GPA Calculator Guide: How Grade Point Average Works
GPA (Grade Point Average) compresses your entire academic record into a single number on a 4.0 scale. It's used for scholarships, honors, grad-school admissions, and even some job applications. This guide explains how it's computed and why credit weighting matters.
Letter Grades on the 4.0 Scale
Pluses and minuses shift by 0.3: A− = 3.7, B+ = 3.3, B− = 2.7, etc.
The GPA Formula
- grade point — numeric value of the letter grade
- credit hours — weight of the course (usually 3 or 4)
Courses with more credits count more heavily — an A in a 4-credit course raises your GPA more than an A in a 2-credit course.
Example: 3-credit A (4.0), 4-credit B (3.0), 3-credit C (2.0). GPA = [(4×3) + (3×4) + (2×3)] ÷ (3+4+3) = (12 + 12 + 6) ÷ 10 = 30 ÷ 10 = 3.0.
Weighted vs. Unweighted GPA
- Unweighted — capped at 4.0; an A in AP or honors counts the same as a regular A.
- Weighted — adds bonus points for harder classes (AP/IB): an A might be 5.0, pushing GPA above 4.0.
Colleges recalculate GPA their own way, often ignoring weighted bonuses or PE/arts classes. Always check each school's methodology.
Common GPA Mistakes
- Averaging GPAs instead of recalculating. A 3.5 in 3 credits + 3.0 in 4 credits is NOT 3.25 — it's (3.5×3 + 3.0×4) ÷ 7 = 3.21.
- Forgetting +/- shifts. A B+ (3.3) and a B− (2.7) differ by 0.6, not 0.
- Including pass/fail courses. These usually carry no grade points and shouldn't be in the denominator.
Put It Into Practice
Add each course with its grade and credits to see your semester or cumulative GPA instantly.
Try the GPA Calculator
Supports +/- grades, credit weighting, and multiple courses.
🎓 Open GPA Calculator →