Trimester GPA Calculator
Use this trimester GPA calculator for schools that divide the academic year into three grading terms. The tool supports letter grades, percentage grades, custom course weights, course-level bonuses, excluded rows, pass/fail rows, and cumulative GPA projection.
How does this trimester gpa calculator work?
This calculator separates unweighted GPA from weighted GPA. First, it converts each grade into a base grade-point value. Then it applies course-level bonuses for trimester courses when your school allows weighting. Because GPA is usually credit-weighted, a four-credit class affects the result more than a one-credit class.
What formula is used?
Unweighted GPA = Σ(credits × base grade points) ÷ Σ(graded credits). Weighted GPA = Σ(credits × adjusted grade points) ÷ Σ(graded credits). Adjusted grade points can include honors, AP, IB, or dual-enrollment bonuses, but official schools may cap or recalculate them differently.
What should you check before trusting the result?
Check whether your school uses plus/minus grades, caps weighted points, counts transfer courses, excludes pass/fail classes, or replaces repeated courses. This calculator is built for planning and comparison, not for replacing an official transcript. For broader context, College Board BigFuture explains how GPA can be converted to a 4.0 scale, and the University of Washington registrar gives a clear example of credit-weighted GPA calculation.
Example calculation
If you earn an A in a 3-credit weighted course and your school adds a 0.5 honors bonus, the unweighted contribution is 12.0 grade points while the weighted contribution is 13.5 grade points. The calculator repeats that process for each included course, then divides by the total graded credits.
Frequently asked questions
- Multiply each course grade point by its credits, add the grade points, and divide by graded credits for that trimester.
- Use the credit value that applies to the trimester grade you are calculating.
- Yes. Select a course level and adjust the bonus values to match your school.
- Not always. Some schools weight terms differently or combine exams, so check official policy.
- Yes. Percentages are converted to letter/point values using a standard table, but your school may use different thresholds.