Kilometer to Mile Converter
Converts kilometer to mile (km to mi) and back. The conversion factor is shown below every result.
How to Convert Kilometer to Mile
What Is a Kilometer?
The kilometer (km) is a metric unit of length equal to 1,000 meters.
What Is a Mile?
The statute mile (mi) is a US customary and imperial unit of length, defined as exactly 1,609.344 meters.
Common Kilometer to Mile Reference Points
Real-world reference values for quick sanity checks.
| Item | Kilometer (km) | Mile (approx.) |
|---|---|---|
| A 5K run | 5 km | 3.11 mi |
| A marathon (approx.) | 42.195 km | 26.22 mi |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Kilometer to Mile Conversion Table
| Kilometer (km) | Mile (mi) |
|---|---|
| 1 km | 0.621371 mi |
| 5 km | 3.106856 mi |
| 10 km | 6.213712 mi |
| 26.2 km | 16.279925 mi |
| 42.195 km | 26.218757 mi |
| 50 km | 31.06856 mi |
| 100 km | 62.137119 mi |
| Source: NIST SP 811, Appendix B (1 mi = 1,609.344 m exactly) | |
Frequently Asked Questions
How do I convert kilometers to miles?
Multiply the kilometer value by 0.6213711922. For example, 10 km × 0.6213711922 = 6.214 mi.
Why isn't the km-to-miles factor a round number?
The kilometer is a clean metric unit (1,000 meters), but the mile traces back to a historical English unit standardized at exactly 1,609.344 meters. The ratio between an even metric unit and that fixed historical definition doesn't land on a round number.
How far is a 5K race in miles?
A 5K (5 kilometers) is about 3.107 miles.
Related Length Converters
A good measuring tool marked in both km and mi removes the guesswork at the point of use.