The GPA Scale Explained: 4.0 vs 5.0
The short answer: the 4.0 scale is the standard, unweighted way to score grades — A = 4.0 down to F = 0. The 5.0 scale is the same thing with rigor bonuses stacked on top, so an A in an AP class can be worth 5.0. Every GPA is just an average of these point values, which is why knowing your school's exact scale matters more than the headline number.
The standard 4.0 scale
Most US high schools use this conversion, with plus and minus grades stepping by roughly a third of a point:
| Letter | Points | Typical percentage |
|---|---|---|
| A+ / A | 4.0 | 93–100% |
| A- | 3.7 | 90–92% |
| B+ | 3.3 | 87–89% |
| B | 3.0 | 83–86% |
| B- | 2.7 | 80–82% |
| C+ | 2.3 | 77–79% |
| C | 2.0 | 73–76% |
| C- | 1.7 | 70–72% |
| D+ | 1.3 | 67–69% |
| D | 1.0 | 63–66% |
| D- | 0.7 | 60–62% |
| F | 0.0 | Below 60% |
Two common variations to check in your student handbook: some schools award 4.3 for an A+, and some use a flat scale where any A is 4.0 and any B is 3.0, with no plus/minus steps. Percentage cutoffs vary by district too — the table above is the most common pattern, not a law. College Board's guide to the 4.0 scale carries the same caveat: schools differ on plus/minus and grade cutoffs, so always check yours.
The 5.0 weighted scale
The 5.0 scale isn't a different conversion — it's the 4.0 scale plus bonus points for course difficulty:
| Course type | Bonus | A is worth | B is worth | C is worth |
|---|---|---|---|---|
| Regular | — | 4.0 | 3.0 | 2.0 |
| Honors | +0.5 | 4.5 | 3.5 | 2.5 |
| AP / IB | +1.0 | 5.0 | 4.0 | 3.0 |
The ceiling is 5.0 only if you take exclusively AP/IB classes. A realistic strong schedule mixing regular and advanced courses tops out in the 4.3–4.7 range. Full comparison of the two systems: weighted vs unweighted GPA.
Why the same grades produce different GPAs
Three students with identical report cards can carry three different GPAs:
- Different plus/minus policies. An A- is 3.7 at one school and 4.0 at a flat-scale school. Over a full transcript that's easily a tenth of a point.
- Different weighting. One district gives Honors +1.0, another +0.5, another nothing.
- Different scales entirely. A handful of districts use 6.0, 11-point, or 100-point systems.
This is why college systems recalculate: the UC formula strips plus/minus and caps bonuses, and UF's recalculation ignores plus/minus and drops electives. Your "real" GPA depends on who's asking.
Converting between scales
There's no perfect formula, but these rules of thumb hold:
- Weighted → unweighted: you can't convert mathematically; recalculate from the grades. Our calculator shows both at once.
- Percentage → 4.0: use the table above per class, then average — the same points-times-credits method university registrars publish. Don't convert your overall percentage average directly — it distorts at the boundaries.
- No credits available? A simple average works when classes carry equal weight — the no-credits calculator handles it.
FAQ
Is a 4.0 on a 5.0 scale good?
Yes — a 4.0 weighted means either straight As in regular classes or strong grades in a rigorous schedule (a B average in all-AP classes is also 4.0 weighted). Context decides; see what is a good high school GPA.
What scale do colleges want on applications?
Report your GPA on the scale your school uses and identify the scale. Application platforms ask for both the number and the scale precisely because they vary.
My school uses percentages only. What's my GPA?
Convert each class's percentage to a letter with the table above, then average the point values — the by-hand guide walks through it.