KMH to MPH Converter
Convert kilometers per hour to miles per hour instantly. One kilometer per hour equals exactly 0.6213712 miles per hour. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
Kilometers per hour to miles per hour calculator
How to convert kilometers per hour to miles per hour
Worked example: convert 48 kilometers per hour to miles per hour. Using miles per hour ← kilometers per hour × 0.6213711922, we get 48 × 0.6213711922 = 29.825817 mph. To check the result, convert back: 29.825817 mph ÷ 0.6213711922 = 48 km/h.
Kilometers per hour to miles per hour chart
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 1 km/h | 0.6213712 mph |
| 2 km/h | 1.242742 mph |
| 3 km/h | 1.864114 mph |
| 4 km/h | 2.485485 mph |
| 5 km/h | 3.106856 mph |
| 6 km/h | 3.728227 mph |
| 8 km/h | 4.97097 mph |
| 10 km/h | 6.213712 mph |
| 12 km/h | 7.456454 mph |
| 15 km/h | 9.320568 mph |
| 20 km/h | 12.42742 mph |
| 25 km/h | 15.53428 mph |
| 30 km/h | 18.64114 mph |
| 40 km/h | 24.85485 mph |
| 50 km/h | 31.06856 mph |
| 75 km/h | 46.60284 mph |
| 100 km/h | 62.13712 mph |
| 150 km/h | 93.20568 mph |
| 200 km/h | 124.2742 mph |
| 250 km/h | 155.3428 mph |
| 500 km/h | 310.6856 mph |
| 1,000 km/h | 621.3712 mph |
Miles per hour to kilometers per hour (reverse)
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 20 mph | 32.18688 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
| 250 mph | 402.336 km/h |
| 500 mph | 804.672 km/h |
| 1,000 mph | 1,609.344 km/h |
About the kilometer per hour and the mile per hour
Kilometers per hour is the speed unit on road signs in most countries. A speed of 100 km/h is about 62 mph and 27.8 m/s.
Miles per hour is the speed unit on road signs and speedometers in the United States and United Kingdom.
One mile per hour equals 1.609344 kilometers per hour, which makes the mile per hour the faster unit of the two.
Everyday sizes in kilometers per hour and miles per hour
| Everyday example (approximate) | In kilometers per hour | In miles per hour |
|---|---|---|
| A slow walk | 5.04 km/h | 3.1317 mph |
| A jogger | 10.8 km/h | 6.7108 mph |
| A city cyclist | 19.8 km/h | 12.303 mph |
| Usain Bolt's peak sprint speed | 44.64 km/h | 27.738 mph |
| A car on a city road | 50.004 km/h | 31.071 mph |
| A car on a highway | 100.01 km/h | 62.142 mph |
Kilometers per hour to miles per hour FAQ
How many miles per hour are in one kilometer per hour?
One kilometer per hour equals exactly 0.6213711922 miles per hour. In the other direction, one mile per hour equals 1.609344 kilometers per hour.
How do I convert kilometers per hour to miles per hour without a calculator?
convert 48 kilometers per hour to miles per hour. Using miles per hour ← kilometers per hour × 0.6213711922, we get 48 × 0.6213711922 = 29.825817 mph. To check the result, convert back: 29.825817 mph ÷ 0.6213711922 = 48 km/h. For a quick estimate, round the factor to 0.62. Then 48 km/h is about 29.76 mph, compared with the exact 29.8258 mph (an error of 0.22%). That is close enough for planning, but use the calculator above when the number matters.
What is a slow walk in miles per hour?
A slow walk is about 5.04 kilometers per hour, which is 3.1317 miles per hour. Treat that as an approximate everyday figure rather than an official measurement.
Are the kilometers per hour and miles per hour the same in every country?
One kilometer per hour is exactly 5/18 m/s. One mile per hour is exactly 0.44704 m/s.