Easily convert miles to kilometres (mi → km) and kilometres to miles (km → mi) with this free, simple, accurate online calculator below. Whether you’re working out distances for travel, running, or studying, this converter gives you instant, reliable results.
Miles → Kilometres
Kilometres → Miles
How to Use This Converter
Simply enter a number into the Miles (mi) box to see the distance in Kilometres (km) instantly — or for the reverse conversion, enter a number into the Kilometres (km) box to see distance in Miles (mi) instantly. The conversion updates automatically with no page reload.
Conversion Formula
The formulas used here are simple and accurate:
- Miles → Kilometres: miles × 1.60934
- Kilometres → Miles: kilometres × 0.621371
These equations ensure results precise to four decimal places.
Understanding Miles and Kilometres
The mile and the kilometre are both units for measuring distance, but they’re used in different systems. Miles are part of the Imperial system, used mainly in the United States and the United Kingdom, while kilometres belong to the Metric system, common worldwide.
One mile equals approximately 1.60934 kilometres, and one kilometre equals 0.621371 miles. Having an easy way to convert between the two helps when reading maps, setting GPS directions, or tracking fitness distances.
When to Use Miles
If you drive or run in the UK or USA, road signs and car odometers are usually shown in miles. For example, a trip of 50 miles is about 80.47 kilometres. Runners who train in miles can quickly check their distances in kilometres to compare with international events.
When to Use Kilometres
Kilometres are standard in most countries, including Europe, Australia, and Canada. Fitness apps, speed limits, and road distances are typically shown in kilometres per hour (km/h). Using this converter helps avoid confusion when you travel or compare statistics from different countries.
📚 Frequently Asked Questions
1. What is the formula for miles to kilometres?
Multiply miles by 1.60934 to get kilometres.
2. How many kilometres are in 10 miles?
10 × 1.60934 = 16.0934 km
3. How do I convert kilometres to miles?
Divide by 1.60934 (or multiply by 0.621371).