How to Calculate GPA: Weighted, Unweighted and Credit-Hour GPA
Calculate GPA step by step: convert letter grades to points, weight honors and AP classes, use credit hours, and find your cumulative GPA, with examples.
By Awais, Founder and editor-in-chiefPublished
To calculate your GPA, convert each letter grade to grade points (on the usual 4.0 scale, A = 4, B = 3, C = 2, D = 1, F = 0), add them up, and divide by the number of classes. In college, multiply each grade by the class’s credit hours first, then divide by total credits.
That is the whole method. The details that trip people up are plus and minus grades, weighted classes and credit hours, so each is worked through below with real numbers.
Step 1: Convert grades to points
Most US high schools and colleges use a 4.0 scale. The College Board’s guide to the 4.0 scale maps whole letter grades to points and notes that schools differ on cutoffs and on whether they use plus and minus grades.
A common plus/minus scale looks like this:
| 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 | 65–66 |
| F | 0.0 | below 65 |
Your school’s handbook is the final word. Some give A+ a 4.3, some use 90/80/70 cutoffs with no plus or minus grades, and some colleges ignore pluses and minuses when they recalculate your GPA. If you only have percentages, the grade calculator helps you turn marks into a final course grade first.
Step 2: Unweighted GPA (high school)
An unweighted GPA treats every class the same. Add the points and divide by the number of classes.
Example: six classes in one semester.
| Class | Grade | Points |
|---|---|---|
| English | A | 4 |
| Algebra II | B | 3 |
| Chemistry (Honors) | A | 4 |
| US History | B | 3 |
| Spanish | C | 2 |
| AP Biology | B | 3 |
| Total | 19 |
Unweighted GPA = 19 ÷ 6 = 3.17.
Step 3: Weighted GPA
A weighted GPA gives extra points for harder classes. A common system adds 0.5 for honors and 1.0 for AP or IB classes, so an A in an AP class counts as 5.0. Schools set their own rules, so check yours.
| Class | Grade | Base points | Weight | Weighted points |
|---|---|---|---|---|
| English | A | 4 | — | 4.0 |
| Algebra II | B | 3 | — | 3.0 |
| Chemistry (Honors) | A | 4 | +0.5 | 4.5 |
| US History | B | 3 | — | 3.0 |
| Spanish | C | 2 | — | 2.0 |
| AP Biology | B | 3 | +1.0 | 4.0 |
| Total | 20.5 |
Weighted GPA = 20.5 ÷ 6 = 3.42.
How colleges treat weighting
Colleges often recalculate GPAs their own way. The University of California, for example, counts only A–G courses from grades 10 and 11, ignores pluses and minuses, and adds one extra point per semester of a UC-approved honors, AP or IB course, capped at eight points (no more than four from 10th grade). A D or F earns no extra point. So the same transcript can produce different GPAs at your school and at a university.
Step 4: College GPA with credit hours
In college, a 4-credit class affects your GPA more than a 1-credit class. Multiply each grade’s points by the credits to get quality points, then divide by total credits.
Example: one semester.
| Course | Credits | Grade | Points | Quality points |
|---|---|---|---|---|
| Calculus I | 4 | A | 4.0 | 16.0 |
| Physics I | 4 | B+ | 3.3 | 13.2 |
| Composition | 3 | A− | 3.7 | 11.1 |
| World History | 3 | B | 3.0 | 9.0 |
| Fitness | 1 | A | 4.0 | 4.0 |
| Total | 15 | 53.3 |
Semester GPA = 53.3 ÷ 15 = 3.55 (3.553 before rounding).
A simple average of the five grades would give (4.0 + 3.3 + 3.7 + 3.0 + 4.0) ÷ 5 = 3.60, which is wrong here because it gives the 1-credit fitness class the same weight as 4-credit calculus.
Pass/fail classes and withdrawals usually do not count toward GPA. Check your school’s rule for repeated courses, which are often replaced rather than averaged.
Step 5: Cumulative GPA
To combine semesters, add the quality points and credits from all of them. Do not average the semester GPAs, unless every semester had the same number of credits.
Example: you had 30 credits at a 3.20 GPA, then earned the 3.55 semester above.
- Earlier quality points: 3.20 × 30 = 96.0
- New quality points: 53.3
- Cumulative GPA = (96.0 + 53.3) ÷ (30 + 15) = 149.3 ÷ 45 = 3.32
What GPA do you need next term?
Work backwards from your target. Suppose you want a 3.40 cumulative GPA after another 15 credits (60 in total).
- Quality points needed: 3.40 × 60 = 204.0
- Quality points you have: 149.3
- Needed next term: 204.0 − 149.3 = 54.7, so 54.7 ÷ 15 = 3.65
The more credits you have already completed, the harder it is to move your cumulative GPA, which is why early semesters matter so much. The GPA calculator does this target calculation for you.
Common mistakes
- Averaging semester GPAs instead of combining quality points and credits.
- Ignoring credit hours in college.
- Mixing scales, such as adding a 4.3 A+ when your school caps at 4.0.
- Rounding too early. Keep two or three decimals until the final answer.
- Counting pass/fail classes that your school leaves out of the GPA.
Outside the US
Many countries use different systems. In India, schools and universities usually report a CGPA on a 10-point scale; our guide on converting CGPA to percentage lists the official formulas. If you need to express marks as a percentage, the percentage calculator helps.
FAQ
How do I calculate my GPA quickly?
Convert each grade to points (A = 4, B = 3, C = 2, D = 1, F = 0), add them and divide by the number of classes. In college, multiply each grade by its credit hours first and divide by total credits.
What is the difference between weighted and unweighted GPA?
Unweighted GPA counts every class on the same 0–4 scale. Weighted GPA adds extra points for honors, AP or IB classes, so it can go above 4.0.
Is a 3.5 GPA good?
A 3.5 is roughly a B+ to A− average on a 4.0 scale. Whether it is “good” depends on your goals; selective colleges and scholarships often look for higher, and they also weigh how hard your classes were.
Do colleges look at weighted or unweighted GPA?
Many recalculate GPA using their own rules. The College Board advises asking each admissions office how it evaluates GPA.
How do I convert a percentage to GPA?
Turn the percentage into a letter grade using your school’s cutoffs, then into points. For example, 88% is a B+ on many scales, which is 3.3 points.