Kilometers vs Miles
Differences, use cases, and when to use each
Kilometers (metric) and miles (imperial) measure distance. 1 mile = 1.609 kilometers. Kilometers are used worldwide; miles are used in the US, UK (road signs), and a few other countries.
Quick Comparison
| Feature | Kilometers | Miles |
|---|---|---|
| System | Metric (SI) | Imperial |
| 1 Unit = | 1,000 meters | 5,280 feet / 1.609 km |
| Usage | Worldwide, science | US, UK (roads), Liberia, Myanmar |
| Subdivisions | Decimal (1.5 km) | Fractions or decimal |
When to Use Each
When to Use Kilometers
Use kilometers for international contexts, science, athletics (track events), and anywhere outside the US/UK road system.
When to Use Miles
Use miles for US road distances, UK speed limits, and when communicating with American audiences about travel distances.
Pros & Cons
Kilometers
International standard
Decimal subdivisions
Scientific standard
Less familiar to Americans
Miles
Familiar in US/UK
Used on road signs
Only ~3 countries use for roads
Verdict
1 km = 0.621 miles. 1 mile = 1.609 km. Use the unit your audience expects. Provide both in international contexts.