km/h to mph: Convert kilometers per hour to miles per hour

Answer
0.621371 mph = 1 km/h

1 km/h = 0.621371 mph. To convert kilometers per hour to miles per hour, multiply by 0.6213711922. To go back, multiply by 1.609344 (or divide by 0.6213711922). Kilometers per hour are the road-speed unit in most of the world.

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Mach assumes the speed of sound at sea level, 15 °C (340.29 m/s).
Converted speed
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How we calculated this

    Printed from sizebench.com/mph-to-kmh-speed-converter

    For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer

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    Formula

    mph = km/h × 0.6213711922 km/h = mph × 1.609344 100 km/h × 0.6213711922 = 62.1371 mph

    km/h to mph table

    km/hmph
    5 km/h3.10686 mph
    10 km/h6.21371 mph
    20 km/h12.4274 mph
    30 km/h18.6411 mph
    40 km/h24.8548 mph
    50 km/h31.0686 mph
    60 km/h37.2823 mph
    70 km/h43.496 mph
    80 km/h49.7097 mph
    90 km/h55.9234 mph
    100 km/h62.1371 mph
    110 km/h68.3508 mph
    120 km/h74.5645 mph
    130 km/h80.7783 mph
    140 km/h86.992 mph
    150 km/h93.2057 mph
    160 km/h99.4194 mph
    180 km/h111.847 mph
    200 km/h124.274 mph
    250 km/h155.343 mph
    300 km/h186.411 mph

    Factors from NIST SP 811 and the BIPM SI Brochure; values rounded to 6 significant digits. Reverse: MPH to km/h.

    Frequently asked questions

    How many mph is 100 km/h?

    100 km/h = 62.1371 mph.

    How many km/h is 1 mph?

    1 mph = 1.60934 km/h.

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