All tools / Unit Converter3 mph to kmh3 mph = 4.828032 kmhFormula1 mph = 1.609344 kmh, so 3 × 1.609344 = 4.828032Need another value? Use the full Unit ConverterOther mph → kmh conversions1 mph → kmh2 mph → kmh5 mph → kmh10 mph → kmh15 mph → kmh20 mph → kmhReverse conversion3 kmh → mphRelated conversions1 kmh → mph1 mps → kmh1 knots → kmh