To calculate your GPA, you convert each letter grade into a number on a 4.0 scale, then average those numbers. The math is straightforward once you know the point values, and you can do it by hand in a few minutes with nothing more than your transcript and a calculator.
The 4.0 Grade Point Scale
Every letter grade translates to a specific number of grade points. Here’s the standard scale used by most high schools and colleges:
- A = 4.0
- A- = 3.67
- B+ = 3.33
- B = 3.0
- B- = 2.67
- C+ = 2.33
- C = 2.0
- C- = 1.67
- D+ = 1.33
- D = 1.0
- D- = 0.67
- F = 0.0
Some schools don’t use plus/minus grading. In that case, the scale simplifies: A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0. Check your transcript or school handbook to see which version your school uses.
The Simple Method: Equal-Weight Classes
If all your classes carry the same number of credits (common in high school), calculating your GPA takes two steps. First, convert every letter grade to its point value. Second, add those values together and divide by the number of classes.
Say you took five classes this semester and earned three A’s, one B, and one C. That gives you:
4.0 + 4.0 + 4.0 + 3.0 + 2.0 = 17.0
Divide 17.0 by 5 classes, and your GPA is 3.4.
Factoring In Credit Hours
In college, not every class is worth the same number of credits. A four-credit lecture counts more toward your GPA than a one-credit lab. To account for this, you need to calculate what’s called “quality points” for each course.
For each class, multiply the grade points by the number of credit hours. A B (3.0) in a four-credit course gives you 12.0 quality points. An A (4.0) in a one-credit course gives you 4.0 quality points. After you’ve done this for every class, add up all the quality points, then divide by the total number of credit hours you attempted.
Here’s a full example with four courses:
- Biology (4 credits), grade A: 4.0 × 4 = 16.0 quality points
- English (3 credits), grade B+: 3.33 × 3 = 9.99 quality points
- History (3 credits), grade B: 3.0 × 3 = 9.0 quality points
- Art (1 credit), grade A-: 3.67 × 1 = 3.67 quality points
Total quality points: 16.0 + 9.99 + 9.0 + 3.67 = 38.66. Total credits: 4 + 3 + 3 + 1 = 11. Divide 38.66 by 11, and your GPA is 3.51.
This credit-weighted method is what your college registrar uses on your official transcript. If your GPA doesn’t match what you calculated using the simple method, it’s almost certainly because your courses have different credit values.
How Weighted GPA Works
Many high schools add extra grade points for harder courses like AP, IB, or honors classes. This creates a “weighted” GPA that can go above 4.0, rewarding students who take on more challenging work.
The most common system adds 1.0 extra point for AP and IB courses and 0.5 extra points for honors courses. Under this setup, an A in an AP class is worth 5.0 instead of 4.0, and a B in an AP class is worth 4.0 instead of 3.0. An A in an honors class would be worth 4.5.
Some schools use a 5.0 scale for advanced courses, while others use a 6.0 scale. The specific bump varies by school district, so check with your guidance counselor if you’re not sure which system applies to you. Once you know the adjusted point values, the calculation works exactly the same way: add up all the grade points and divide by the number of classes.
For example, imagine you took three regular classes (two A’s and a B) and two AP classes (an A and a B). On an unweighted scale, that’s 4.0 + 4.0 + 3.0 + 4.0 + 3.0 = 18.0, divided by 5 = 3.6. On a weighted scale with the 1.0 AP bump, the AP grades become 5.0 and 4.0: 4.0 + 4.0 + 3.0 + 5.0 + 4.0 = 20.0, divided by 5 = 4.0.
Semester GPA vs. Cumulative GPA
Your semester GPA only reflects the classes you took during one term. Your cumulative GPA covers everything from the start of high school or college through the present. When people ask “what’s your GPA?” they usually mean the cumulative number, and that’s the one that appears on applications.
To calculate your cumulative GPA, gather every course from every semester. Add up all the quality points (or grade points, if your classes are equal weight) and divide by the total credits or total number of classes across all terms. You don’t average your semester GPAs together, because semesters with more credits should count more heavily. Instead, go back to the raw numbers and recalculate from scratch using the methods above.
What Doesn’t Count
Pass/fail courses typically don’t factor into your GPA. You receive credit if you pass, but because there’s no letter grade, there’s nothing to convert to grade points. Withdrawals (usually marked “W” on your transcript) also don’t affect the calculation, though they do appear on your record. Incomplete grades (“I”) are temporary and won’t factor in until a final grade replaces them.
Transfer credits can be tricky. Many colleges accept the credit hours from courses taken at another institution but don’t include the grades in your GPA at the new school. Your GPA at the new school is based only on courses taken there. If you need a combined GPA for a graduate school application, you may need to calculate it yourself using transcripts from both schools.
Checking Your Work
Most colleges provide an online GPA calculator through their advising or registrar’s office where you can plug in credit hours and letter grades to verify your math. Your student portal likely shows your current GPA as well. If your hand-calculated number doesn’t match the official one, double-check that you’re using the right grade scale (some schools don’t award A+ or use slightly different point values for plus/minus grades) and that you’re including the correct credit hours for each course.