How to Calculate High School & College GPA (Weighted vs. Unweighted)

Grade Point Average (GPA) is the primary metric used by high schools, universities, and graduate programs to evaluate academic performance.

However, because schools utilize different grading systems—such as unweighted (4.0 scale) and weighted (5.0 scale)—calculating your true cumulative GPA requires understanding credit weight distribution.

Standard 4.0 Unweighted Grade Scale

In an unweighted system, letter grades are assigned numerical quality points regardless of course difficulty:

• A (90–100%): 4.0 Grade Points
• B (80–89%): 3.0 Grade Points
• C (70–79%): 2.0 Grade Points
• D (60–69%): 1.0 Grade Point
• F (Below 60%): 0.0 Grade Points

Unweighted GPA Formula & Calculation

The standard GPA formula is:

Example Calculation:

Suppose a college student takes 4 courses in a semester:

• English (3 credits): Grade A (4.0 pts) → 3 × 4.0 = 12.0 quality points
• Calculus (4 credits): Grade B (3.0 pts) → 4 × 3.0 = 12.0 quality points
• Chemistry (4 credits): Grade A (4.0 pts) → 4 × 4.0 = 16.0 quality points
• History (3 credits): Grade C (2.0 pts) → 3 × 2.0 = 6.0 quality points

Total Quality Points: 12.0 + 12.0 + 16.0 + 6.0 = 46.0
Total Credits: 3 + 4 + 4 + 3 = 14
Semester GPA: 46.0 / 14 = 3.285 (3.29 GPA)

Weighted GPA Explained (AP / IB / Honors)

To reward students taking challenging coursework, high schools use weighted scales:

• Honors Courses: Add +0.5 weight (An 'A' = 4.5 pts)
• AP (Advanced Placement) / IB Courses: Add +1.0 weight (An 'A' = 5.0 pts)

Step-by-Step Weighted GPA Example

If an AP Calculus student earns an 'A', it yields 5.0 grade points instead of 4.0. Dividing total weighted points by total credits gives a weighted GPA above 4.0 (e.g., 4.35 GPA).

Calculate your semester and cumulative grades using our GPA Calculator or Grade Calculator, and browse all Math & Educational Tools.