Grade Calculator
Calculate your GPA with support for 4.0, 4.3, and 4.5 scales.
This tool calculates GPA using standard weighted average formulas (4.0, 4.3, 4.5 scales). All calculations run locally in your browser.
How GPA Calculation Works
GPA (Grade Point Average) is calculated by dividing the total number of grade points earned by the total number of credit hours attempted. The formula is: GPA = Σ(Grade Points × Credits) ÷ Σ(Credits). For example, if you earned an A (4.0) in a 3-credit course and a B+ (3.3) in a 4-credit course, your GPA would be (4.0×3 + 3.3×4) ÷ (3+4) = 25.2 ÷ 7 = 3.6.
How GPA Calculation Works▾
GPA (Grade Point Average) is calculated using a weighted average formula: GPA = Sum(grade_points * credit_hours) / Sum(credit_hours). Each letter grade maps to a numeric value on the selected scale.
On a 4.0 scale: A=4.0, B=3.0, C=2.0, D=1.0, F=0.0
On a 4.3 scale: A+=4.3, A=4.0, A-=3.7, B+=3.3, ...
On a 4.5 scale: A+=4.5, A=4.0, A-=3.5, B+=3.3, ...
The tool multiplies each course's grade points by its credit hours, sums these products, and divides by the total credit hours. This produces a weighted GPA that accounts for the relative importance of each course.
Input validation prevents negative credit hours, NaN values, and ensures at least one valid course entry before calculation.
Step-by-Step Usage Guide▾
1. Select your grading scale (4.0, 4.3, or 4.5).
2. Enter your first course: select the grade and enter credit hours.
3. Click "Add Course" to add more courses.
4. Your cumulative GPA is calculated automatically.
5. Remove individual courses with the delete button.
6. The tool shows both the weighted GPA and total credits.
Understanding GPA Scales▾
4.0 Scale: The most common scale in US universities. A=4.0 is the highest possible GPA. Used by most graduate school admissions.
4.3 Scale: Includes plus/minus gradations. A+=4.3 allows students to exceed 4.0. Common in some Canadian and US institutions.
4.5 Scale: Used in some Korean and international universities. A+=4.5 provides even finer grade differentiation.
Cumulative GPA vs Semester GPA: Cumulative GPA considers all courses across all semesters. Semester GPA only considers courses in a single semester. This tool calculates based on the courses you enter, so it can serve both purposes.
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Frequently Asked Questions
How is GPA calculated?▾
GPA = Σ(Grade Points × Credit Hours) / Σ(Credit Hours). Each letter grade is assigned a point value (e.g., A+ = 4.5, A = 4.0), which is multiplied by the credit hours for that course. The total grade points are then divided by the total credit hours.
What is the difference between 4.0, 4.3, and 4.5 scales?▾
The 4.0 scale caps at A=4.0. The 4.3 scale allows A+=4.3. The 4.5 scale allows A+=4.5. Different universities use different scales — select the one your institution uses.
Can I use this for graduate school applications?▾
Yes. This calculator uses standard GPA formulas accepted by most institutions. However, some graduate programs may recalculate GPA using their own criteria.