Driving a rental car overseas, or watching a US movie or game with speeds in mph, mile-per-hour figures can feel unfamiliar if you're used to km/h.
The exact formula
One mph is 1.60934 km/h. Multiply mph by 1.60934 to get km/h.
A quick mental-math shortcut
"km/h ≈ mph × 1.6" is close enough for most purposes. Going the other way, "mph ≈ km/h ÷ 1.6" or "km/h × 0.6".
Driving in mph countries
US and UK road signs are posted in mph. If your rental car's speedometer reads km/h, remember the sign (mph) and the dash (km/h) are different units — always convert the posted limit rather than treating the number as km/h, or you'll be speeding badly.
When the speedometer shows both
Many newer cars show mph on the outer ring and km/h on an inner ring or digital display — checking for this ahead of time avoids confusion on the road.
Conversion table
| mph | km/h |
|---|---|
| 30 | 48.3 |
| 60 | 96.6 |
| 70 | 112.7 |
| 100 | 160.9 |
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