Grade & GPA · Guide
How to Calculate Weighted Grades and Weighted GPA
Two different things share the word “weighted”. One is your course grade. The other is your GPA. Here is how to calculate both.
Want the answer for your own numbers? Use the free Grade Calculator — it does every step below for you.
Part 1: Weighted course grades
Most syllabi split your grade into categories — homework, quizzes, labs, exams — each worth a set percentage. To find your grade:
- Work out your average percentage in each category.
- Multiply each average by its weight as a decimal (25% = 0.25).
- Add the results.
Grade = Σ(category average × category weight)
Example
Homework 95% (15%), quizzes 82% (25%), labs 88% (20%), exams 76% (40%).
95 × 0.15 = 14.25. 82 × 0.25 = 20.5. 88 × 0.20 = 17.6. 76 × 0.40 = 30.4.
Course grade = 82.75% (a B−)
Notice how the exams, at 40%, pull the grade down more than the excellent homework pulls it up.
Mid-semester: weights that do not add up to 100%
Halfway through a course, some categories have no grades yet. Divide by the weights you have used so far:
Example
Homework 95% (15%) and quizzes 82% (25%) are in. Labs and exams are not.
(14.25 + 20.5) ÷ (0.15 + 0.25) = 34.75 ÷ 0.40.
Current grade = 86.9%
What do you need on the final?
Once you know your current grade and how much the final is worth, you can work out the score you need:
Needed on final = (target − current × (1 − final weight)) ÷ final weight
Current grade 84%, final worth 30%
For an 85%: (85 − 84 × 0.70) ÷ 0.30 = (85 − 58.8) ÷ 0.30 = 87.3%.
For an 80%: (80 − 58.8) ÷ 0.30 = 70.7%.
For a 90%: 104% — out of reach without extra credit
The final grade calculator runs this for any target.
Dropped scores and extra credit
Some teachers drop your lowest quiz or homework score. That changes the category average, not the weight. Quiz scores of 70, 80, 85, 90 and 85 average 82%. Drop the 70 and the average becomes 85%. With quizzes worth 25%, your course grade rises by 0.75 points.
Extra credit works differently from class to class. It may add to one category or straight to the final total. Check the syllabus, then add it where your teacher says.
Points-based courses
Some courses use total points instead of percentages. Then the weighting is built in: add the points you earned and divide by the points possible. 430 out of 500 points is 86%.
Part 2: Weighted GPA
A weighted GPA gives a bonus for harder classes. The most common system:
| Grade | Regular | Honours (+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 |
Example: one semester
AP Chemistry A (5.0), Honours English B (3.5), Algebra II A (4.0), History B (3.0), Spanish A (4.0).
5.0 + 3.5 + 4.0 + 3.0 + 4.0 = 19.5. Divide by 5 classes.
Weighted GPA = 3.9 (unweighted: 3.6)
If classes have different credits, multiply each grade point by its credits before adding, and divide by total credits.
Weighted GPA with different credits
AP Chemistry A (1 credit), Honours English B (1), Algebra II A (1), Health A (0.5)
Points × credits: 5.0 × 1 + 3.5 × 1 + 4.0 × 1 + 4.0 × 0.5 = 5.0 + 3.5 + 4.0 + 2.0 = 14.5.
Total credits: 3.5.
Weighted GPA = 14.5 ÷ 3.5 = 4.14
Half-credit classes count for half as much. Treating Health as a full credit here would give 4.13 — small in this case, but it adds up across a transcript.
Which number colleges use
Many colleges recalculate GPA using their own method — often unweighted, core subjects only. Report what your school puts on your transcript, and do not worry if a college's number differs. Course rigour still shows on your transcript.
Calculate your course grade in the grade calculator and your weighted GPA in the weighted GPA calculator.
Frequently asked questions
Multiply each category average by its weight as a decimal, then add the results. Homework 95% at 15%, quizzes 82% at 25%, labs 88% at 20% and exams 76% at 40% give 82.75%.
Add a bonus to each weighted class, usually 0.5 for honours and 1.0 for AP or IB, then average the grade points as normal. An A in an AP class counts as 5.0.
Use: needed = (target − current × (1 − final weight)) ÷ final weight. With 84% now and a final worth 30%, an 85% overall needs about 87.3% on the final.
No. It only changes the average inside that category. The category keeps the same weight in your course grade.