fuel than driving at the same speed in fifth gear (RAC, UK).
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