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KM to Miles Converter

Convert kilometers (km) to miles (mi) instantly. Perfect for running distances, road trips, and international travel.

Enter Kilometers

Conversions

Miles

6.21 mi

Precise: 6.2137 miles

Nautical Miles

5.3996 nmi

Meters

10,000 m

Feet

32,808 ft

Common Distances

KilometersMilesCommon Use
1 km0.62 mi~0.6 miles
5 km3.11 mi~3.1 miles (5K race)
10 km6.21 mi~6.2 miles (10K race)
21.1 km13.11 mi~13.1 miles (Half Marathon)
42.2 km26.22 mi~26.2 miles (Full Marathon)
100 km62.14 mi~62.1 miles
160.9 km99.98 mi~100 miles

What is a Kilometer to Mile Conversion?

Kilometers and miles are both units of distance, but they come from different measurement systems. Kilometers (km) are part of the metric system used by most countries worldwide, while miles (mi) are part of the imperial system used primarily in the United States, United Kingdom, and a few other countries.

The Conversion Formula

miles = kilometers × 0.621371

One kilometer equals approximately 0.621371 miles. Alternatively, one mile equals approximately 1.60934 kilometers.

Quick Mental Math

For a quick estimate without a calculator, multiply kilometers by 0.6 (or slightly over ⅝). For example, 10 km ≈ 6 miles.

Common Conversions for Runners

  • 5K race: 5 km = 3.11 miles
  • 10K race: 10 km = 6.21 miles
  • Half Marathon: 21.0975 km = 13.11 miles
  • Full Marathon: 42.195 km = 26.22 miles

Why Different Countries Use Different Units

Most countries adopted the metric system in the 19th and 20th centuries for its simplicity (based on powers of 10). The United States, however, continued using the imperial system established during British colonial rule, which is why American road signs show miles while most European countries show kilometers.

Practical Applications

  • International Travel: Converting speedometer readings and road distances
  • Running & Fitness: Understanding race distances and training paces
  • Shipping: International freight distance calculations
  • Aviation: Converting between nautical miles and kilometers