A percentage becomes a grade point in two steps: the percentage becomes a letter, and the letter becomes a grade point. Both steps belong to an institution. The University of Toronto publishes both in one table, so a 91 per cent there is an A+ and 4.0. At an institution that publishes no percentage bands, the same 91 has no published grade point at all.
Where the bands are published
Toronto prints them in full: 90 to 100 per cent is A+ at 4.0, 85 to 89 is A at 4.0, 80 to 84 is A- at 3.7, 77 to 79 is B+ at 3.3, 73 to 76 is B at 3.0, 70 to 72 is B- at 2.7. A 91 per cent is therefore an A+ and 4.0 at Toronto. That is the answer for a Toronto transcript and for nobody else's.
Where they are not
Most American registrars publish a letter and a grade point and stop, because the percentage that produced the letter was set by the instructor in that course. A 90 per cent in one class and a 90 per cent in another need not be the same letter, so no institution-wide band exists to publish. Any table that supplies one is filling a gap the institution deliberately left.
What to do instead
For a single course, the syllabus states the mapping the instructor used, and that is a real source with a date on it. For an application, the receiving institution publishes the conversion it will apply. For a formal equivalency, a recognised credential evaluator issues a statement an institution will accept. In every case the authority is named, which is what a general conversion table cannot offer.
Questions people ask about percentage to gpa
What is a 90 per cent as a GPA?
At the University of Toronto, 90 per cent falls in the A+ band and is 4.0. At an institution that publishes no percentage bands there is no published answer, because the percentage-to-letter step belongs to the individual course.
Is 92 per cent a 4.0?
Only where the institution's published bands put it there. Toronto's A+ band starts at 90, so a 92 is 4.0 on that scale. Elsewhere the letter for a 92 is the instructor's to set.
Why is there no standard percentage to GPA table?
Because the percentage that produces a letter is set course by course rather than institution-wide, and most registrars publish only the letter and the grade point. A standard table would be asserting something nobody published.