MPH to KM/H Calculator
Convert miles per hour to kilometres per hour instantly. Enter any speed in mph to get the exact km/h equivalent, plus metres per second, knots and feet per second.
MPH to KM/H Converter
Enter any speed in miles per hour and see the metric equivalent instantly.
Miles per hour
Enter a whole number or decimal. Your conversion updates automatically as you type.
Multiply mph by 1.609344 to convert miles per hour to kilometres per hour.
Your converted speed will appear here
Enter a speed in mph to see km/h plus metres per second, knots and feet per second.
How to Convert MPH to KM/H
Miles per hour and kilometres per hour both measure speed, so converting between them only requires changing the distance unit. One international mile is exactly 1.609344 kilometres, which means the same conversion factor can be applied directly to mph.
= 96.56064 km/h
Common MPH to KM/H Conversions
These are useful reference points for everyday driving, travel, sport and vehicle speeds. The calculator above keeps the full conversion factor internally, while the table is rounded for easier reading.
| Miles per hour | Kilometres per hour | Useful reference |
|---|---|---|
| 5 mph | 8.05 km/h | Fast walking or easy running pace |
| 10 mph | 16.09 km/h | Running or cycling reference |
| 20 mph | 32.19 km/h | Common low urban road speed |
| 30 mph | 48.28 km/h | Approximately 48 km/h |
| 40 mph | 64.37 km/h | Approximately 64 km/h |
| 50 mph | 80.47 km/h | Approximately 80 km/h |
| 60 mph | 96.56 km/h | Approximately 97 km/h |
| 70 mph | 112.65 km/h | Approximately 113 km/h |
| 80 mph | 128.75 km/h | Approximately 129 km/h |
| 100 mph | 160.93 km/h | Approximately 161 km/h |
Understanding MPH When Driving in a KM/H Country
Speed units become particularly useful when travelling between countries. A driver who normally thinks in mph may see road signs, navigation apps or a vehicle display using km/h instead.
A few conversion anchors make this easier to judge quickly: 30 mph is about 48 km/h, 50 mph is about 80 km/h, 60 mph is about 97 km/h and 70 mph is about 113 km/h.
These are conversion references rather than recommended driving speeds. Always follow the posted limit for the road you are using and adjust your speed for the conditions.
How to Estimate MPH to KM/H Without a Calculator
When you only need an approximate answer, there are a couple of useful mental shortcuts. They are not as precise as multiplying by 1.609344, but they work well for quick comparisons.
For legal, engineering, scientific or other situations where precision matters, use the exact conversion factor rather than a mental estimate.
MPH vs KM/H
The two units describe exactly the same type of measurement — distance travelled during one hour. The difference is simply whether that distance is measured in miles or kilometres.
When Is an MPH to KM/H Conversion Useful?
Driving is one of the most obvious uses, particularly when travelling internationally or using an imported vehicle, but the conversion appears in plenty of other situations too.
Running and cycling equipment may use a different speed unit from your fitness app, motorsport broadcasts can use either system depending on the audience, weather reports may describe wind speeds in different units, and technical or educational work often requires speeds to be expressed in metric units.
Because the time unit remains one hour in both mph and km/h, converting between them is simpler than converting to units such as metres per second.
MPH to KM/H FAQs
Quick answers to common questions about converting miles per hour and kilometres per hour.
Related Speed Calculators
Convert the other way or switch between metric, imperial and scientific speed units.