1 mile per hour = 1.609344 km/h
1 mph = 1.60934 km/h · type math like (12*4)+6.5
Miles per hour to km/h lets people outside the US and UK interpret American road limits, car reviews, hurricane strengths and sports speeds such as baseball pitches and tennis serves.
Tennis serves and baseball pitches are tracked in mph in US broadcasts, while European tournaments show km/h. A 130 mph serve is 209.2 km/h. The fastest recorded tennis serves are around 163 mph, which is 262 km/h.
Car reviews and specifications from the US use mph for top speed and 0–60 times. A car with a 155 mph electronically limited top speed is capped at 249.4 km/h, which is why German cars are often limited at 250 km/h.
Hurricanes are classified on the Saffir–Simpson scale in mph. Category 1 starts at 74 mph (119 km/h) and Category 5 starts at 157 mph (252.7 km/h). Weather services elsewhere often convert these figures for local audiences.
UK road signs use mph too. A 20 mph zone in a British city is 32.2 km/h, while the national motorway limit of 70 mph is 112.7 km/h.
Electric scooters and bikes are speed-limited by law in many countries. US e-bikes in Class 3 are limited to 28 mph, which is 45 km/h, while EU pedelecs are limited to 25 km/h, only 15.5 mph.
Running treadmills in the US display speed in mph, while gyms in Europe show km/h. A 6 mph pace is 9.66 km/h, which is a 10 minute mile or about 6:13 per kilometer. A 10 mph sprint setting is 16.1 km/h. Runners switching between countries often need to convert their usual settings.
Air speed records and aircraft are also described in mph in American media. The Concorde cruised at about 1,350 mph, which is 2,173 km/h, more than twice the speed of sound. The SR-71 Blackbird set a record of 2,193 mph, or 3,529 km/h, in 1976.
Wind speeds on US weather apps use mph. A tornado rated EF3 has estimated winds of 136–165 mph, which is 219–266 km/h. Meteorological agencies outside the US use km/h or m/s for the same storms.
To check an answer, the km/h figure should be about 60% bigger than the mph figure. 45 mph should come out near 72 km/h (72.42 exactly). If your result is smaller than the mph figure, you divided by mistake. A memorable anchor is that 50 mph is almost exactly 80 km/h.
km/h = mph × 1.609344
Reverse: 1 km/h = 0.62137119 mph.
Convert 70 mph to km/h.
Answer: 70 mph = 112.7 km/h.
| mph | km/h |
|---|---|
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 3 mph | 4.828032 km/h |
| 4 mph | 6.437376 km/h |
| 5 mph | 8.04672 km/h |
| 6 mph | 9.656064 km/h |
| 7 mph | 11.265408 km/h |
| 8 mph | 12.874752 km/h |
| 9 mph | 14.484096 km/h |
| 10 mph | 16.09344 km/h |
| 11 mph | 17.702784 km/h |
| 12 mph | 19.312128 km/h |
| 13 mph | 20.921472 km/h |
| 14 mph | 22.530816 km/h |
| 15 mph | 24.14016 km/h |
| mph | km/h |
|---|---|
| 16 mph | 25.749504 km/h |
| 17 mph | 27.358848 km/h |
| 18 mph | 28.968192 km/h |
| 19 mph | 30.577536 km/h |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.28032 km/h |
| 40 mph | 64.37376 km/h |
| 50 mph | 80.4672 km/h |
| 75 mph | 120.7008 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 |
A 70 mph limit is 112.7 km/h.
A 100 mph fastball is 160.9 km/h.
Category 3 starts at 111 mph sustained wind, which is 178.6 km/h.
Aviation and marine forecasts use knots. 50 kn is 92.6 km/h, not 80.5.
That understates by 7%. 70 mph would become 105 km/h instead of 112.7.
UK roads still use mph, though Ireland switched to km/h in 2005.
1 mph = 1.609344 km/h exactly.
Origin. British road legislation from the 1800s set limits in mph.
Used today. US and UK roads, US weather wind speeds and sport.
1 km/h is 1,000 m per hour, about 0.6214 mph.
Origin. Metric speed unit adopted alongside the kilometer.
Used today. Road speed in most countries.
96.6 km/h.
48.3 km/h.
Thrust SSC reached 763 mph in 1997, which is 1,228 km/h.
On 20 January 2005.
1 mph is 1.609 times faster than 1 km/h.