Miles per hour to kilometres per hour
Multiply miles per hour by 1.6093 to get kilometres per hour.
30 mph = 48.2803 km/h
How to convert miles per hour to kilometres per hour
The kilometre per hour is kilometres travelled per hour, the metric speed unit for vehicles. The mile per hour is miles travelled per hour, exactly 1.609344 km/h.
Worked example — 30 mph: 30 × 1.6093 = 48.2803 km/h.
Miles per hour to kilometres per hour table
| Miles per hour | Kilometres per hour |
|---|---|
| 1 mph | 1.6093 km/h |
| 5 mph | 8.0467 km/h |
| 10 mph | 16.0934 km/h |
| 20 mph | 32.1869 km/h |
| 30 mph | 48.2803 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.5606 km/h |
| 70 mph | 112.6541 km/h |
| 100 mph | 160.9344 km/h |
Reverse and related
About miles per hour and kilometres per hour
Mile per hour (mph)
1 mph = 1.6093 km/hDefinition. Miles travelled per hour, exactly 1.609344 km/h
History and origin
Miles per hour grew out of the English mile and the hour as roads and railways spread in the nineteenth century. It equals exactly 1.609344 kilometres per hour.
Current use
Miles per hour is the speed unit for road traffic in the United States and United Kingdom, and is common for running pace.
Source: NIST Handbook 44, Appendix C (Tables of Equivalents — international nautical mile); speeds derived from the exact mile, foot and hour
Kilometre per hour (km/h)
1 km/h = 0.621371 mphDefinition. Kilometres travelled per hour, the metric speed unit for vehicles
History and origin
The kilometre per hour combines the metric kilometre with the hour, and became the standard speed unit as countries adopted the metric system and built road networks. It equals exactly one thousand metres per hour.
Current use
Kilometres per hour is the speed unit on car speedometers and road signs across most of the world.
Source: NIST Handbook 44, Appendix C (Tables of Equivalents — international nautical mile); speeds derived from the exact mile, foot and hour
Where people use this
Miles per hour: vehicle speed in the US and UK, speed limits, running pace. Kilometres per hour: vehicle speed outside the US, speed limits. A 60 mph limit is about 97 km/h.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST Handbook 44, Appendix C (Tables of Equivalents — international nautical mile); speeds derived from the exact mile, foot and hour.
Questions people ask
How many km/h is 60 mph?
A 60 mph limit is about 97 km/h, and 70 mph is about 113 km/h.
How many km/h is 1 mph?
One mile per hour is about 1.609 km/h. To convert mph to km/h, multiply by 1.609.
How do you convert mph to km/h?
Multiply the mph by 1.609, so 30 mph is about 48 km/h. A quick estimate is to add 60%.
How many km/h is 80 mph?
80 mph is about 129 km/h, and 100 mph is about 161 km/h.