An unweighted GPA puts every class on the same 4.0 scale, so an A is worth 4.0 whether it came from a regular class or an Advanced Placement (AP) one. A weighted GPA gives harder classes extra points, usually on a 5.0 scale, so an A in an honors, AP or International Baccalaureate (IB) class can count as 4.5 or 5.0. The difference is whether course difficulty changes the value of a grade.
Both describe the same report card. They just answer different questions: unweighted asks how high your grades are, weighted asks how high your grades are relative to how hard the classes were.
How unweighted GPA works
Unweighted GPA is the simple version. Each letter grade maps to a fixed number, and difficulty is ignored:
- A = 4.0
- B = 3.0
- C = 2.0
- D = 1.0
- F = 0.0
You average those values across your courses, weighting each by its credit hours, and the result lands between 0.0 and 4.0. An A in gym counts the same as an A in AP Calculus. This is the scale most colleges fall back on when they want to compare students from different schools, because every school can produce it the same way.
How weighted GPA works
Weighted GPA is common in US high schools. It bumps up the value of grades earned in harder classes so the transcript reflects a tougher course load. A typical setup adds half a point for honors and a full point for AP or IB:
- A in a regular class = 4.0
- A in an honors class = 4.5
- A in an AP or IB class = 5.0
Because of that extra point, a weighted GPA can climb above 4.0. A student loaded with AP classes and straight As might finish around 4.5. The exact rules vary by school. Some use a 5.0 cap, some add different amounts, and some weight only certain subjects, so a weighted number means little without knowing the school’s policy.
Why colleges often recalculate
Because weighting rules differ from school to school, a 4.3 at one school is not the same as a 4.3 at another. To compare applicants fairly, many colleges recalculate every GPA to their own internal scale. Some strip the weighting back out to an unweighted 4.0 figure, then read the transcript to judge course rigour separately. Others apply their own weighting system, counting only academic core subjects.
The practical takeaway: the weighted number on your report card is not always the number an admissions office uses. They care about the grades and the difficulty of the classes, and they want both on a scale they control.
Credit-weighted is not the same as difficulty-weighted
There is a naming trap worth clearing up. “Weighted” gets used for two different ideas:
- Difficulty-weighted GPA is the high-school idea above, where AP and honors classes are worth extra points.
- Credit-weighted GPA is how nearly every GPA is averaged, including in college. Each course counts in proportion to its credit hours, so a 4-credit class moves your average more than a 1-credit class. This has nothing to do with difficulty.
A standard college GPA is credit-weighted but not difficulty-weighted. Every course sits on the 4.0 scale, and a 3-credit A and a 3-credit A count equally regardless of how hard each class was. When people say a college GPA is “unweighted,” they mean no difficulty bonus, not that credit hours are ignored.
A worked example
Here is one semester, scored both ways. The student takes four classes worth 3 credits each.
| Course | Grade | Unweighted | Weighted |
|---|---|---|---|
| English (regular) | A | 4.0 | 4.0 |
| US History (honors) | A | 4.0 | 4.5 |
| AP Biology | B | 3.0 | 4.0 |
| AP Calculus | A | 4.0 | 5.0 |
Unweighted, the four grade points are 4.0, 4.0, 3.0 and 4.0. With equal credits, the average is 3.75.
Weighted, the values become 4.0, 4.5, 4.0 and 5.0, for an average of 4.375.
Same transcript, two numbers: 3.75 unweighted and about 4.38 weighted. The gap comes entirely from the honors and AP bonuses. Notice the B in AP Biology still scores 4.0 on the weighted scale, the same as an A in a regular class, which is exactly what weighting is meant to capture.
Which number to use
Use whichever the situation asks for. If a scholarship form or your school transcript reports weighted GPA, give that. If a college recalculates to an unweighted scale, the unweighted figure is closer to what they will use.
The GPA calculator uses the standard 4.0 credit-weighted college scale: every course on the 4.0 scale, weighted by credit hours, with no difficulty bonus. That gives you the unweighted result colleges often recalculate to. To run the numbers from scratch, see how to calculate GPA. If you are chasing a target and want to know what a single grade needs to be, see what grade do I need on the final.