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Convert mph to kph

This calculator converts mph to kph (miles per hour to kilometers per hour) and vice versa - kph to mph.

One mph (mile per hour) is defined as 1.609344 kph (kilometers per hour). This unit of measurement is mostly used in USA to indicate vehicle or aircraft speed and traffic speed limits. Canadian traffic speed limits are posted in km per hour. A typical speed limit on Canadian 400-series highways in year 2025 is 100 km/h that is 62.14 mph with a 110 kph (68.35 mph) limit on select stretches. US interstate highways are limited at 65, 70 and sometimes 75 mph (104, 112 and 120 kph) depending on particular state. This calculator provides conversion of mph to kph and vice versa.

Conversion Chart
Speed, mph	10	20	30	40	50	60	70	80
Speed, kph	16.093	32.187	48.280	64.374	80.467	96.561	112.654	128.748

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