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How to Calculate Your GPA
GPA stands for Grade Point Average. The formula is:
\[\text{GPA} = \frac{\text{Total Quality Points}}{\text{Total Credit Hours}}\]Quality points for one course equal the grade value multiplied by that course’s credit hours. This weighted approach means a 4-credit course affects your GPA twice as much as a 2-credit course, which is why the classes you take matter just as much as the grades you earn.
The standard 4.0 scale
Most U.S. colleges use this scale:
| Letter grade | Grade points |
|---|---|
| A | 4.0 |
| A- | 3.7 |
| B+ | 3.3 |
| B | 3.0 |
| B- | 2.7 |
| C+ | 2.3 |
| C | 2.0 |
| C- | 1.7 |
| D+ | 1.3 |
| D | 1.0 |
| D- | 0.7 |
| F | 0.0 |
Some schools use a simpler scale without plus/minus grades. Check your institution’s grading policy for the exact values. A few universities also use a 5.0 scale or award extra points for honors and AP courses at the high school level, so the numbers here may not apply everywhere.
Worked example: semester GPA
Suppose you took five courses this semester:
| Course | Grade | Grade points | Credit hours | Quality points |
|---|---|---|---|---|
| Biology 101 | A | 4.0 | 4 | 16.0 |
| English 201 | B+ | 3.3 | 3 | 9.9 |
| Statistics 150 | A- | 3.7 | 3 | 11.1 |
| History 110 | B | 3.0 | 3 | 9.0 |
| Art 100 | A | 4.0 | 2 | 8.0 |
Multiply each course’s grade points by its credit hours to get quality points (the rightmost column). Add up all quality points: 16.0 + 9.9 + 11.1 + 9.0 + 8.0 = 54.0. Add up all credit hours: 4 + 3 + 3 + 3 + 2 = 15. Divide: 54.0 / 15 = 3.60. Your semester GPA is 3.60. You can verify this with the GPA calculator.
A second example with lower grades
Consider a different semester with four courses:
| Course | Grade | Grade points | Credit hours | Quality points |
|---|---|---|---|---|
| Chemistry 201 | C+ | 2.3 | 4 | 9.2 |
| Philosophy 101 | A- | 3.7 | 3 | 11.1 |
| Calculus 152 | C | 2.0 | 4 | 8.0 |
| Music 100 | A | 4.0 | 2 | 8.0 |
Total quality points: 9.2 + 11.1 + 8.0 + 8.0 = 36.3. Total credit hours: 4 + 3 + 4 + 2 = 13. GPA: 36.3 / 13 = 2.79. Notice how the two 4-credit courses with C-range grades pull the GPA down significantly. The A in Music 100 helps, but because it is only 2 credits, it cannot offset the weight of 8 credits of C-level work.
Why credit hours matter
The credit-hour weighting exists because courses are not equal in workload or depth. A 4-credit lab science course represents more instruction time than a 2-credit elective, so the GPA formula gives it proportionally more weight. This means a B in a 4-credit course pulls your GPA down more than a B in a 2-credit course. It also means a strong grade in a high-credit course lifts your GPA more than the same grade in a lighter course.
This is worth keeping in mind during course selection. If you are taking a difficult 4-credit course you expect to struggle in alongside an easy 2-credit elective, the hard course will dominate the semester’s GPA regardless of what you earn in the elective.
How to calculate cumulative GPA
Cumulative GPA works the same way, but across all semesters combined. You do not average your semester GPAs together. Instead, you go back to the raw quality points and credit hours. The complete guide to GPA and grades walks through this in detail, but here is the short version.
If your first semester produced 54.0 quality points over 15 credits (GPA: 3.60), and your second semester produced 41.6 quality points over 14 credits (GPA: 2.97), your cumulative GPA is (54.0 + 41.6) / (15 + 14) = 95.6 / 29 = 3.30. Notice that 3.30 is not the average of 3.60 and 2.97 (which would be 3.285). The difference exists because the two semesters have different numbers of credit hours. The first semester’s 15 credits carry more weight than the second semester’s 14 credits. Use the cumulative GPA calculator to combine multiple semesters quickly.
A common mistake: averaging semester GPAs
The single most frequent GPA calculation error is adding up semester GPAs and dividing by the number of semesters. A student with a 3.80 from a 12-credit semester and a 3.20 from an 18-credit semester might assume their cumulative GPA is (3.80 + 3.20) / 2 = 3.50. The actual cumulative GPA is (45.6 + 57.6) / (12 + 18) = 103.2 / 30 = 3.44. The heavier semester pulls the cumulative number closer to its own GPA. This error gets larger as the credit-hour difference between semesters grows.
Common questions
All credit hours count equally in the formula. A 4-credit course has twice the impact on your GPA as a 2-credit course, regardless of the subject.
Most schools exclude pass/fail courses from GPA calculations entirely. They do not add quality points or credit hours to the totals. This is worth knowing if you are deciding whether to take a course pass/fail. Choosing pass/fail removes the risk of a low grade hurting your GPA, but it also removes the possibility of a high grade helping it. If you are confident you will earn an A in a 4-credit course, taking it for a letter grade adds 16 quality points to your total. Taking it pass/fail adds nothing.
If you want to raise a low GPA, taking more credit hours in a semester gives those grades more weight. A full 18-credit semester of strong grades will move a cumulative GPA faster than a light 12-credit semester. But the further you are into your program, the harder it is to move the cumulative number, because you have more total credit hours in the denominator. A student with 90 credits completed would need far more quality points to shift their GPA by 0.1 than a student with only 30 credits completed.