GPA Calculator Guide: How to Calculate Your GPA Correctly
How GPA is actually calculated from grade points and credit hours, why it's a weighted average and not a simple one, and how to combine a new semester with your cumulative GPA.
GPA looks like it should be a simple average of your letter grades, but it isn't — it's a credit-weighted average. A grade in a 4-credit course counts four times as much toward your GPA as the same grade in a 1-credit course, which is the single most common source of confusion when people try to calculate GPA by hand.
The GPA formula, step by step
- Convert each course's letter grade to a grade point using your school's scale (commonly A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0).
- Multiply each course's grade point by its credit hours to get that course's "quality points."
- Add up the quality points across every course.
- Divide the total quality points by the total credit hours.
Worked example
A student takes a 4-credit course with an A (4.0) and a 1-credit course with a C (2.0). Quality points: (4.0 × 4) + (2.0 × 1) = 16 + 2 = 18. Total credits: 4 + 1 = 5. GPA = 18 ÷ 5 = 3.60 — much closer to the A than a simple average of 4.0 and 2.0 (which would incorrectly suggest 3.0).
Combining a new semester with your cumulative GPA
The same formula extends across your whole academic history. Convert your existing cumulative GPA back into total quality points (GPA × credits so far), add this semester's new quality points, then divide by your new combined credit total. This is exactly what a registrar's system does, and it's why one strong or weak semester moves your cumulative GPA less the more credits you've already banked.
Enter your courses and prior GPA directly in the GPA Calculator and it handles both the semester and cumulative math for you.