Miles to KM Calculator
Convert miles to kilometres instantly. Perfect for running distances, road trips and international travel — accurate to the exact conversion factor every time.
How to Convert Miles to Kilometres
Converting miles to kilometres is a simple multiplication once you know the conversion factor. Need to go the other way? Use our KM to Miles Calculator instead. One mile equals exactly 1.609344 kilometres — an internationally agreed figure, not an approximation, so this conversion is always precise.
Example: 26.2 miles (marathon) × 1.60934 = 42.16 km
This calculator handles the maths instantly — enter any distance in miles above to see the exact equivalent in kilometres.
Miles to Kilometres — Running & Race Distances
Runners frequently need to convert between miles and kilometres, since race distances are marketed differently around the world. If you're also tracking pace, our MPH to KM/H Calculator converts running and driving speeds between the same two systems. UK and US races are often described in miles, while most international race distances (5K, 10K) use kilometres.
| Race Distance (Miles) | Kilometres |
|---|---|
| 1 mile | 1.61 km |
| 3.1 miles (5K) | 5.00 km |
| 6.2 miles (10K) | 10.00 km |
| 13.1 miles (half marathon) | 21.10 km |
| 26.2 miles (marathon) | 42.20 km |
| 31 miles (50K ultra) | 50.00 km |
General Miles to Kilometres Conversion Table
| Miles | Kilometres |
|---|---|
| 5 miles | 8.05 km |
| 10 miles | 16.09 km |
| 25 miles | 40.23 km |
| 50 miles | 80.47 km |
| 100 miles | 160.93 km |
| 500 miles | 804.67 km |
| 1000 miles | 1,609.34 km |
Why Does the US and UK Still Use Miles?
The mile has origins in the Roman "mille passus" meaning a thousand paces, and was standardised in its modern form in England in 1593. While most of the world adopted the metric system in the following centuries, the United States never officially switched, and the UK retains miles specifically for road distances and speed limits despite using metric units elsewhere.
This calculator is built for anyone converting between the two systems — whether you're planning a US road trip, comparing international running routes, or just curious how far something really is in kilometres. If you're also converting weights for travel, check out our Pounds to KG Calculator.
Common Uses for Converting Miles to Kilometres
- International travel. Understanding driving distances when renting a car or reading maps in a country that uses kilometres.
- Running and cycling. Converting race distances, training plans and personal bests between the two systems.
- Fuel efficiency comparisons. Converting distance before comparing MPG (miles per gallon) with litres per 100km fuel consumption figures — our Fuel Cost Calculator can help estimate the cost of any journey.
- Understanding international content. News, weather reports and geography content often uses kilometres even for readers used to miles.
FAQs
How many kilometres in a mile?
One mile equals 1.60934 kilometres. Multiply your distance in miles by 1.60934 to get kilometres.
How do I convert miles to km for running?
Enter your distance in miles into the calculator above. Common race conversions include: 3.1 miles = 5K, 6.2 miles = 10K, 13.1 miles = half marathon (21.1 km), 26.2 miles = marathon (42.2 km).
Is the miles to km conversion exact?
Yes — one mile is internationally defined as exactly 1.609344 kilometres, so this conversion is always precise, not an approximation.
Why do some countries still use miles?
The US, UK and a few other countries continue to use miles for road distances due to historical tradition, while most of the world uses the metric kilometre.
How do I convert 5 miles to km?
Multiply 5 by 1.60934, which equals 8.05 km. Use the calculator above for instant results with any distance.
What is 26.2 miles in km?
26.2 miles (a marathon) equals 42.16 km. This is one of the most commonly searched running distance conversions.
Is this calculator free?
Yes — completely free, no sign-up required. Enter any distance in miles for an instant result in kilometres.