The Basic Formula for GPA

Your GPA (grade point average) is a single number that summarizes your grades across all your courses. To calculate it, you assign each letter grade a point value, multiply that by the number of credits for the course, add all those products together, then divide by the total number of credits you took.

Most schools use a 4.0 scale: A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0. Some schools add plus and minus grades (A− = 3.7, B+ = 3.3, and so on). Check your school's grading scale first—it should be in your student handbook or on the registrar's website.

The math itself is straightforward once you have the numbers in front of you. The hardest part is usually finding out which courses count toward your GPA and how many credits each one carries.

Key Takeaways

  • Multiply each course's grade point value by its credit hours, add all those products, then divide by total credit hours to get your GPA.
  • Your school's grading scale determines the point value for each letter grade—a B is not always 3.0, so confirm your school's scale before you start.
  • Some courses (pass/fail, transfer credits, repeated courses) may not count toward GPA, so check your transcript or registrar before including them.
  • Your cumulative GPA includes all semesters; your semester GPA includes only that term's courses.
  • If you retake a course, most schools count only the new grade in your GPA, but both grades stay on your transcript.

Step-by-Step Calculation

Start by gathering your grade report or transcript. Write down the letter grade, the course name, and the number of credits for each course you took in the semester (or all semesters, if you want your cumulative GPA).

Next, convert each letter grade to its point value using your school's scale. If you earned an A in a 3-credit course, that is 4.0 × 3 = 12 grade points. If you earned a B in a 4-credit course, that is 3.0 × 4 = 12 grade points. Do this for every course.

Add up all the grade points. Then add up all the credit hours. Divide total grade points by total credit hours. The result is your GPA, rounded to two decimal places.

Example: You took four courses: A in English (3 credits), B in Math (4 credits), A− in History (3 credits), and B+ in Chemistry (4 credits). Using a 4.0 scale with plus/minus: (4.0 × 3) + (3.0 × 4) + (3.7 × 3) + (3.3 × 4) = 12 + 12 + 11.1 + 13.2 = 48.3 grade points. Total credits: 3 + 4 + 3 + 4 = 14. GPA: 48.3 ÷ 14 = 3.45.

What Counts and What Does Not

Not every grade on your transcript affects your GPA. Pass/fail courses, transfer credits from other schools, and developmental or remedial courses often do not count. Some schools exclude certain courses taken before a specific date or courses taken at community colleges.

If you retake a course, your school's policy determines whether both grades count, only the new grade counts, or only the original grade counts. Most schools count only the new grade in your GPA calculation, but both grades remain visible on your transcript. A few schools average the two grades instead.

Check your school's academic policies or ask your registrar which courses are included in GPA calculations. This information is usually in the student handbook or on the registrar's website under "Grade Point Average" or "Academic Standing."

Semester GPA Versus Cumulative GPA

Your semester GPA is calculated using only the courses you took in one term (fall, spring, or summer). Your cumulative GPA includes every graded course you have taken at your school since you started.

To calculate semester GPA, use only that term's courses in the formula. To calculate cumulative GPA, include all semesters. If you are in your second semester, add the grade points and credits from both semesters, then divide.

Schools often report both numbers. Your cumulative GPA is usually what matters for scholarships, academic standing, and graduation requirements. Your semester GPA shows how you performed in a single term and can help you spot trends (improving or declining performance over time).

Common Mistakes to Avoid

The most common error is including courses that do not count toward GPA. Before you calculate, confirm with your registrar which courses are included. Do not assume all courses on your transcript count.

Another mistake is using the wrong grading scale. If your school uses a different scale (some use 5.0 or assign different values to plus/minus grades), your calculation will be off. Always check your school's official scale first.

A third error is forgetting to weight by credit hours. A 4-credit course should count more than a 1-credit course. If you straightforward average your grades without multiplying by credits, your GPA will be wrong.

Finally, do not forget to divide by total credits, not total courses. If you took five courses with different credit values, you divide by the sum of those credit values, not by 5.

Using a Spreadsheet or Calculator

You can do this calculation by hand with a calculator, but a spreadsheet makes it faster and less error-prone, especially if you have many courses. Open a blank spreadsheet (Google Sheets, Excel, or similar) and create four columns: Course Name, Grade, Credits, and Grade Points.

In the Grade Points column, enter a formula that multiplies the grade point value by the credits. For example, if your grade is in column B and credits are in column C, type =B2*C2 (adjust the row numbers as needed). Copy this formula down for every course.

At the bottom, use SUM to add up the Grade Points column and the Credits column. Then divide total grade points by total credits in a new cell. The result is your GPA. This method is faster than hand calculation and leaves less room for arithmetic errors.

Frequently Asked Questions

Does a W (withdrawal) or I (incomplete) affect my GPA?

No. Withdrawals and incompletes do not carry grade point values, so they do not factor into your GPA. They appear on your transcript but are treated separately. An incomplete may eventually become a grade if you finish the coursework; at that point, the actual grade will count.

What if I took the same course twice?

Most schools count only the new grade in your GPA, even if it is lower than the first grade. Both grades stay on your transcript. A few schools average the two grades or count both. Check your school's repeat course policy before you retake anything.

Can I calculate my GPA if I have not finished the semester yet?

Yes, but only for the courses you have completed. If you are still in a course, you do not have a final grade yet, so you cannot include it. Once you receive all your final grades, you can recalculate to see your actual semester GPA.

Why does my calculated GPA not match what the school reports?

The most likely reason is that you included courses that do not count toward GPA (transfer credits, pass/fail courses, or developmental courses). Another reason is using the wrong grading scale. Contact your registrar and ask them to explain which courses are included in their GPA calculation.

How do I know if my GPA is good?

That depends on your goals. A 3.0 or above is often considered good for scholarships and graduate school. A 3.5 or above is competitive for many graduate programs. For jobs, employers vary—some care about GPA, many do not. Ask the school or employer what GPA they look for.