All rounds counted towards the championship in the 125cc and Sidecars, the best three races counted in the 250cc, while in the 350cc and 500cc championships, only the best four results counted.
The number of races that count towards a championship varies depending on the class. The 125cc and Sidecars championships use all races, while the 250cc uses the best three. For the 350cc and 500cc championships, only the top four results are considered.