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Catholic Central High School
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The ISBO Table of Equivalent Grades


Once an IB Diploma candidate's teachers have determined his or her predicted grades, specific percentages will be selected from the appropriate ranges shown below. These percentage grades will then be reported to the Ontario Universities Application Centre for the OSSD credits that are considered equivalent to the applicant's IB subjects.

โ€‹IB Gradeโ€‹OSSD Levelโ€‹Percentage Grade
โ€‹7โ€‹4โ€‹97-100%
โ€‹6โ€‹4โ€‹93-96%
โ€‹5โ€‹4โ€‹84-92%
โ€‹4โ€‹3โ€‹72-83%
โ€‹3โ€‹2โ€‹61-71%
โ€‹2โ€‹1โ€‹50-60%
โ€‹1โ€‹Below Level 1Below 50%โ€‹