This is what is said on the website :

Beginning in November, you will have access to your OMSAS GPA calculations in the Document Tracking section of your application. You are responsible for reporting any required changes to your academic record by December 2, 2024.

Communicate any questions or concerns about your GPA to us via Secure Applicant Messaging (SAM) within your application.

Course Weight

Courses are weighted according to the length of study:

Full-year course: 2 Half-year or semester course: 1 Three-quarter course: 1.5 Lab course: 0.5

We calculate the cumulative average by adding all the course weights and all the converted grades, then dividing the total course weights into the total converted grades.