To convert miles to kilometers, multiply the number of miles by 1.609344. This means:

kilometers=miles×1.609344\text{kilometers}=\text{miles}\times 1.609344kilometers=miles×1.609344

For example, 1 mile is exactly 1.609344 kilometers. This conversion factor is internationally agreed upon and commonly used for distance conversions between the imperial system (miles) and the metric system (kilometers).