For any interested party (thank goodness I ran for so long since, in my school days metric wasn't a big part of math taught):

5 kilometers = 3.1 miles
10 kilometers = 6.2 miles
50 kilometers = 31 miles
100 kilometers (metric century) = 62 miles (yeah, that makes Cinderella 105K)

for you sprinters out there:

100 meters = 0.0621371 miles or 328.084 ft
1500 meters (in track, the metric mile) = 0.932057 miles