Your transcript likely carries two GPAs that can differ by more than half a point while describing the exact same grades. One rewards you for taking hard courses, one doesn't, and knowing which number you're looking at, or being asked for, changes what it means. Here's the math behind both and how colleges read them.
Unweighted GPA is a plain average of your grades on the 4.0 scale. Course difficulty plays no role: an A in AP Physics and an A in a regular elective both contribute 4.0, a B contributes 3.0, and the ceiling is 4.0 no matter what you take.
Weighted GPA adds points for harder courses before averaging. Under the most common high school scheme, every AP or IB course gets +1.0 and every honors course gets +0.5. That pushes the practical ceiling to 5.0, which is why you'll see applicants reporting GPAs above 4.0. The bump exists for a simple reason: schools don't want students dodging hard classes to protect their average.
| Course | Grade | Unweighted points | Weighted points |
|---|---|---|---|
| AP Calculus BC | A | 4.0 | 5.0 |
| AP US History | B+ | 3.3 | 4.3 |
| Honors English | A | 4.0 | 4.5 |
| Honors Chemistry | B | 3.0 | 3.5 |
| Spanish 3 | A | 4.0 | 4.0 |
| US Government (0.5 cr) | B | 3.0 | 3.0 |
Same six courses, two answers: 19.8 points over 5.5 credits averages to a 3.60 unweighted, while the weighted version carries 22.8 points and lands at 4.15. Neither number is more "real," they measure different things.
Enter courses, grades, levels and credits; the calculator shows your weighted and unweighted GPA together, using the standard +1.0 / +0.5 scheme.
Weighted GPA Calculator →Both GPAs are credit-weighted averages, which is a detail people skip at their peril. The formula:
GPA = Σ(grade points × credits) ÷ Σcredits, with weighted points substituting (grade points + level bump).
Credits change the answer a lot. A year-long course worth 1.0 credit moves your GPA twice as much as a 0.5-credit semester class, so a B in gym can outweigh an A in a half-credit elective. When a college asks for your GPA "as computed by your school," they mean with your school's credit weights and rounding, not a flat average of letter grades.
Three scheme details vary by district and are worth checking in your student handbook: whether the scale caps at 5.0 (most do), whether a failing grade still earns its bump (many schools zero it out), and whether dual enrollment counts as +1.0 like AP or something less. A few schools skip minus grades entirely or use 0.33 steps instead of 0.3, which shaves points off every A- and B+.
The same number means different things in the two systems, so calibrate separately. Unweighted, the average for college-bound students tends to sit a bit above 3.0; 3.5 or better puts you in strong territory, and 3.8+ reads as nearly straight As. Weighted, add roughly 0.3 to 0.5 to those lines depending on how many AP courses your school offers: 4.0 weighted is roughly straight Bs with real rigor, and 4.3+ signals mostly As in AP and IB coursework.
One trap worth naming: a weighted GPA can flatter a transcript. A student with straight Cs in AP courses holds about a 2.0 unweighted but a 3.0 weighted, and "3.0" looks average on paper. This is exactly why nobody gets to report only one number. Your transcript shows both, plus the course list that generated them.
Whatever your school reports, plus frequently a third number you've never seen. Many admissions offices recalculate GPA with their own formula: some strip all weighting and use raw unweighted grades, some re-weight with their own scale, some count only core academic courses and drop electives entirely. The recalculated number is what lands in the academic rating.
What they're really assessing is rigor in context. Alongside your transcript, every school automatically receives a school profile listing available courses, so a reader knows whether your five APs represent most of what was offered or a fraction. An unweighted 3.7 with every hard course your school has reads stronger than a 4.0 that avoided them. The GPA opens the file; the course list tells the story.
For scholarships and eligibility cutoffs, use whichever GPA the rules name, and don't round up in either system. Auto-admission thresholds at big state systems typically specify the scale precisely for this reason.
Grab your transcript and a spreadsheet. For each course: look up the grade points (A = 4.0, stepping down 0.3 per plus/minus), add the level bump for the weighted version, multiply by credits, and total. Divide by total credits for each version separately. Six courses takes about ten minutes, and doing it once teaches you more about how GPAs move than any explanation: you'll see exactly which class is dragging the average and how much one grade change would shift it.
For cumulative GPA across semesters, the same rule applies at scale: total all quality points ever earned, divide by all credits ever attempted. Retaken courses follow your school's replacement policy, which ranges from full grade replacement to averaging both attempts.
It's solid but tells you little without the course load behind it. A 3.8 weighted with a heavy AP schedule usually implies an unweighted GPA in the 3.3-3.5 range, which reads as mostly Bs in hard classes. A 3.8 with one honors course would imply nearly straight As in easier ones. Admissions readers see both numbers, so neither hides the other.
Yes, and it happens more than you'd think. A student with Cs in all AP courses holds roughly a 2.0 unweighted but a 3.0 weighted. That gap cuts both ways: it shows willingness to take hard classes, and it shows the grades didn't hold. Colleges weigh that trade-off explicitly.
No. The most common scheme is +1.0 for AP and IB and +0.5 for honors on a 4.0 base, but districts differ on caps (5.0 is typical), whether failing grades get weighted, how dual enrollment counts, and whether they use 0.3 or 0.33 steps for plus/minus grades. Some schools don't weight at all, which is one reason colleges get a school profile with every transcript.
Whoever writes the rules decides, and they usually say which. Many state programs and big national scholarships use the weighted GPA because it rewards rigor; plenty of institutional awards at colleges use unweighted or their own recalculation. Read the eligibility line carefully before self-reporting either number.