Convert km/h to mph
To convert km/h to mph, divide the value in km/h by 1.609344 — the same as multiplying by about 0.621371. Drivers use it for foreign speed limits and car speedometers, and runners and cyclists use it for pace and speed data. This kmh to mph converter works both ways: type km/h or mph into either box above and the other box, the worked formula and the chart below update as you type.
Kilometers per hour (km/h), sometimes written kph or kmph, is the distance in kilometers you would cover in one hour at a steady speed. It is used on speedometers and road signs in India, Europe, Australia and most of the world. One kilometer per hour is 0.621371 miles per hour.
Miles per hour (mph) is the number of statute miles covered in one hour. Going the other way, one mile per hour equals 1.60934 kilometers per hour. It is the unit on road signs and speedometers in the US and the UK, and it is common for wind speeds in American forecasts and for pitch and serve speeds in sport.
How to convert kmh to mph with this tool
- Type a number into the Kilometers per hour (km/h) box — it starts at 100 km/h as an example.
- Read the answer in the Miles per hour (mph) box and in the result panel, which also shows the formula with your number.
- To go the other way, type into the mph box, or press the swap button to open the MPH to Km/h converter with your value carried over.
- Choose how many decimal places you want, or tap a quick value such as 30 km/h, 50 km/h, 80 km/h.
- Press Copy result to paste the conversion into a message, spreadsheet or note.
Km/h to MPH converter features
Converts both ways
Type in the km/h box to get mph, or in the mph box to get km/h. The other box follows instantly.
Exact factor
Calculations use 1 mph = 1.609344 km/h, and rounding is applied only to the answer you see — choose Auto or 0–10 decimal places.
Formula with your number
The working is shown under the result, for example 100 km/h ÷ 1.609344 = 62.1371 mph, so you can check it or copy the method.
Quick values and chart
Tap common values like 30 km/h, 50 km/h, 80 km/h, or read the km/h-to-mph table further down this page.
Km/h to MPH formula
The formula is mph = km/h ÷ 1.609344. It is exact because one mile is exactly 1.609344 km, so 1 mph is exactly 1.609344 km/h.
The reverse formula is km/h = mph × 1.609344 — or use the MPH to Km/h converter. Three worked examples:
- A 100 km/h motorway limit: 100 km/h ÷ 1.609344 = 62.1371 mph
- A 50 km/h town limit: 50 km/h ÷ 1.609344 = 31.0686 mph
- A 120 km/h highway: 120 km/h ÷ 1.609344 = 74.5645 mph
Km/h to MPH quick reference
The values people look up most often, worked out with the exact factor:
- 1 km/h = 0.621371 mph
- 1 mph = 1.60934 km/h
- 30 km/h = 18.6411 mph
- 50 km/h = 31.0686 mph
- 80 km/h = 49.7097 mph
- 100 km/h = 62.1371 mph
Quick tip: Multiply by 5 and divide by 8 for a close estimate: 80 km/h → 50 mph, against the exact 49.7097 mph.
Related conversions: Knots to Km/h and the full speed converter.
Km/h to MPH conversion table
Values in mph are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.
| km/h | mph | km/h | mph |
|---|---|---|---|
| 5 | 3.1069 | 110 | 68.3508 |
| 10 | 6.2137 | 120 | 74.5645 |
| 20 | 12.4274 | 130 | 80.7783 |
| 30 | 18.6411 | 140 | 86.992 |
| 40 | 24.8548 | 150 | 93.2057 |
| 50 | 31.0686 | 160 | 99.4194 |
| 60 | 37.2823 | 180 | 111.8468 |
| 70 | 43.496 | 200 | 124.2742 |
| 80 | 49.7097 | 250 | 155.3428 |
| 90 | 55.9234 | 300 | 186.4114 |
| 100 | 62.1371 |
Km/h to MPH FAQ
What is 80 km/h in mph?
80 kilometers per hour is 49.7097 miles per hour: 80 km/h ÷ 1.609344 = 49.7097 mph.
How do I convert kmh to mph?
Divide the value in km/h by 1.609344 — the same as multiplying by about 0.621371. For example, 130 km/h ÷ 1.609344 = 80.7783 mph. To convert back, multiply the value in mph by 1.609344 — or use the MPH to Km/h converter.
What is 1 mph in km/h?
One mile per hour is 1.6093 kilometers per hour, because 1 mph × 1.609344 = 1.6093 km/h.
What does 130 km/h equal in mph?
Is kph the same as km/h?
Yes. “kph” and “kmph” are informal abbreviations of kilometers per hour; the SI symbol is km/h. 90 km/h = 55.9234 mph however you write it.