Mph to km/h
One mile per hour is 1.609344 kilometers per hour. Type a speed in mph to see it in km/h.
How to convert mph to km/h
Formula: km/h = mph × 1.609344
For example, 60 mph is 96.56 km/h. The factor is exact, because the mile is defined as 1,609.344 meters.
A quick way to do it in your head
Multiply by 8 and divide by 5. For round numbers that means: add half, then add a tenth of the original.
- 30 mph: 30 + 15 + 3 = 48 km/h. The true answer is 48.28 km/h.
- 50 mph: 50 + 25 + 5 = 80 km/h. The true answer is 80.47 km/h.
- 70 mph: 70 + 35 + 7 = 112 km/h. The true answer is 112.65 km/h.
The shortcut runs about 0.6% low, which is too little to matter on the road.
Mph to km/h table
| Miles per hour | Kilometers per hour |
|---|---|
| 1 mph | 1.61 km/h |
| 5 mph | 8.05 km/h |
| 10 mph | 16.09 km/h |
| 15 mph | 24.14 km/h |
| 20 mph | 32.19 km/h |
| 25 mph | 40.23 km/h |
| 30 mph | 48.28 km/h |
| 35 mph | 56.33 km/h |
| 40 mph | 64.37 km/h |
| 45 mph | 72.42 km/h |
| 50 mph | 80.47 km/h |
| 55 mph | 88.51 km/h |
| 60 mph | 96.56 km/h |
| 65 mph | 104.61 km/h |
| 70 mph | 112.65 km/h |
| 75 mph | 120.7 km/h |
| 80 mph | 128.75 km/h |
| 90 mph | 144.84 km/h |
| 100 mph | 160.93 km/h |
| 120 mph | 193.12 km/h |
| 150 mph | 241.4 km/h |
| 200 mph | 321.87 km/h |
Speed limits in both units
The United States and the United Kingdom post speed limits in miles per hour. Almost every other country uses kilometers per hour, which matters the moment you drive a hire car across a border or read a foreign road sign.
| Limit | In km/h | Where you see it |
|---|---|---|
| 20 mph | 32.19 km/h | UK residential zones, US school zones |
| 30 mph | 48.28 km/h | UK built-up areas |
| 55 mph | 88.51 km/h | Many US two-lane highways |
| 60 mph | 96.56 km/h | UK single-carriageway roads |
| 65 mph | 104.61 km/h | Many US freeways |
| 70 mph | 112.65 km/h | UK motorways, many US interstates |
| 75 mph | 120.7 km/h | Rural interstates in the western US |
Going the other way, the common metric limits of 50, 80, 100 and 120 km/h are about 31, 50, 62 and 75 mph.
Running, cycling and wind
| Speed | In km/h | What it is |
|---|---|---|
| 3 mph | 4.83 km/h | A steady walk |
| 6 mph | 9.66 km/h | A jog: a 10-minute mile, or 6:13 per kilometer |
| 10 mph | 16.09 km/h | An easy cycling pace, or a 6-minute mile on foot |
| 15 mph | 24.14 km/h | A brisk cycling pace |
| 39 mph | 62.76 km/h | The start of gale force on the Beaufort scale |
| 74 mph | 119.09 km/h | The start of hurricane force |
Treadmills sold in the United States show mph and most others show km/h, so the same run reads 6.0 on one and 9.7 on the other. To convert a distance, use miles to km. For knots and meters per second, see the unit converter.
Questions
How fast is 60 mph in km/h?
96.56 km/h.
How fast is 100 mph in km/h?
160.93 km/h.
How fast is 70 mph in km/h?
112.65 km/h.
How fast is 30 mph in km/h?
48.28 km/h.
How many km/h is 1 mph?
Exactly 1.609344 km/h.
Is it km/h, kph or kmh?
The official symbol is km/h. “kph” and “kmh” are informal ways of writing the same unit, kilometers per hour.
Which countries use miles per hour?
Mainly the United States and the United Kingdom, along with a few smaller countries and territories. The rest of the world posts speeds in kilometers per hour.