How do I convert Kilometer (km) to Mile (mi)?

1 km equals 0.621371 mi using SI-based conversion and precise factors.

What is the formula to convert Kilometer (km) to Mile (mi)?

This is a linear unit conversion using a constant factor between units.

Yes, it uses exact definitions or standardized constants (e.g., 1 in = 25.4 mm).

Use the shareable URL pattern: /convert/km-to-mi/1

Category: Length

Value From To Precision

0.621371 mi

1 km = 0.621371 mi

High-precision rounding: 6 decimals

We convert by pivoting through the SI base unit for Length and applying exact factors where applicable.

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Length measures distance. SI base is the meter; many legacy units survive in trade and navigation.

Kilometer (km)

1,000 meters. Common for road and geographic distances.

History: Adopted with the metric system during the 19th century.

Mile (mi)

1,609.344 meters.

History: Derived from Roman mile; international mile fixed by treaty in 1959.