All tools / Unit Converter4 miles to km4 miles = 6.437376 kmFormula1 miles = 1.609344 km, so 4 × 1.609344 = 6.437376Need another value? Use the full Unit ConverterOther miles → km conversions1 miles → km2 miles → km3 miles → km5 miles → km6 miles → km7 miles → kmReverse conversion4 km → milesRelated conversions1 km → miles1 cm → inches1 inches → cm1 cm → feet1 feet → cm1 meters → feet