The kilometer is a metric unit of length equal to 1,000 meters.
Kilometers to Miles
Convert kilometers (km) to miles (mi) instantly. Free online length converter with formulas, tables and examples.
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Length Converter
Convert metric, imperial, and nautical distance units.
Context values
Some unit families need one extra value for a physically accurate result.
The mile is a imperial unit of distance used in road travel.
mi = km × 0.621371192237
Results update instantly for Kilometers to Miles conversions.
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Formula
mi = km × 0.621371192237
km = mi ÷ 0.621371192237
Conversion table
| 1 km | 0.621371 mi |
| 10 km | 6.213712 mi |
| 100 km | 62.137119 mi |
| 1000 km | 621.371192 mi |
Related conversions
Step-by-step example
- Start with the value you want to convert: 5 km.
- Apply the formula: mi = 5 × 0.621371192237.
- Work out the calculation: 5 × 0.621371192237 = 3.107.
- Result: 5 km is equal to 3.107 mi.
Kilometer vs Mile
| Attribute | Kilometer | Mile |
|---|---|---|
| Symbol | km | mi |
| Category | Length | Length |
| System | Metric / SI | US customary / Imperial |
| Typically used for | The kilometer is a metric unit of length equal to 1,000 meters. | The mile is a imperial unit of distance used in road travel. |
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Frequently asked questions
How do you convert kilometer to mile?
Use the formula mi = km × 0.621371192237. One kilometer equals 0.621371192237 miles.
What is Kilometer?
The kilometer is a metric unit of length equal to 1,000 meters.
What is Mile?
The mile is a imperial unit of distance used in road travel.
Is the kilometer to mile conversion exact?
Yes. Kilometer and Mile are both defined against internationally agreed constants, so the conversion factor used here is exact -- any rounding you see comes only from the number of decimal places displayed, not from the relationship itself.
How do I convert mile back to kilometer?
Use the reverse formula km = mi ÷ 0.621371192237. This site's reverse converter does the same calculation automatically.
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About this conversion
This length converter turns kilometer into mile using the exact defined relationship between the two units, not an approximation. A marathon is 42.195 km, or about 26.2 miles — so 5 km is about 3.11 miles. The kilometer, 1,000 meters, has been the standard unit for road and travel distances in most of the world since the metric system spread in the 19th century. The statute mile of 5,280 feet was set by English law in 1593, standardizing an older, less consistent Roman-derived unit. Because both units are built on internationally standardized constants, the same kilometer-to-mile factor works whether you're doing a quick everyday estimate or a calculation that needs to be precise.