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Miles Per Hour to Kilometers Per Hour Converter

Instant, two-way conversion across common engineering units.

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1 mph = 1.609344 km/h(Miles per hour → Kilometres per hour)

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Converting miles per hour to kilometers per hour

To convert miles per hour to kilometers per hour, multiply the value by 1.609344. Speed conversions appear in wind loading, air velocity in ducts and transport analysis, where codes mix metric and imperial units.

Miles Per Hour (mph)

Miles per hour (mph) is the road and wind speed unit in the US and UK.

Origin
Derived from the statute mile of 1,609.344 m.
Where it is used
Used for design wind speeds in US codes and for traffic and transport data.
Relation to SI
1 mph = 0.44704 m/s exactly.

Kilometers Per Hour (km/h)

Kilometers per hour (km/h) is the everyday metric speed unit.

Origin
A practical multiple of the SI meter per second.
Where it is used
Used for vehicle speed, transport planning and weather reporting.
Relation to SI
1 km/h = 0.2778 m/s, so 3.6 km/h equals 1 m/s.

Frequently asked questions

How many kilometers per hour are in one mile per hour?

1 mph equals 1.609344 km/h.

How do I convert miles per hour to kilometers per hour?

Multiply the value by 1.609344. For example, 10 mph equals 16.09344 km/h.

How do I convert back from kilometers per hour to miles per hour?

1 km/h equals 0.62137119 mph. The converter above works in both directions, so you can type into either field.

Which speed unit do wind load codes use?

Eurocode and most metric standards state basic wind speed in meters per second, while US standards such as ASCE 7 use miles per hour. Check the averaging period as well as the unit.

What is a knot?

One knot is one nautical mile per hour, about 0.514 m/s. It is standard in marine works, aviation and meteorological data.

Is this speed converter free to use?

Yes. Every unit conversion runs in your browser, needs no account and is free for professional use.

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