Online calculator to convert miles per hour to kilometers per hour (mph to km/h) with formulas, examples, and tables. Our conversions provide a quick and easy way to convert between Speed or Velocity units.
Conversion Calculator
Enter your value in the conversion calculator below.
Convert mph to km/h
TIP: If the result of your conversion is 0, try increasing the "Decimals".
Conversion Definitions
The following is a list of definitions relating to conversions between miles per hour and kilometers per hour.
What is miles per hour (mph)?
Miles per hour is a unit of Speed or Velocity in both US Customary Units as well as the Imperial System. It measures the number of miles traveled in an hour. The symbol for miles per hour is mph. There are 0.6213711922 mph in km/h.
What is kilometers per hour (km/h)?
Kilometers per hour is a unit of Speed or Velocity in the Metric System. It measures the number of kilometers traveled in an hour. The symbol for kilometers per hour is km/h and the International spelling for this unit is kilometres per hour. There are 1.609344 km/h in mph.
Conversion Formula
Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.
The formula to convert from mph to km/h is:
km/h = mph x 1.609344
Conversion Example
Next, let's look at an example showing the work and calculations that are involved in converting from miles per hour to kilometers per hour (mph to km/h).
Miles per hour to Kilometers per hour Conversion Example
Task: Convert 75 miles per hour to kilometers per hour (show work) Formula: mph x 1.609344 = km/h Calculations: 75 mph x 1.609344 = 120.7008 km/h Result: 75 mph is equal to 120.7008 km/h
Conversion Table
For quick reference purposes, below is a conversion table that you can use to convert from mph to km/h.
Miles per hour to Kilometers per hour Conversion Chart
| miles per hour (mph) | kilometers per hour (km/h) |
|---|---|
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 3 mph | 4.828032 km/h |
| 4 mph | 6.437376 km/h |
| 5 mph | 8.04672 km/h |
| 6 mph | 9.656064 km/h |
| 7 mph | 11.265408 km/h |
| 8 mph | 12.874752 km/h |
| 9 mph | 14.484096 km/h |
| 10 mph | 16.09344 km/h |
| 20 mph | 32.18688 km/h |
| 30 mph | 48.28032 km/h |
| 40 mph | 64.37376 km/h |
| 50 mph | 80.4672 km/h |
| 75 mph | 120.7008 km/h |
| 100 mph | 160.9344 km/h |
| 250 mph | 402.336 km/h |
| 500 mph | 804.672 km/h |
| 750 mph | 1,207.008 km/h |
| 1,000 mph | 1,609.344 km/h |
| 2,500 mph | 4,023.36 km/h |
| 5,000 mph | 8,046.72 km/h |
| 7,500 mph | 12,070.08 km/h |
| 10,000 mph | 16,093.44 km/h |
| 25,000 mph | 40,233.6 km/h |
| 50,000 mph | 80,467.2 km/h |
| 75,000 mph | 120,700.8 km/h |
| 100,000 mph | 160,934.4 km/h |
| 250,000 mph | 402,336 km/h |
Related Units
The following tables provide a summary of the Speed or Velocity units (Per Hour, Per Minute, Per Second and Per Millisecond) within their respective measurement systems.
Per Hour
| Unit | Symbol | Measurement System |
|---|---|---|
| inches per hour | in/h | US Customary Units/Imperial System |
| feet per hour | ft/h | US Customary Units/Imperial System |
| yards per hour | yd/h | US Customary Units/Imperial System |
| miles per hour | mph | US Customary Units/Imperial System |
| millimeters per hour | mm/h | Metric System |
| centimeters per hour | cm/h | Metric System |
| decimeters per hour | dm/h | Metric System |
| meters per hour | m/h | Metric System |
| kilometers per hour | km/h | Metric System |
| knot | kn | Non-SI (International) |
Per Minute
| Unit | Symbol | Measurement System |
|---|---|---|
| inches per minute | in/m | US Customary Units/Imperial System |
| feet per minute | ft/m | US Customary Units/Imperial System |
| yards per minute | yd/m | US Customary Units/Imperial System |
| miles per minute | mi/m | US Customary Units/Imperial System |
| millimeters per minute | mm/m | Metric System |
| centimeters per minute | cm/m | Metric System |
| decimeters per minute | dm/m | Metric System |
| meters per minute | m/m | Metric System |
| kilometers per minute | km/m | Metric System |
Per Second
| Unit | Symbol | Measurement System |
|---|---|---|
| inches per second | in/s | US Customary Units/Imperial System |
| feet per second | ft/s | US Customary Units/Imperial System |
| yards per second | yd/s | US Customary Units/Imperial System |
| miles per second | mi/s | US Customary Units/Imperial System |
| millimeters per second | mm/s | Metric System |
| centimeters per second | cm/s | Metric System |
| decimeters per second | dm/s | Metric System |
| meters per second | m/s | Metric System |
| kilometers per second | km/s | Metric System |
Per Millisecond
| Unit | Symbol | Measurement System |
|---|---|---|
| millimeters per millisecond | mm/ms | Metric System |
| centimeters per millisecond | cm/ms | Metric System |
| decimeters per millisecond | dm/ms | Metric System |
| meters per millisecond | m/ms | Metric System |
| kilometers per millisecond | km/ms | Metric System |
Note: For Speed or Velocity conversions, US Customary Units and the Imperial System are equivalent.
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