This chart is for comparing your best performance in a race and an "equivalent" performance at a different distance. You enter your time and distance and this chart will give you a percent off of the world record. That percentage is then added on to all the distances and it gives you a time. These times do not mean than you could run that time for that distance.
For example, if you are a sprinter and can run 20.00 for 200, you probably can't also run a 13:04.01 5000. The 100 and 400 times the chart gives you (10.11 and 44.70) are probably more accurate.
The theory behind this calculation is that every world record is equivelantly difficult. That is, Michael Johnson's 19.32 world record for 200m is just as good as Hicham El Guerrouj 's 3:26.00 1500m world record. Non-Olympic distances (1000m, 2000m, Mile, 10k (road), and Half Marathon) probably have relatively slower world records because they are not run as often.