How do you convert mph to km/h?
Multiply by 1.609, the same factor as for distances in miles. Driving a rental car across borders, keep three anchors: 30 mph ≈ 48 km/h in town, 60 mph ≈ 97 km/h on rural roads, 70 mph ≈ 113 km/h on motorways.
mph = km/h ÷ 1.609
Common limits and speeds
| 20 mph (UK school zone) | 32 km/h |
| 25 mph (US residential street) | 40 km/h |
| 30 mph (UK built-up) | 48 km/h |
| 45 mph | 72 km/h |
| 55 mph (US highway) | 89 km/h |
| 60 mph (UK single carriageway) | 97 km/h |
| 65 mph (US highway) | 105 km/h |
| 70 mph (UK motorway) | 113 km/h |
| 75 mph (western US interstate) | 121 km/h |
| 85 mph (Texas SH 130, highest US limit) | 137 km/h |
| 100 mph | 161 km/h |
Show every value
- 1 mph = 1.609 km/h
- 2 mph = 3.219 km/h
- 3 mph = 4.828 km/h
- 4 mph = 6.437 km/h
- 5 mph = 8.047 km/h
- 6 mph = 9.656 km/h
- 7 mph = 11.265 km/h
- 8 mph = 12.875 km/h
- 9 mph = 14.484 km/h
- 10 mph = 16.093 km/h
- 11 mph = 17.703 km/h
- 12 mph = 19.312 km/h
- 13 mph = 20.921 km/h
- 14 mph = 22.531 km/h
- 15 mph = 24.14 km/h
- 16 mph = 25.75 km/h
- 17 mph = 27.359 km/h
- 18 mph = 28.968 km/h
- 19 mph = 30.578 km/h
- 20 mph = 32.187 km/h
- 21 mph = 33.796 km/h
- 22 mph = 35.406 km/h
- 23 mph = 37.015 km/h
- 24 mph = 38.624 km/h
- 25 mph = 40.234 km/h
- 26 mph = 41.843 km/h
- 27 mph = 43.452 km/h
- 28 mph = 45.062 km/h
- 29 mph = 46.671 km/h
- 30 mph = 48.28 km/h
- 31 mph = 49.89 km/h
- 32 mph = 51.499 km/h
- 33 mph = 53.108 km/h
- 34 mph = 54.718 km/h
- 35 mph = 56.327 km/h
- 36 mph = 57.936 km/h
- 37 mph = 59.546 km/h
- 38 mph = 61.155 km/h
- 39 mph = 62.764 km/h
- 40 mph = 64.374 km/h
- 41 mph = 65.983 km/h
- 42 mph = 67.592 km/h
- 43 mph = 69.202 km/h
- 44 mph = 70.811 km/h
- 45 mph = 72.42 km/h
- 46 mph = 74.03 km/h
- 47 mph = 75.639 km/h
- 48 mph = 77.249 km/h
- 49 mph = 78.858 km/h
- 50 mph = 80.467 km/h
- 51 mph = 82.077 km/h
- 52 mph = 83.686 km/h
- 53 mph = 85.295 km/h
- 54 mph = 86.905 km/h
- 55 mph = 88.514 km/h
- 56 mph = 90.123 km/h
- 57 mph = 91.733 km/h
- 58 mph = 93.342 km/h
- 59 mph = 94.951 km/h
- 60 mph = 96.561 km/h
- 61 mph = 98.17 km/h
- 62 mph = 99.779 km/h
- 63 mph = 101.389 km/h
- 64 mph = 102.998 km/h
- 65 mph = 104.607 km/h
- 66 mph = 106.217 km/h
- 67 mph = 107.826 km/h
- 68 mph = 109.435 km/h
- 69 mph = 111.045 km/h
- 70 mph = 112.654 km/h
- 71 mph = 114.263 km/h
- 72 mph = 115.873 km/h
- 73 mph = 117.482 km/h
- 74 mph = 119.091 km/h
- 75 mph = 120.701 km/h
- 76 mph = 122.31 km/h
- 77 mph = 123.919 km/h
- 78 mph = 125.529 km/h
- 79 mph = 127.138 km/h
- 80 mph = 128.748 km/h
- 81 mph = 130.357 km/h
- 82 mph = 131.966 km/h
- 83 mph = 133.576 km/h
- 84 mph = 135.185 km/h
- 85 mph = 136.794 km/h
- 86 mph = 138.404 km/h
- 87 mph = 140.013 km/h
- 88 mph = 141.622 km/h
- 89 mph = 143.232 km/h
- 90 mph = 144.841 km/h
