Convert Mile (mi) to Kilometer (km)
Category: Length
1 mi = 1.609344 km
Precision: 6 decimals; very small non-zero results use significant digits.
How to convert mile (mi) to kilometer (km)
Length measures distance or size. In SI it derives from the meter, defined via the speed of light, which ensures exact, reproducible conversions. Typical applications include construction, mapping, manufacturing tolerances, and navigation; legacy units like inches and feet remain common in trade and building plans.
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Quick conversion table
Handy values for Mile (mi) to Kilometer (km). Click a value to calculate that result.
| Mile (mi) | Kilometer (km) |
|---|---|
| 1.609344 | |
| 0.804672 | |
| 4.02336 | |
| 16.09344 |
Miles to kilometers formula
Multiply statute miles by 1.609344 to get kilometers.
Formula: kilometers = miles × 1.609344
Example
5 mi × 1.609344 = 8.04672 km
The international mile-to-kilometer factor is exact.
Conversion formula
Use the following formula:
Kilometer (km) ≈ Mile (mi) × 1.609344
Convert length from Mile (mi) to Kilometer (km) using a fixed unit ratio. Round only the final result.
Common mistakes
- Confusing international foot (0.3048 m) with legacy ‘US survey foot’ in old datasets.
- Rounding mid-calculation; keep precision to the end.
Unit facts
- Mile (mi): The international mile is exactly 1,609.344 meters. Derived from the Roman ‘mille passus’ (thousand paces).
- Kilometer (km): One kilometer equals 1,000 meters; common for road distances and maps.
About Mile (mi)
Mile (mi)
International mile equals 1,609.344 meters. Used in US/UK road networks, running (marathon splits), and aviation nautical planning conversions.
History: Evolved from the Roman ‘mille passus’ (thousand paces). The international mile was standardized by treaty in 1959 to remove small historical discrepancies.
About Kilometer (km)
Kilometer (km)
Equals 1,000 meters. Common for road distances, running events (5k/10k), and geographic scales. Convenient decimal multiple that keeps numbers human-readable.
History: Spread with metrication in the 19th–20th centuries. Adopted by most countries for signage and mapping, replacing miles in many contexts.