Miles per Hour to Kilometers per Hour Converter
Instant mph to km/h conversion. Enter a number and get the answer right away.
How to Convert mph to km/h
1 mph equals 1.609344 km/h. To convert mph to km/h, multiply by 1.609344 (km/h = mph × 1.609344). For example, 10 mph is 16.0934 km/h. The calculator above applies the same conversion in both directions, so you can also type a value in km/h to get mph.
km/h = mph × 1.609344
One mph equals 1.609344 km/h. Use the formula below for any number.
mph to km/h Conversion Table
| mph | km/h |
|---|---|
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 3 mph | 4.828032 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 15 mph | 24.14016 km/h |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 75 mph | 120.7008 km/h |
| 100 mph | 160.9344 km/h |
| 150 mph | 241.4016 km/h |
| 200 mph | 321.8688 km/h |
| 500 mph | 804.672 km/h |
| 1000 mph | 1609.344 km/h |
Common mph to km/h Conversions
When You Need This Conversion
Useful for driving, cycling, running pace, marine and aviation forecasts.
Units and Conventions
1 mph = 1.609344 km/h exactly. A knot is one nautical mile per hour, or 1.852 km/h. Wind and marine reports usually use knots, while road signs use mph or km/h.
Related Converters
Frequently Asked Questions
How many km/h are in 1 mph?
1 mph equals 1.609344 km/h. The formula is km/h = mph × 1.609344.
What is the mph to km/h formula?
Use km/h = mph × 1.609344. The calculator above applies it instantly and also works in reverse.
Can I convert km/h back to mph?
Yes. Type a value into the second field and the calculator converts in the opposite direction.
Is this converter free and accurate?
Yes. It runs in your browser with no signup. Results come from the exact conversion factor shown on this page and are rounded to 6 decimal places.
Which standard does this page use?
See the Units and Conventions section above - it lists the exact definition used here and the alternatives common in other countries.
Does it work on my phone?
Yes. The calculator is designed for phones first, with large inputs and instant results as you type.