How many millimeters are in an inch? There are 25.4 millimeters in one inch. How many kilometers are in a mile? There are about 1.61 kilometers in a mile.

Nearly every country in the world uses the metric system as its official system of weights and measurements. Yes, fellow Americans, we are among the exceptions to this rule, but there’s no use crying ...

Learn precisely how many feet are in a mile and more fun facts. Your thoughts on the mile are likely all about perspective. If you're driving, it's likely a quick trip (barring massive traffic). You ...