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 is determined by the class. The 125cc and Sidecars classes use all races to determine the winner. In contrast, the 250cc uses the best three race results. For the 350cc and 500cc championships, only the top four race results are considered for the championship.