The 4.0 scale is unweighted and caps every course at 4.0 regardless of difficulty. The 5.0 scale is weighted, adding roughly 1.0 grade point for AP or IB courses and 0.5 for Honors courses, so a student with a rigorous, high-scoring schedule can approach a 5.0 GPA.
Why two scales exist
The 4.0 scale answers a simple question: what letter grades did a student earn? The 5.0 scale answers a different question: how did a student perform relative to course difficulty? Reporting both lets colleges see raw academic performance and the rigor of the schedule side by side.
How the 5.0 scale is built
| Letter grade | Regular (4.0 scale) | Honors (+0.5) | AP / IB (+1.0) |
|---|---|---|---|
| A | 4.0 | 4.5 | 5.0 |
| B | 3.0 | 3.5 | 4.0 |
| C | 2.0 | 2.5 | 3.0 |
| D | 1.0 | 1.5 | 2.0 |
| F | 0.0 | 0.0 | 0.0 |
Not every school uses the same bonus
Some districts cap weighted GPA at 4.5 instead of 5.0, some only weight AP/IB and not Honors, and some use a different bonus value entirely. There is no single national standard, which is why a 4.2 weighted GPA at one school is not directly comparable to a 4.2 at another.
Which GPA should go on a college application?
Most applications ask for both, and many colleges recalculate GPA internally using their own weighting formula so every applicant is compared on the same scale. Report the figures your school's transcript provides — do not attempt to convert between different schools' weighting systems yourself.
Grade Calculator Editorial Team
We create plain-language grading tools and educational guides, check every worked example against the underlying formula, and note where school or instructor policies can change the result.