While the standard unweighted 4.0 grading scale remains the universal baseline across North American universities and colleges, secondary schools frequently deploy weighted scales. These expanded scales grant higher quality points to account for advanced academic rigor. Public school districts regularly recalibrate these matrices; for instance, the Celina Independent School District in Texas updated its high school GPA tiered system for incoming classes to prevent academic hyper-inflation and maintain balance across competitive honors tracks.
| Letter Grade | Percentage Range | Standard (4.0) Scale | Honors (4.5) Scale | AP / IB (5.0) Scale |
|---|---|---|---|---|
| A+ / A | 93, 100% | 4.00 | 4.50 | 5.00 |
| A- | 90, 92% | 3.70 | 4.20 | 4.70 |
| B+ | 87, 89% | 3.30 | 3.80 | 4.30 |
| B | 83, 86% | 3.00 | 3.50 | 4.00 |
| B- | 80, 82% | 2.70 | 3.20 | 3.70 |
| C+ | 77, 79% | 2.30 | 2.80 | 3.30 |
| C | 73, 76% | 2.00 | 2.50 | 3.00 |
| D | 65, 69% | 1.00 | 1.00 | 1.00 |
| F | Below 65% | 0.00 | 0.00 | 0.00 |
Notice that for grades of D or F, most academic institutions eliminate the honors and AP bump. If a student fails an Advanced Placement class, it counts as zero quality points, just like an introductory course. Rigorous coursework buffers a solid B or C, but it does not protect an outright failing grade from dragging down a cumulative GPA.
