The basics: the 4.0 scale
Every GPA system starts from the same place: converting letter grades into points. An A is worth 4.0, a B is worth 3.0, a C is worth 2.0, and so on, with pluses and minuses adding or subtracting roughly 0.3 (an A- is 3.7, a B+ is 3.3). Multiply each class's points by its credit hours, add them up, and divide by total credit hours — that's your GPA.
That's unweighted GPA: every class counts the same, whether it's a standard class or the hardest AP course at your school.
How weighted GPA works
Weighted GPA adjusts for course difficulty by adding bonus points:
- Regular classes: no bonus (A = 4.0)
- Honors classes: typically +0.5 (A = 4.5)
- AP or IB classes: typically +1.0 (A = 5.0)
The exact bonus amounts vary by school district, so a weighted GPA of 4.3 at one school might not mean exactly the same thing as a 4.3 at another. Some schools even cap weighted GPA at 5.0, while others allow it to go higher with enough AP classes.
Which one do colleges actually look at?
Most colleges recalculate your GPA using their own formula when reviewing applications — they don't simply take the number printed on your transcript. Admissions officers care more about what classes you took and how you did in them than which specific weighting system your school uses.
That said, weighted GPA does matter in one specific way: it shows you challenged yourself with harder coursework, which colleges value. A 3.6 unweighted GPA built entirely from AP classes generally looks stronger than a 3.9 unweighted GPA built entirely from standard classes.
Curious how an AP class would change your GPA?
Try the Weighted GPA Calculator →A side-by-side example
Take a student with these five classes, each worth 1.0 credit:
| Class | Grade | Unweighted points | Weighted points |
|---|---|---|---|
| English (Regular) | A | 4.0 | 4.0 |
| Chemistry (Honors) | A- | 3.7 | 4.2 |
| US History (AP) | B+ | 3.3 | 4.3 |
| Spanish (Regular) | A | 4.0 | 4.0 |
| Calculus (AP) | B | 3.0 | 4.0 |
Unweighted GPA: (4.0+3.7+3.3+4.0+3.0)/5 = 3.60. Weighted GPA: (4.0+4.2+4.3+4.0+4.0)/5 = 4.10. Same grades, very different numbers — which is exactly why it matters to know which scale you're looking at.
Cumulative vs. semester GPA
One more distinction worth knowing: your semester GPA reflects only the current term's classes, while your cumulative GPA is the credit-weighted average across every semester you've completed. A single rough semester won't tank your cumulative GPA nearly as much as it might feel like in the moment, especially once you have several strong semesters behind you.
Common questions
- Can weighted GPA go above 4.0? Yes — that's the whole point of the bonus system. A perfect AP-only schedule could weight up to 5.0.
- Does every school weight the same way? No. Always check your school's specific bonus amounts (+0.5/+1.0 is common, but not universal) and any GPA caps.
- Should I take a harder class even if it might lower my unweighted GPA? Generally yes, in moderation — colleges consistently say they'd rather see a B in an AP class than an A in a regular one, as long as your overall course load stays manageable.