Miles vs Kilometers: Key Differences Explained
Compare miles and kilometers to understand conversions between these common distance units.
Quick Answer
1 mile equals 1.609 kilometers. Miles are used in the US/UK; kilometers are used nearly everywhere else.
| Feature | Miles | Kilometers |
|---|---|---|
| Imperial unit used in the US and UK | Metric unit used by most of the world | |
| 1 mile = 1.609 kilometers | 1 kilometer = 0.621 miles | |
| Used for road distances in US/UK | Used for road distances in most other countries | |
| 5,280 feet per mile | 1,000 meters per kilometer |
The mile is the standard unit of distance for roads and everyday measurement in the United States and United Kingdom. One mile equals exactly 5,280 feet or approximately 1.609 kilometers.
The kilometer is part of the metric system and is used for road distances by the vast majority of the world. Its decimal relationship to meters (1 km = 1,000 m) makes conversions simple and intuitive.
When to Use Miles
- Driving or navigating in the United States or UK
- Running (many US races use miles)
- Communicating distances with Americans
When to Use Kilometers
- International travel and communication
- Scientific and academic work
- Athletics (track events use meters/kilometers)
Worked Example
A marathon is 26.2 miles.
Miles
In miles: 26.2 miles.
Kilometers
In kilometers: 26.2 x 1.609 = 42.2 km.
Multiply miles by 1.609 to get kilometers, or multiply km by 0.621 to get miles.
Try Our Calculators
Related Comparisons
Frequently Asked Questions
Why does the US still use miles?
The US adopted miles from the British system and never fully converted to metric despite attempts in the 1970s.
Is a 5K about 3 miles?
Yes, 5 km equals 3.107 miles.
Which is longer, a mile or a kilometer?
A mile is longer — about 1.6 times the length of a kilometer.