A metric marathon is a race that covers a distance of 26.2 kilometers or 16.3 miles, depending on the unit of measurement used. It is a popular race distance for runners who are training for a full marathon, as it provides more race day miles in a race environment to track, monitor, and review progress. The MBNA Chester Metric Marathon is one of the events that offer this race distance. It is also a good stepping stone from a half marathon to a full marathon. Despite its name, a metric marathon is not equivalent to a full marathon, which covers a distance of 42.2 kilometers or 26.2 miles.