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mph to km/h

mph to km/h Converter

Convert miles per hour to kilometres per hour and back instantly. One mph is 1.609344 km/h exactly, so every conversion is precise — type any speed and read off the result.

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mph ↔ km/h

1 mph = 1.609344 km/h (exact).

Converted speed
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    1 mph = 1.609344 km/h exactly. Speed conversions use the same factor as miles to kilometres.

    mph and km/h

    The UK signs its roads in miles per hour (mph), while almost all of Europe and the rest of the world uses kilometres per hour (km/h). Because speed is just distance over time, the conversion uses the same factor as miles to kilometres: 1 mph = 1.609344 km/h exactly. To go from mph to km/h you multiply by 1.609344; from km/h to mph you divide by 1.609344 (or multiply by about 0.6214).

    💡 Quick answer

    70 mph = 112.65 km/h — the UK motorway limit. 30 mph = 48.28 km/h, close to the Continental 50 km/h town limit. For a rough check, multiply mph by 1.6.

    UK speed limits in km/h

    Speed (mph)Speed (km/h)Where
    20 mph32.2 km/hSchool / residential zones
    30 mph48.3 km/hBuilt-up areas
    40 mph64.4 km/hSome urban roads
    60 mph96.6 km/hSingle carriageways
    70 mph112.7 km/hMotorways / dual carriageways

    Based on the exact factor 1 mph = 1.609344 km/h. UK national speed limits per the Highway Code.

    When you'll need this

    Driving abroad with a UK speedometer, reading a foreign speed limit, or making sense of a car's top speed quoted in km/h. The same 1.609344 factor converts distance too — see the miles to km converter. For petrol costs on a trip, the fuel cost calculator works in miles and MPG; for everything else use the unit converter.

    MB
    Reviewed by Mustafa Bilgic
    Founder, Calcu · Consumer-finance tools

    "The one most British drivers want abroad is 'what's that limit in mph?'. Because speed uses the exact same 1.609344 factor as distance, 130 km/h on a French autoroute is a tidy 81 mph — useful to know before you set off."

    Frequently asked questions

    How do I convert mph to km/h?

    Multiply the speed in mph by 1.609344. For example, 70 mph × 1.609344 = 112.65 km/h. To go the other way, divide km/h by 1.609344.

    What is 70 mph in km/h?

    70 mph is about 112.65 km/h. That's the UK motorway speed limit, which is why European motorways signed at 120 or 130 km/h feel a little faster.

    What is 30 mph in km/h?

    30 mph is about 48.28 km/h. The 30 mph limit common in UK towns is shown as 50 km/h on the Continent, which is very close.

    How do I convert km/h to mph?

    Divide the speed in km/h by 1.609344, or multiply by about 0.6214. For example, 100 km/h ÷ 1.609344 = 62.14 mph.

    Is there a quick way to estimate mph to km/h?

    Yes — multiply mph by 1.6 for a close mental estimate. For an exact figure, multiply by 1.609344, which this converter does automatically.