If you are new to the Ontario education system, the credit system can feel overwhelming at first. This guide breaks down how Ontario Secondary School Diploma (OSSD) credits work, what students need to graduate, and how families can approach course planning with confidence.
What Is a Credit?
In Ontario, a credit is earned when a student successfully completes a course that has been developed from a Ministry of Education curriculum policy document. Each credit-bearing course typically represents 110 hours of learning.
Credits are categorized by subject area — English, Mathematics, Science, Social Sciences, Arts, and more — and by course type, which indicates the level and pathway the course is designed for.
Course Types Explained
Ontario secondary courses are offered at different levels to match student goals and learning needs. The main course types you will encounter are:
Open courses are designed for all students regardless of their postsecondary destination. They are common in Grades 9 and 10.
Academic courses develop students' knowledge and skills through the study of theory and abstract problems. They are typically taken by students planning to attend university.
University preparation courses (U-level) are designed for students planning to attend university and are most common in Grades 11 and 12.
University/College preparation courses (M-level) are designed for students who plan to attend university or college.
Understanding which course type is appropriate for a student's goals is an important part of planning a successful academic pathway.
How Many Credits Are Needed to Graduate?
To earn an Ontario Secondary School Diploma, students are generally required to complete a total of 30 credits. Of these, 18 are compulsory credits in specific subject areas, and 12 are optional credits that students can choose based on their interests and goals.
In addition to credits, students are also required to complete 40 hours of community involvement activities and pass the Ontario Secondary School Literacy Requirement.
It is important to note that specific graduation requirements can change, and families should always verify current requirements directly with their school or the Ontario Ministry of Education.
Compulsory vs. Optional Credits
Compulsory credits ensure that all students develop a broad foundation of knowledge. They typically include credits in English, Mathematics, Science, Canadian History, Canadian Geography, Arts, Health and Physical Education, French as a Second Language, and Civics and Career Studies.
Optional credits give students the flexibility to explore areas of personal interest, deepen their knowledge in a subject, or take courses that align with their postsecondary plans.
Planning Ahead: Why Course Selection Matters
The courses a student takes in Grades 9 and 10 often set the foundation for what is available to them in Grades 11 and 12. Many senior-level courses have prerequisites, meaning a student must have completed a specific earlier course before enrolling.
For students with university aspirations, it is especially important to take the appropriate course types early. Switching from an Applied pathway to a University pathway later in secondary school can require additional planning.
Families are encouraged to review course options carefully and speak with an academic advisor to ensure students are on a pathway that supports their goals.
Understanding the Ontario credit system is the first step toward confident academic planning. Whether your child is just entering secondary school or is already mid-way through, taking the time to understand how credits, course types, and graduation requirements work together can make a meaningful difference in their educational journey.