A 5K run is equal to 3.1 miles. The K in 5K stands for kilometer. Since there are 0.62 miles in one kilometer, five kilometers multiplied by 0.62 equals 3.1 miles.
Five kilometer races are common in the United States. They are often ran to help raise money for a charity or as a fundraising event. The five kilometer run is also an Olympic event, but in the Olympics it is known as the 5,000 meter run. On a standard track, athletes must run 25 laps in order to complete a 5,000 meter race. In general, track events are known as 5,000 meter races and cross country events are known as 5K runs.