1 kilometer per hour = 0.62137119 mph
1 km/h = 0.621371 mph · type math like (12*4)+6.5
Kilometers per hour to miles per hour is the conversion drivers need when renting a car abroad, reading foreign speed limits or comparing car performance figures. Most of the world sets limits in km/h, while the US and UK use mph.
Wind speed is another place this pair appears. Many weather services report wind in km/h, while US forecasts use mph. A gust of 90 km/h is 55.9 mph, strong enough to damage trees, and the 118 km/h hurricane-force threshold is 73.3 mph.
Speed cameras in Europe often allow a small tolerance, but the limit itself is set in km/h. If you are used to mph, the numbers look high: 50 km/h is only 31 mph and 80 km/h is 49.7 mph. Many rental car speedometers have both scales, but the inner mph ring is often small.
Cycling and running are also measured in km/h in much of the world. A road cyclist averaging 30 km/h is riding at 18.6 mph, and a marathoner running a 3-hour race averages 14.07 km/h, or 8.74 mph.
Trains are a good example. France's TGV runs at up to 320 km/h in service, which is 198.8 mph, while Japan's Shinkansen reaches 320 km/h on some lines too. The US Acela is limited to 150 mph, or 241.4 km/h, on its fastest stretches.
Aircraft taxi speeds are often around 30 km/h, which is 18.6 mph, while a typical airliner rotates for takeoff at about 270 km/h, or 168 mph.
Many cyclists using European bike computers see km/h. A 25 km/h e-bike limit is 15.5 mph, slower than the 20 mph limit for Class 1 and 2 e-bikes in the US.
Wind speed for a sailboat or kite may be quoted in km/h. A 40 km/h wind is 24.9 mph.
A quick check: the mph number should be a bit over 60% of the km/h number. 110 km/h should land near 68 mph (68.35 exactly). If your result is larger than the km/h figure, you multiplied by 1.609 instead of 0.621. Road signs in countries using km/h almost always end in 0 or 5, so converting a few common limits in advance saves mental arithmetic while driving.
mph = km/h × 0.6213711922
Reverse: 1 mph = 1.609344 km/h.
Convert a 120 km/h motorway limit to mph.
Answer: 120 km/h = 74.6 mph.
| km/h | mph |
|---|---|
| 1 km/h | 0.62137119 mph |
| 2 km/h | 1.2427424 mph |
| 3 km/h | 1.8641136 mph |
| 4 km/h | 2.4854848 mph |
| 5 km/h | 3.106856 mph |
| 6 km/h | 3.7282272 mph |
| 7 km/h | 4.3495983 mph |
| 8 km/h | 4.9709695 mph |
| 9 km/h | 5.5923407 mph |
| 10 km/h | 6.2137119 mph |
| 11 km/h | 6.8350831 mph |
| 12 km/h | 7.4564543 mph |
| 13 km/h | 8.0778255 mph |
| 14 km/h | 8.6991967 mph |
| 15 km/h | 9.3205679 mph |
| km/h | mph |
|---|---|
| 16 km/h | 9.9419391 mph |
| 17 km/h | 10.56331 mph |
| 18 km/h | 11.184681 mph |
| 19 km/h | 11.806053 mph |
| 20 km/h | 12.427424 mph |
| 25 km/h | 15.53428 mph |
| 30 km/h | 18.641136 mph |
| 40 km/h | 24.854848 mph |
| 50 km/h | 31.06856 mph |
| 75 km/h | 46.602839 mph |
| 100 km/h | 62.137119 mph |
| 250 km/h | 155.3428 mph |
| 500 km/h | 310.6856 mph |
| 1 000 km/h | 621.37119 mph |
A 130 km/h limit in France is 80.8 mph.
50 km/h is 31.1 mph; 30 km/h zones are 18.6 mph.
A 0–100 km/h time is measured to 62.1 mph, slightly further than 0–60 mph.
100 km/h is 62.1 mph. 0–100 km/h times are about 3% slower than 0–60 mph times.
Rental cars in Ireland show km/h large and mph small. 100 on the large ring means 62 mph.
1.6 converts mph to km/h. For km/h to mph multiply by 0.621.
One km/h is the speed of covering 1 kilometer in 1 hour, exactly 1/3.6 m/s.
Origin. Adopted with metric road signs across Europe in the 20th century.
Used today. Speed limits, speedometers and weather wind speed in most countries.
One mph is 1 statute mile per hour, exactly 1.609344 km/h.
Origin. Used on British roads since the 1861 Locomotive Act set early limits in mph.
Used today. Roads in the US, UK and a few other countries; baseball pitch speeds; US wind speeds.
Halve the km/h figure and add 10% of the original: 80 → 40 + 8 = 48 mph (exact 49.7).
124.3 mph.
km/h, since 1977.
55.9 mph.