MPH to KM/H Converter
Convert miles per hour to kilometres per hour, or back, with the exact factor shown.
What this tool does
To convert mph to km/h, multiply by 1.609344. So 30 mph is 48.3 km/h, 60 mph is 96.6 km/h and 70 mph is 112.7 km/h. To convert km/h to mph, divide by 1.609344 or multiply by 0.621371. Enter a speed above for the exact result.
Converts between miles per hour, kilometres per hour, metres per second, knots using exact factors, and shows the factor used.
Updates as you type, and the swap button reverses the direction.
How to use it
- Enter the value in miles per hour, or press Swap units to start from kilometres per hour.
- Pick another unit from the lists if you need a different one.
- Read the result and the factor beneath it.
- Press Copy to copy the result.
Why use this converter
Converts miles per hour to kilometres per hour (and back) with the exact factor of 1.609344. Speed limits, vehicle specs and sports speeds are given in mph in some countries and km/h in others. A quick rule is close but a converter shows the exact figure, which matters for limits.
Why we built it
We built the mph to km/h converter around the exact factor and added knots and m/s. Convert distances with the miles to km converter and sea speeds with the knots to mph converter.
If your task goes further, try the Wind Chill Calculator.
Who this tool is for
- Drivers in a country that uses the other unit
- Sports fans comparing speeds
- Students
When to use it
- Driving in a country with the other unit.
- Comparing vehicle top speeds or sports speeds.
- Reading speed cameras, signs and rental agreements.
- Converting wind and weather speeds.
How it works
One mile per hour is exactly 1.609344 kilometres per hour, so mph × 1.609344 = km/h. One knot is 1.852 km/h and one m/s is 3.6 km/h.
| Miles per hour | Kilometres per hour |
|---|---|
| 20 mph | 32.1869 km/h |
| 30 mph | 48.2803 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.5606 km/h |
| 70 mph | 112.654 km/h |
| 100 mph | 160.934 km/h |
What you give it, and what you get back
| Item | Details |
|---|---|
| Value | A number in the "from" unit. Decimals and negative numbers are accepted. |
| From and To | Any of 4 units: Miles per hour, Kilometres per hour, Metres per second, Knots. |
| Result | The converted value and the exact conversion factor. |
Issues you may run into
| What you see | Why it happens | What to do |
|---|---|---|
| Result is a little different from a quick estimate | A rough 1.6 was used. | Use the exact result. |
| Pace expected instead of speed | Pace is time per distance. | Use the pace calculator. |
| Legal advice expected | This converts numbers only. | Always follow the posted limit in the units shown. |
Assumptions and limitations
- Results are shown with practical rounding; the calculation itself uses exact factors.
- It converts a number between units - it does not know what the quantity is.
Frequently asked questions
How do I convert mph to km/h?
Multiply the mph by 1.609344.
What is 70 mph in km/h?
70 mph is 112.65 km/h.
What is 100 km/h in mph?
100 km/h is about 62.1 mph.
Is kph the same as km/h?
Yes, kph and km/h both mean kilometres per hour.
How do I convert km/h to mph quickly?
Multiply by 0.62, or divide by 1.6.
Is it free and private?
Yes. It runs in your browser.