Miles per Hour to Kilometres per Hour

About Miles per Hour to Kilometres per Hour

This converter turns miles per hour into kilometres per hour as you type, and works the other way too: type in the kilometres per hour box to convert back. To convert miles per hour to kilometres per hour, multiply by 1.609344. For example, 20 mph is 32.18688 km/h, and 60 mph is 96.56064 km/h.

Speed limits in the UK are in miles per hour, most other countries use kilometres per hour, and sailors and pilots use knots, so travellers and drivers convert speeds often. Both units have exact definitions, so the converter gives an exact result, rounded only for display. Use the table below for common values, or set the decimal places to round the answer for a form or a label.

How to use Miles per Hour to Kilometres per Hour

1. Type the amount in miles per hour in the first box.
2. Read the answer in kilometres per hour in the second box and in the result line below.
3. To convert the other way, type in the kilometres per hour box instead, or use the swap button to open the kilometres per hour to miles per hour page.
4. Choose a number of decimal places if you need a rounded figure, then copy the result line.

Common uses

• Driving abroad or in a hire car with a different speedometer
• Reading a wind speed forecast
• Comparing running, cycling or boat speeds
• Physics and engineering homework