Convert mph to kmh instantly
Type any speed in miles per hour (mph) and get the exact value in kilometres per hour (km/h) straight away. Useful for road trips between countries, comparing car specs, reading foreign speed signs, or checking race results.
One mile per hour equals exactly 1.60934 km/h. So 60 mph works out to 96.56 km/h – a conversion many drivers need when crossing from the US or UK into mainland Europe.
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How to use the mph to kmh converter
- Find the speed input labelled mph at the top of the converter.
- Type the speed you want to convert – for example, 70.
- The result in km/h appears instantly below.
- Need to go the other way? Switch the direction or type into the km/h field to convert back to mph.
Worked example: 65 mph to km/h
Imagine you are driving on a US highway at 65 mph and you want to know that speed in km/h for a European friend.
km/h = mph × 1.60934
km/h = 65 × 1.60934
km/h = 104.61Result: 65 mph = 104.61 km/h
Round to the nearest whole number and you get 105 km/h – just over the 100 km/h limit common on European roads.
How the conversion is calculated
The formula is simple multiplication. One international mile is defined as exactly 1,609.344 metres, so one mile per hour equals exactly 1.60934 km/h.
km/h = mph × 1.60934
mph = km/h ÷ 1.60934Common mph to km/h conversions at a glance
| mph | km/h | Common context |
|---|---|---|
| 1 | 1.609 | Walking pace |
| 2 | 3.219 | Slow cycling |
| 5 | 8.047 | Jogging |
| 10 | 16.093 | City cycling |
| 25 | 40.234 | Suburban road limit |
| 50 | 80.467 | Rural road limit |
| 70 | 112.654 | UK motorway limit |
| 100 | 160.934 | High-speed reference |
The reverse conversion factor is 1 km/h = 0.62137 mph. To convert kilometres per hour back to miles per hour, divide by 1.60934 (or multiply by 0.62137).
Different ways people ask the same question
People phrase this conversion in several ways. They all mean the same calculation:
- "mph to kph" – kph and km/h are the same unit; both stand for kilometres per hour.
- "miles per hour to kilometres per hour" – the fully spelled-out version.
- "convert speed from imperial to metric" – mph is part of the imperial system; km/h is metric.
- "how fast is X mph in km/h" – a specific lookup, common when reading US or UK speed limits abroad.
- "kmh to mph" – the reverse direction, handy for European drivers visiting the UK or US.
All of these point to the same single formula. The converter above handles both directions.
Quick tips and common mistakes
- Don't confuse km/h with m/s. Metres per second (m/s) is a different unit used in science. 1 m/s = 3.6 km/h.
- Rounding matters for speed limits. 70 mph is 112.654 km/h, not 113. When checking whether you are within a posted limit, use the precise value.
- Car speedometers in dual-unit countries (like Canada) show both mph and km/h – check which ring you are reading.
- GPS apps switch units automatically based on your region setting, but rental car speedos may stay in the local unit.
- The 'kph' abbreviation is informal. The official SI symbol is km/h. Both are universally understood.
Use the converter at the top of this page any time you need a quick, accurate speed conversion. No app download, no sign-up required.