Kilometers to Miles Converter

Convert kilometers to miles instantly. Enter any kilometer value and get the exact mile equivalent, plus the formula and a full reference table.

Kilometers to Miles Converter

Result appears here
km = mi
Common km → mi values
1 km0.6214 mi
5 km3.1069 mi
10 km6.2137 mi
21.1 km13.11 mi
42.2 km26.22 mi
50 km31.069 mi
100 km62.137 mi
200 km124.27 mi

Formula

Conversion formula:
mi = km ÷ 1.60934 (or × 0.621371)

The conversion factor is derived from SI base values:

  • 1 kilometer = 1000 meters
  • 1 mile = 1609.344 meters
  • Factor: 1000 ÷ 1609.344 = 0.621371

Dividing by 1.60934 and multiplying by 0.621371 give identical results.

Kilometers to Miles Reference Table

Kilometers (km) Miles (mi)
1 km0.6214 mi
5 km3.1069 mi
10 km6.2137 mi
20 km12.427 mi
42.195 km26.219 mi
50 km31.069 mi
100 km62.137 mi
200 km124.27 mi
500 km310.69 mi
1000 km621.37 mi

Practical Examples

1
Half marathon - 21.1 km
21.1 ÷ 1.60934 = 13.11 mi
2
Speed limit sign - 100 km/h
In miles ≈ 62.1 mph
3
City distance - 50 km
50 ÷ 1.60934 = 31.07 mi
4
Marathon - 42.195 km
42.195 ÷ 1.60934 = 26.22 mi

Frequently Asked Questions

1 km equals 0.621371 miles.

10 km equals 6.2137 miles.

Approximately. 5 km = 3.107 miles.

Multiply km/h by 0.621371 to get mph. For example, 100 km/h × 0.621371 = 62.14 mph.

Related Conversions

Miles to Kilometers
↩ Reverse
Meters to Feet
Length
Feet to Meters
Length
Centimeters to Inches
Length

Did You Know?

The kilometer was introduced by the French metric system in 1795. Most countries use km for road distances; the US and UK primarily use miles for road signs.

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Reverse Conversion

Convert miles back to kilometers.

Miles to Kilometers →