Whether you're planning a road trip abroad, reading a foreign weather app, or just curious about the difference — converting miles to kilometers (and back) is one of the most common unit conversions in everyday life. Here's everything you need to know.
The Formula
One mile is exactly 1.60934 kilometers. To convert miles to kilometers, multiply by 1.60934:
km = miles × 1.60934
To go the other way — kilometers to miles — divide by 1.60934 (or multiply by 0.62137):
miles = km ÷ 1.60934
A simple mental shortcut: multiply miles by 1.6 for a close-enough estimate. For example, 10 miles ≈ 16 km.
Quick Reference Table
| Miles | Kilometers |
|---|---|
| 1 mile | 1.609 km |
| 5 miles | 8.047 km |
| 10 miles | 16.093 km |
| 26.2 miles (marathon) | 42.195 km |
| 50 miles | 80.467 km |
| 100 miles | 160.934 km |
| 1 km | 0.621 miles |
| 5 km | 3.107 miles |
| 10 km | 6.214 miles |
| 100 km | 62.137 miles |
Real-World Examples
Speed limits: A 60 mph speed limit equals about 97 km/h. A 100 km/h highway limit equals about 62 mph.
Running distances: A 5K race is 3.1 miles. A 10K is 6.2 miles. A half marathon (21.1 km) is 13.1 miles.
Travel: The distance from New York to Los Angeles is about 2,800 miles, or roughly 4,500 kilometers.
Why Are There Two Systems?
The mile is part of the imperial system, historically used in the UK and still used today in the United States, the UK (for road distances), and a handful of other countries. The kilometer is part of the metric system, used by the vast majority of the world for road signs, maps, and everyday distance measurement.
Neither system is objectively better — the metric system is more convenient for scientific use because it's base-10, while the imperial system is deeply embedded in everyday culture in countries that use it.
Need to convert miles and kilometers quickly? Use our free tool.
Open the Converter