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mph to km/h Converter
Convert miles per hour to kilometers per hour by multiplying by 1.609344. Includes a highway speed table, the UK speed limit conversion, and a mental-maths shortcut.
Convert mile per hour to kilometer per hour
Formula
Or equivalently:
Worked example
Convert 65 mph to km/h:
Result: 104.61 km/h
How to use
- Enter the speed in miles per hour
- Click "Calculate" to see the equivalent in kilometers per hour
Common conversions
| mph | km/h | |-----|------| | 30 | 48.28 | | 45 | 72.42 | | 55 | 88.51 | | 65 | 104.61 | | 75 | 120.70 | | 100 | 160.93 |
Common use cases
- Car speedometer conversions
- International travel planning
- Sports speed measurements
- Engineering and automotive applications
FAQ
What is the exact conversion factor? 1 mile = 1.609344 kilometers exactly.
Can I use this for aviation? Yes, but aviation typically uses knots (nautical miles per hour).
How accurate is this conversion? The conversion is exact based on the international mile definition.
Is km/h used worldwide? Yes, most countries use km/h for road speed limits.