Kilometers per Hour to Miles per Hour Converter (km/h to mph)
1 km/h ≈ 0.621371 mph. Convert km/h to mph for European, Canadian and Asian speed limits, car top speeds and trains, with km/h and mph charts.
Mile per Hour (mph) = Kilometer per Hour (km/h) × 0.621371192237
Kilometer per Hour (km/h): The kilometre per hour is the speed unit on road signs and speedometers in most of the world. Because 1 km is 1000 m and 1 hour is 3600 s, 1 km/h is exactly 5/18 m/s (about 0.2778 m/s).
Mile per Hour (mph): Miles per hour is the road-speed unit used in the United States and the United Kingdom. The international mile is exactly 1609.344 m, so 1 mph is exactly 0.44704 m/s or 1.609344 km/h.
| Kilometer per Hour (km/h) | Mile per Hour (mph) |
|---|---|
| 1 | 0.621371192237 |
| 5 | 3.10685596119 |
| 10 | 6.21371192237 |
| 25 | 15.5342798059 |
| 50 | 31.0685596119 |
| 100 | 62.1371192237 |
Speed limit signs in continental Europe, Canada, Japan, Korea and most other countries are in kilometers per hour, and so are car specifications and train timetables written for those markets. Visitors used to mph convert by multiplying by about 0.621371, because one mile is exactly 1.609344 km.
Cars sold in metric countries show km/h as the main speedometer scale, so the practical habit abroad is to convert the posted limit rather than the needle. A 130 km/h motorway limit, common in France and the advised speed on German Autobahns, is about 81 mph, and the 50 km/h town limit used across most of Europe is about 31 mph, just above a 30 mph zone in the UK.
How to use this tool
- Type a value in the Kilometer per Hour box to see it in miles per hour, or type in the Mile per Hour box to convert the other way.
- Press ⇄ to swap the two units, or Load example for a typical value.
- Check the charts below for common values; for other units, open the Speed converter.
Formula
Mile per Hour (mph) = Kilometer per Hour (km/h) × 0.621371192237
Kilometer per Hour (km/h) = Mile per Hour (mph) × 1.609344
Both factors come from exact definitions: 1 mile per hour = 1.609344 kilometers per hour and 1 kilometer per hour = 0.621371192237 miles per hour (shown to 12 significant digits).
Example
Two conversions worked with the same factors the converter uses:
130 km/h × 0.621371192237 ≈ 80.7783 mph
65 mph × 1.609344 = 104.60736 km/h
Kilometer per Hour to Mile per Hour chart
Common values from kilometers per hour to miles per hour, rounded to four decimal places.
| Kilometer per Hour (km/h) | Mile per Hour (mph) |
|---|---|
| 10 | 6.2137 |
| 20 | 12.4274 |
| 30 | 18.6411 |
| 40 | 24.8548 |
| 50 | 31.0686 |
| 60 | 37.2823 |
| 70 | 43.496 |
| 80 | 49.7097 |
| 90 | 55.9234 |
| 100 | 62.1371 |
| 110 | 68.3508 |
| 120 | 74.5645 |
| 130 | 80.7783 |
| 140 | 86.992 |
| 150 | 93.2057 |
| 180 | 111.8468 |
| 200 | 124.2742 |
| 250 | 155.3428 |
| 300 | 186.4114 |
| 320 | 198.8388 |
Mile per Hour to Kilometer per Hour chart
The reverse direction for values people often look up.
| Mile per Hour (mph) | Kilometer per Hour (km/h) |
|---|---|
| 15 | 24.1402 |
| 25 | 40.2336 |
| 30 | 48.2803 |
| 40 | 64.3738 |
| 45 | 72.4205 |
| 50 | 80.4672 |
| 55 | 88.5139 |
| 60 | 96.5606 |
| 65 | 104.6074 |
| 70 | 112.6541 |
| 75 | 120.7008 |
| 80 | 128.7475 |
Speeds set in kilometers per hour
| Limit or speed | Kilometer per Hour (km/h) | Mile per Hour (mph) |
|---|---|---|
| Residential streets in Korea (Safe Speed 5030) | 30 | 18.6411 |
| Town limit in most of continental Europe | 50 | 31.0686 |
| German roads outside towns, general limit | 100 | 62.1371 |
| French motorways in the rain | 110 | 68.3508 |
| Advisory speed on German Autobahns | 130 | 80.7783 |
| Top speed of many German performance cars, limited | 250 | 155.3428 |
| Tohoku Shinkansen, top operating speed | 320 | 198.8388 |
Quick mental estimate
Divide by 8 and multiply by 5: 120 km/h → 15 × 5 = 75 mph, against an exact 74.56 mph. Taking 5/8 runs about 0.6% high, so the estimate errs a fraction of a mile per hour on the fast side.
Use the converter or the charts when the exact figure matters.
The two units
Kilometer per Hour (km/h): The kilometre per hour is the speed unit on road signs and speedometers in most of the world. Because 1 km is 1000 m and 1 hour is 3600 s, 1 km/h is exactly 5/18 m/s (about 0.2778 m/s).
Mile per Hour (mph): Miles per hour is the road-speed unit used in the United States and the United Kingdom. The international mile is exactly 1609.344 m, so 1 mph is exactly 0.44704 m/s or 1.609344 km/h.
Frequently asked questions
How fast is 100 km/h in mph?
About 62.1 mph. A 100 km/h limit, common on Canadian highways, therefore sits between the 60 and 65 mph limits found on many US highways.
When did Ireland switch to km/h?
On 20 January 2005, when every speed limit sign in the Republic of Ireland changed to kilometers per hour. Northern Ireland, as part of the UK, still uses mph, so the units change at the border.
Is 130 km/h a speed limit on German Autobahns?
On sections without a posted limit it is only the advisory speed (Richtgeschwindigkeit), not a maximum. Many stretches do have fixed limits, often 100 or 120 km/h, and those are enforced like any other limit.
How precise is the result?
The converter uses the exact definitions above with browser floating-point arithmetic and shows up to 12 significant digits. The charts round to four decimal places for reading.
Sources
Last updated:
Page address with these inputs: https://kakao.mobile/tools/kilometers-per-hour-to-miles-per-hour-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Kilometers per Hour to Miles per Hour Converter (km/h to mph). https://kakao.mobile/tools/kilometers-per-hour-to-miles-per-hour-converter/
“Kilometers per Hour to Miles per Hour Converter (km/h to mph).” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/kilometers-per-hour-to-miles-per-hour-converter/.
Paste this code into your page. The widget runs in your visitors' browsers, shows no ads and keeps a link back to this page. Embedding terms