Miles per Hour to Kilometers per Hour Converter

How to convert Miles per Hour to Kilometers per Hour

To convert Miles per Hour to Kilometers per Hour, multiply the value in Miles per Hour by 1.60934. For example, 5 mph = 8.0467 km/h.

If you need to convert from Miles per Hour to Kilometers per Hour, the key figure to remember is that one Miles per Hour equals 1.60934 Kilometers per Hour. This page gives you a live calculator, a full reference table, and the underlying formula so you can convert mph to km/h with complete confidence.

Speed conversions are used in driving, sports, aviation, weather, and physics. The most common need is converting between kilometers per hour and miles per hour when traveling between countries.

Understanding Miles per Hour and Kilometers per Hour

Most of the world posts speed limits in kilometers per hour, while the US and UK use miles per hour. Meters per second is the scientific standard, and knots (nautical miles per hour) are used in aviation and maritime navigation. A car at 100 km/h is traveling about 62 mph — a conversion worth knowing for any international driver.

How accurate is this conversion?

Speed conversions are exact because they derive directly from exact length and time definitions. Since 1 mile = 1.609344 kilometers exactly, all speed conversions between these units are precise.

All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.

Quick reference: common Miles per Hour to Kilometers per Hour values

The most frequently searched conversions are 1 Miles per Hour = 1.60934 Kilometers per Hour, 5 Miles per Hour = 8.0467 Kilometers per Hour, 10 Miles per Hour = 16.0934 Kilometers per Hour, and 100 Miles per Hour = 160.934 Kilometers per Hour. The full table further down covers every common value, and the calculator handles any number you need in between.