Convert distance from kilometers (km) to miles (mi) with exact, standards-based factors. The calculation uses the internationally adopted definitions: 1 kilometer = 1,000 meters and 1 mile = 1,609.344 meters. Adjustable rounding is provided for readable results.
Kilometers (km) to Miles (mi) Converter
Enter a value in kilometers and press Convert
Kilometers (km)
Result in Miles (mi)
How to use
- Enter a value in the Kilometers field.
- Choose the number of Decimal Places for rounding (0–10).
- Select Convert to compute miles.
- Select Copy Result to copy the output.
- Select Clear All to reset inputs and results.
- Select the Swap button if you want to switch to the reverse calculation on your site.
Unit definitions
Kilometer (km). System: International System of Units (SI). Exact length: 1 km = 1,000 meters. Widely used worldwide for road distances, maps, and scientific work. Relationship to the other unit in this calculator: 1 km = 0.62137119223733 mi (exact ratio derived from 1 km ÷ 1.609344 km per mile).
Mile (mi). System: imperial and US customary. Exact length: 1 mi = 5,280 feet with the international foot defined as exactly 0.3048 m, giving 1 mi = 1,609.344 m. Common in the United States and the United Kingdom for road distances. Relationship to the other unit in this calculator: 1 mi = 1.609344 km (exact).
Conversion formula
Kilometers to miles: miles = kilometers ÷ 1.609344.
Miles to kilometers: kilometers = miles × 1.609344.
Source: NIST – Revised Unit Conversion Factors.
Conversion table
| Kilometers (km) | Miles (mi) |
|---|---|
| 0.10 | 0.062 |
| 0.25 | 0.155 |
| 0.50 | 0.311 |
| 1 | 0.621 |
| 2 | 1.243 |
| 3 | 1.864 |
| 5 | 3.107 |
| 7.5 | 4.660 |
| 10 | 6.214 |
| 12 | 7.456 |
| 15 | 9.321 |
| 20 | 12.427 |
| 25 | 15.534 |
| 30 | 18.641 |
| 42.195 | 26.219 |
| 50 | 31.069 |
| 62.5 | 38.836 |
| 75 | 46.603 |
| 100 | 62.137 |
| 150 | 93.206 |
Real-world examples
- Marathon distance: 42.195 km = 26.219 mi
- 10 km road race: 10.000 km = 6.214 mi
- 5,000 m track event: 5.000 km = 3.107 mi
- Standard outdoor track lap: 0.400 km = 0.249 mi
- NFL field length (goal line to goal line): 0.09144 km = 0.056818 mi
- Golden Gate Bridge total length: 2.737 km = 1.701 mi
- Channel Tunnel length: 50.45 km = 31.348 mi
- Brooklyn Bridge total length: 1.8336768 km = 1.139394 mi
- Verrazzano-Narrows Bridge main span length: 4.176 km = 2.594846 mi
- Lake Pontchartrain Causeway length: 38.35 km = 23.8296 mi
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