All rounds counted towards the championship in the 125cc, 250cc and Sidecar categories, while in the 350cc and 500cc championships, only the best three results counted.
For all categories including 125cc, 250cc, Sidecar, 350cc, and 500cc, every round counted towards the championship. In contrast, in the 350cc and 500cc championships, only the best three results were taken into account.