- 91 mph = 146.45 km/h
- 92 mph = 148.06 km/h
- 93 mph = 149.669 km/h
- 94 mph = 151.278 km/h
- 95 mph = 152.888 km/h
- 96 mph = 154.497 km/h
- 97 mph = 156.106 km/h
- 98 mph = 157.716 km/h
- 99 mph = 159.325 km/h
- 100 mph = 160.934 km/h
- 125 mph = 201.168 km/h
- 150 mph = 241.402 km/h
- 175 mph = 281.635 km/h
- 200 mph = 321.869 km/h
- 225 mph = 362.102 km/h
- 250 mph = 402.336 km/h
- 275 mph = 442.57 km/h
- 300 mph = 482.803 km/h
- 325 mph = 523.037 km/h
- 350 mph = 563.27 km/h
- 375 mph = 603.504 km/h
- 400 mph = 643.738 km/h
- 425 mph = 683.971 km/h
- 450 mph = 724.205 km/h
- 475 mph = 764.438 km/h
- 500 mph = 804.672 km/h
- 550 mph = 885.139 km/h
- 600 mph = 965.606 km/h
- 650 mph = 1,046.074 km/h
- 700 mph = 1,126.541 km/h
- 750 mph = 1,207.008 km/h
- 800 mph = 1,287.475 km/h
- 850 mph = 1,367.942 km/h
- 900 mph = 1,448.41 km/h
- 950 mph = 1,528.877 km/h
- 1,000 mph = 1,609.344 km/h
- 1,500 mph = 2,414.016 km/h
- 2,000 mph = 3,218.688 km/h
- 2,500 mph = 4,023.36 km/h
- 3,000 mph = 4,828.032 km/h
- 3,500 mph = 5,632.704 km/h
- 4,000 mph = 6,437.376 km/h
- 4,500 mph = 7,242.048 km/h
- 5,000 mph = 8,046.72 km/h
- 5,500 mph = 8,851.392 km/h
- 6,000 mph = 9,656.064 km/h
- 6,500 mph = 10,460.736 km/h
- 7,000 mph = 11,265.408 km/h
- 7,500 mph = 12,070.08 km/h
- 8,000 mph = 12,874.752 km/h
- 8,500 mph = 13,679.424 km/h
- 9,000 mph = 14,484.096 km/h
- 9,500 mph = 15,288.768 km/h
- 10,000 mph = 16,093.44 km/h
Same factor as for distances: 1 mile = 1.609344 km exactly, so 1 mph = 1.609344 km/h. Methodology & sources.
Frequently asked questions
What is 70 mph in km/h?
70 mph equals 112.7 km/h. It is the maximum limit on British motorways, noticeably lower than the 130 km/h allowed on French autoroutes.
My speedometer shows both units, which one applies?
The one used by the country you are driving in: UK and US signs are posted in mph, most of the rest of the world in km/h. European dials usually carry both scales, with mph in smaller print.
Are knots on boats and planes yet another unit?
Yes: 1 knot = 1 nautical mile per hour = 1.852 km/h. An aircraft at 500 knots flies at 926 km/h, not 805. The nautical mile differs from the statute mile behind road mph.
Is there a single speed limit across the United States?
No, each state sets its own. Texas allows 85 mph on a stretch of State Highway 130, 136.8 km/h, the highest posted limit in the country, while Hawaii caps at 60 mph, 96.6 km/h. Most interstates sit between 65 and 80 mph, so between 105 and 129 km/h.
Why do 55 mph signs still turn up?
Because a federal limit of 55 mph, 88.5 km/h, was imposed nationwide in 1974 to save fuel after the oil crisis. It was relaxed in 1987 and only repealed in 1995. States raised their limits at their own pace afterwards, and some urban stretches stayed at 55.