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Speed Converter

Convert speeds for driving, running, sailing, flying and science.

1 kilometer per hour = 0.6213711922 miles per hour

Formula: mph = km/h ÷ 1.609344

The same amount in other units

UnitValue
Meter per second (m/s)0.2777777778
Kilometer per hour (km/h)1
Mile per hour (mph)0.6213711922
Knot (kn)0.5399568035
Foot per second (ft/s)0.9113444153

Popular conversions

Speed units around the world

Road speeds are given in kilometers per hour in most countries, and in miles per hour in the United States and the United Kingdom. Because a mile is exactly 1.609344 kilometers, 100 km/h is about 62 mph and 60 mph is about 97 km/h.

Ships and aircraft use knots, one nautical mile per hour, which is exactly 1.852 km/h. Wind speed is given in knots, km/h or meters per second depending on the country. Science uses meters per second, the SI unit of speed.

Units in this converter

Meter per second (m/s)
The SI unit of speed. Used in science and, in some countries, for wind speed.
Kilometer per hour (km/h)
Used for road speed limits and car speedometers in most countries.
Mile per hour (mph)
Exactly 1.609344 km/h. Used for road speeds in the United States and the United Kingdom.
Knot (kn)
One nautical mile per hour, exactly 1.852 km/h. Used at sea, in aviation and for wind speed.
Foot per second (ft/s)
Exactly 0.3048 meters per second. Used in engineering and sports science in the United States.

Frequently asked questions

How do I convert km/h to mph?

Divide the speed in km/h by 1.609344, or multiply it by about 0.621371. For example, 100 km/h is about 62.14 mph.

What is a knot?

A knot is a speed of one nautical mile per hour, exactly 1.852 km/h or about 1.151 mph. It's used at sea, in aviation and for wind speed.

How do I convert m/s to km/h?

Multiply by 3.6. A speed of 10 meters per second is 36 km/h.

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