Kilometers to Miles Converter
Convert kilometers to miles instantly with our free online calculator. Whether you're tracking running distances, planning road trips, or converting international measurements, this tool provides accurate conversions.
Conversion Formula
| Conversion | Formula | Example |
|---|---|---|
| km to miles | km × 0.621371 | 10 km = 6.21 miles |
| miles to km | miles × 1.60934 | 10 miles = 16.09 km |
Quick Reference Table
| Kilometers | Miles | Common Use |
|---|---|---|
| 1 km | 0.62 mi | Short walk |
| 5 km | 3.11 mi | 5K race distance |
| 10 km | 6.21 mi | 10K race distance |
| 21.1 km | 13.1 mi | Half marathon |
| 42.2 km | 26.2 mi | Full marathon |
| 100 km | 62.14 mi | Long driving distance |
Why the Difference?
The kilometer is based on the metric system (1/10,000 of the distance from Earth's equator to the North Pole), while the mile has Roman origins (1,000 paces). The metric system is used in most countries, while the US, UK (for roads), and a few others use miles.
Running Pace Conversion
| Pace (min/km) | Pace (min/mile) |
|---|---|
| 4:00 | 6:26 |
| 5:00 | 8:03 |
| 6:00 | 9:39 |
| 7:00 | 11:16 |
Conversion Code Example
``javascript
function kmToMiles(km) {
return km * 0.621371;
}
function milesToKm(miles) {
return miles * 1.60934;
}
// Examples
console.log(kmToMiles(10)); // 6.21371
console.log(milesToKm(10)); // 16.0934
``
Country Usage
| System | Countries |
|---|---|
| Metric (km) | Most of the world |
| Imperial (miles) | USA, Liberia, Myanmar |
| Mixed | UK (miles for roads, km for other) |