Convert miles per hour to kilometers per hour

Enter the number of miles per hour you want to convert to kilometers per hour in the text box below. The conversion to speed in kilometers per hour will update as you type.

Answer: 1.6093
miles per hour (mph)
{"answerString":"1.609","answerSymbol":"kilometers per hour"}
1 miles per hour = 1.609 kilometers per hour

Precise decimal and fraction answers

The conversion in kilometers per hour rounded to six significant decimal places is 1 mph = 1.609344 km/h. The precise fraction answer is 1 613/1006 km/h.

Decimal Precision

Conversion from one to ten decimal places

  • 1 mph = 1.6 km/h
  • 1 mph = 1.61 km/h
  • 1 mph = 1.609 km/h
  • 1 mph = 1.6093 km/h
  • 1 mph = 1.60934 km/h
  • 1 mph = 1.609344 km/h
  • 1 mph = 1.6093440 km/h
  • 1 mph = 1.60934400 km/h
  • 1 mph = 1.609344000 km/h
  • 1 mph = 1.6093440000 km/h

How many kilometers per hour is a mile per hour?

1.609 kilometers per hour is the same velocity as one mile per hour. A mile per hour is 1.609 times faster than a kilometer per hour. An object traveling at one kilometer per hour kilometer per hour has 62.14% of the velocity of an object moving at one mile per hour.

Miles per hour to kilometers per hour conversion factor and formulas


The conversion factor between miles per hour and kilometers per hour is 1.609. This represents the ratio of kilometers per hour per one mile per hour. To calculate the value in kilometers per hour, we can either multiply by the conversion factor or divide by its inverse.


To convert from miles per hour to kilometers per hour, multiply miles per hour by 1.609.
The formula is expressed as:
mph × 1.609 = km/h


Alternatively we can divide by the inverse conversion factor to get the same result.
The inverse of 1.609 is 1/1.609 or 0.621. To convert from miles per hour to kilometers per hour, divide miles per hour by 0.621.
The formula is expressed as:
mph ÷ 0.621 = km/h

About this conversion

Converting miles per hour to kilometers per hour is a conversion between units from separate unit systems - miles per hour are US Customary / UK Imperial defined units while kilometers per hour are metric (SI) .

About Miles per hour

Customary/Imperial Unit

Miles per hour is a velocity measurement within the US/UK Imperial systems. It is defined as the number of miles traveled in one hour. MPH is frequently used for measurement and regulation of vehicle speed limits in the US, UK and many British dependencies. The common symbols for miles per hour are mph, MPH or mi/hr.

About Kilometers per hour

SI Unit

Within the SI (metric) system of measurement, a kilometer per hour (km/h) is the distance traveled in one hour as measured in kilometers (1,000 meters). It is commonly used as measurement of velocity over geographic distances. Kilometers per hour are commonly used to measure vehicle speed and speed limits. The official SI symbol is km/h, however kph and km/hr are also used.

Reverse this conversion

Convert from kilometers per hour to miles per hour instead.

1 miles per hour to other speed units


  • 1 mph = 1.609 km/h


  • 1 mph = 1 mph
  • 1 mph = 0.869 kn

References and Citations

  1. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement
  2. International Bureau of Weights and Measures (BIPM) The International System of Units (SI)

Miles per hour to kilometers per hour conversion table

mph km/h
1 mph 1.609 km/h
2 mph 3.219 km/h
3 mph 4.828 km/h
4 mph 6.437 km/h
5 mph 8.047 km/h
6 mph 9.656 km/h
7 mph 11.265 km/h
8 mph 12.875 km/h
9 mph 14.484 km/h
10 mph 16.093 km/h
mph km/h
20 mph 32.187 km/h
30 mph 48.28 km/h
40 mph 64.374 km/h
50 mph 80.467 km/h
60 mph 96.561 km/h
70 mph 112.654 km/h
80 mph 128.748 km/h
90 mph 144.841 km/h
100 mph 160.934 km/h
1,000 mph 1,609.344 km/h

More mph to km/h conversions

Frequent conversions from miles per hour