ScientificConverters.com Precise unit conversions for science & engineering.

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    Convert Kilometers to Miles

    1 kilometer (km) equals 0.6213711922 miles (mi).

    km
    Swap: convert miles to kilometers
    mi

    1 km = 0.6213711922 mi

    Type in either box. Scientific notation works: 1.5e-3.

    Converting a list? Use the bulk kilometer to mile converter to paste a column from Excel.

    How to Convert Kilometer to Mile

    • 1 km = 0.6213711922 mi
    • 1 mi = 1.609344 km
    • Example: convert 15 km to mi: 15 km = 15 × 0.6213711922 mi = 9.320567884 mi

    Reference conditions. mi: The international yard and pound agreement (1959) fixed 1 yard = 0.9144 m exactly, so the inch, foot and mile are exact.

    Formula

    mi = km × 0.6213711922373

    or mi = km ÷ 1.609344

    Derivation from SI units:

    • 1 km = 10³ m
    • 1 mi = 5280 ft = 5280 × 0.3048 m = 1609.344 m
    • 1 km = 1000 m ÷ 1609.344 m per mi = 0.6213711922373 mi

    Both units are defined exactly, so the factor is exact. Kilometer definition: kilometer; Mile definition: mile.

    Worked examples

    1. A 5 km run is 3.106855961 mi.
      5 km × 0.6213711922 = 3.106855961 mi
    2. A speed of 100 km per hour is 62.13711922 mi per hour.
      100 km × 0.6213711922 = 62.13711922 mi

    Kilometer to Mile conversion table

    Kilometer to Mile conversion table
    Kilometers (km)Miles (mi)
    0.1 km0.06213711922 mi
    0.5 km0.3106855961 mi
    1 km0.6213711922 mi
    1.5 km0.9320567884 mi
    2 km1.242742384 mi
    3 km1.864113577 mi
    5 km3.106855961 mi
    8 km4.970969538 mi
    10 km6.213711922 mi
    15 km9.320567884 mi
    20 km12.42742384 mi
    21.0975 km13.10937873 mi
    25 km15.53427981 mi
    42.195 km26.21875746 mi
    50 km31.06855961 mi
    80 km49.70969538 mi
    100 km62.13711922 mi
    160 km99.41939076 mi
    200 km124.2742384 mi
    500 km310.6855961 mi
    1000 km621.3711922 mi

    Where it's used

    Road distances, race lengths and speed limits in kilometres are converted to miles for the US and UK. 1 km is about 0.621 mi.

    Kilometer to other length units

    1 km expressed in every length unit
    Conversion1 km equals
    kilometer to meter 1000 m
    kilometer to centimeter 100000 cm
    kilometer to millimeter 1000000 mm
    kilometer to micrometer 1000000000 µm
    kilometer to nanometer 1000000000000 nm
    kilometer to angstrom 10000000000000 Å
    kilometer to mile 0.6213711922 mi
    kilometer to yard 1093.613298 yd
    kilometer to foot 3280.839895 ft
    kilometer to inch 39370.07874 in
    kilometer to mil 39370078.74 mil
    kilometer to nautical mile 0.5399568035 nmi

    Frequently asked questions

    How many miles is 10 km?

    10 km = 6.214 mi.

    How many miles are in 1 kilometer?

    1 km = 0.6213711922 mi.

    How do I convert kilometers to miles?

    Multiply the value in km by 0.6213711922, or divide it by 1.609344. For example, 15 km × 0.6213711922 = 9.320567884 mi.

    Is the km to mi conversion exact?

    Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).

    Sources

    Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.

    Cite this page

    APA

    Scientific Converters. (2026, October 15). Convert Kilometers to Miles. Retrieved October 17, 2026, from https://scientificconverters.com/length/kilometers-to-miles/

    IEEE

    Scientific Converters, "Convert Kilometers to Miles," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/kilometers-to-miles/