mph to km/h converter

How to convert miles per hour to kilometers per hour

A mile per hour is exactly 1.609344 kilometres per hour, because the mile is 1.609344 km and the hour is the same hour. Multiply mph by 1.609344. Sixty miles per hour is 96.561 km/h, the number behind the '60 mph is about 100 km/h' road-sign rule. It is not 100. One hundred miles per hour is 160.934 km/h. Pace (minutes per mile) is the reciprocal of speed and is not what this page emits.

A car, a bike computer, or a wind speed that crossed the Atlantic on a website. 70 mph is 112.654 km/h. 30 mph, a common urban limit, is 48.280 km/h. If you are converting a distance instead of a speed, use the miles page. The factor looks the same and the unit you write down is different.

Exact formula

Formulakm/h = mph × 1.609344

km/h = mph × 1.609344 One mph is 1.609344 km/h. Ten mph is 16.09344 km/h. The worked example below uses that same conversion.

Conversion table

The miles per hour column runs from 1 mph (1.609 km/h) through 120 mph (193.12 km/h).

Worked example: Miles per hour to Kilometers per hour

Sixty miles per hour is 96.561 km/h. The road-sign habit of calling that 100 km/h is about 3.4 km/h high. The factor is the mile, 1.609344, because the hour does not change. Seventy mph is 112.65 km/h. An urban 30 mph limit is 48.28 km/h. A knot is 1.852 km/h and is not this mile. A pace in minutes per mile has to be inverted into mph before this multiplication. Multiplying the pace itself by 1.609344 produces a number that is not a speed.

Pitfalls for miles per hour to kilometers per hour

• 1.6 is a short factor. 60 × 1.6 = 96, and the defined product is 96.561. Limits and specs care.
• Knots are nautical miles per hour, 1.852 km/h, and are not these miles per hour.
• A pace of 6 minutes per mile is 10 mph only after you invert it. Do not multiply a pace by 1.609344.
• The hour does not change. Do not also convert seconds unless the original speed was per second.