How many miles in 1 km? The answer is 0.62137119223733. We assume you are converting between mile and kilometre. You can view more details on each measurement unit: miles or km The SI base unit for length is the metre. 1 metre is equal to 0.00062137119223733 miles, or 0.001 km. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between miles and kilometres.