How to convert kilometers per hour to miles per hour
To convert a measurement in kilometers per hour to miles per hour, multiply the value by 0.621371192237. The conversion factor comes from the relationship between both units and the meter per second.
For example, to convert 5 km/h to miles per hour: 5 × 0.621371192237 = 3.106856 mph.
What is a kilometer per hour?
The kilometer per hour is a metric unit of speed equal to one kilometer traveled in one hour, or exactly 1/3.6 meters per second. Km/h became the standard for road speed limits in most of the world as motor vehicles spread in the 20th century, pairing naturally with the metric system's kilometer.
Common uses of kilometers per hour include: Road speed limits in most countries; Vehicle speedometers worldwide; Weather reports for wind speed; Cycling and running pace tracking.
What is a mile per hour?
The mile per hour is an imperial unit of speed equal to one mile traveled in one hour, or exactly 0.44704 meters per second. Mph remains the standard for road speed in the United States and United Kingdom, a legacy of the imperial mile that predates widespread metric adoption elsewhere.
Common uses of miles per hour include: Road speed limits in the US and UK; Vehicle speedometers in imperial countries; Wind and storm speed reporting (US); Baseball pitch and sports speeds.
When you need to convert kilometers per hour to miles per hour
Drivers, cyclists, and travelers crossing between metric and imperial countries constantly convert km/h to mph. Reading a 100 km/h motorway sign as about 62 mph makes an unfamiliar limit instantly understandable.
Kilometers per hour to miles per hour worked examples
Here are some common values converted:
1 km/h = 0.621371192237 mph 5 km/h = 3.106856 mph 10 km/h = 6.213712 mph 50 km/h = 31.06856 mph 100 km/h = 62.137119 mph
Frequently asked questions
How many miles per hour are in one kilometer per hour?
One kilometer per hour (km/h) equals 0.621371192237 miles per hour (mph). Multiply any value in kilometers per hour by 0.621371192237 to convert to miles per hour.
How do I convert kilometers per hour to miles per hour?
Multiply the value in kilometers per hour by 0.621371192237. For example, 5 km/h × 0.621371192237 = 3.106856 mph.
How do I convert miles per hour to kilometers per hour?
Multiply the value in miles per hour by 1.609344, or divide by 0.621371192237. Use the swap button on the converter above to reverse the direction.
Is the kilometer per hour to mile per hour conversion exact?
Conversions between m/s, km/h, mph, knots and ft/s are exact by definition. Mach uses the speed of sound at sea level and 15°C (340.29 m/s), which varies with temperature and altitude.
What is the formula for kilometers per hour to miles per hour?
The formula is: mph = km/h × 0.621371192237. This comes from the definition of both units relative to the meter per second.