Convert mph to km/h
To convert mph to km/h, multiply the value in mph by 1.609344. It helps when renting a car in the US or UK, reading baseball or tennis speeds, and comparing wind speeds. This mph to kmh converter works both ways: type mph or km/h into either box above and the other box, the worked formula and the chart below update as you type.
Miles per hour (mph) is the number of statute miles covered in one 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. One mile per hour is 1.60934 kilometers per hour.
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. Going the other way, one kilometer per hour equals 0.621371 miles per hour. It is used on speedometers and road signs in India, Europe, Australia and most of the world.
How to convert mph to kmh with this tool
- Type a number into the Miles per hour (mph) box — it starts at 60 mph as an example.
- Read the answer in the Kilometers per hour (km/h) box and in the result panel, which also shows the formula with your number.
- To go the other way, type into the km/h box, or press the swap button to open the Km/h to MPH converter with your value carried over.
- Choose how many decimal places you want, or tap a quick value such as 20 mph, 30 mph, 50 mph.
- Press Copy result to paste the conversion into a message, spreadsheet or note.
MPH to Km/h converter features
Converts both ways
Type in the mph box to get km/h, or in the km/h box to get mph. 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 60 mph × 1.609344 = 96.5606 km/h, so you can check it or copy the method.
Quick values and chart
Tap common values like 20 mph, 30 mph, 50 mph, or read the mph-to-km/h table further down this page.
MPH to Km/h formula
The formula is km/h = mph × 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 mph = km/h ÷ 1.609344 — or use the Km/h to MPH converter. Three worked examples:
- A 60 mph speed limit: 60 mph × 1.609344 = 96.5606 km/h
- The 70 mph UK motorway limit: 70 mph × 1.609344 = 112.6541 km/h
- A 100 mph fastball: 100 mph × 1.609344 = 160.9344 km/h
MPH to Km/h quick reference
The values people look up most often, worked out with the exact factor:
- 1 mph = 1.60934 km/h
- 1 km/h = 0.621371 mph
- 20 mph = 32.1869 km/h
- 30 mph = 48.2803 km/h
- 50 mph = 80.4672 km/h
- 60 mph = 96.5606 km/h
Quick tip: Multiply by 8 and divide by 5: 50 mph → 80 km/h, close to the exact 80.4672 km/h.
Related conversions: Knots to Km/h and the full speed converter.
MPH to Km/h conversion table
Values in km/h are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.
| mph | km/h | mph | km/h |
|---|---|---|---|
| 5 | 8.0467 | 60 | 96.5606 |
| 10 | 16.0934 | 65 | 104.6074 |
| 15 | 24.1402 | 70 | 112.6541 |
| 20 | 32.1869 | 75 | 120.7008 |
| 25 | 40.2336 | 80 | 128.7475 |
| 30 | 48.2803 | 85 | 136.7942 |
| 35 | 56.327 | 90 | 144.841 |
| 40 | 64.3738 | 100 | 160.9344 |
| 45 | 72.4205 | 120 | 193.1213 |
| 50 | 80.4672 | 150 | 241.4016 |
| 55 | 88.5139 | 200 | 321.8688 |
MPH to Km/h FAQ
What is 30 mph in km/h?
30 miles per hour is 48.2803 kilometers per hour: 30 mph × 1.609344 = 48.2803 km/h.
How do I convert mph to kmh?
Multiply the value in mph by 1.609344. For example, 55 mph × 1.609344 = 88.5139 km/h. To convert back, divide the value in km/h by 1.609344 — or use the Km/h to MPH converter.
What is 1 km/h in mph?
One kilometer per hour is 0.6214 miles per hour, because 1 km/h ÷ 1.609344 = 0.6214 mph.
What does 55 mph equal in km/h?
How do I convert mph to meters per second?
Multiply by 0.44704, which is exact. For example, 60 mph = 26.8224 m/s, the same as 96.5606 km/h ÷ 3.6.