IB GPA Calculator
Use this IB GPA calculator to estimate GPA when International Baccalaureate courses receive weighted grade points. 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 ib 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 IB 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
- Many schools treat IB similarly to AP and add a weighted bonus, but official policies differ.
- Normally the classroom course grade affects GPA, while IB exam results may affect diploma status or college credit.
- Yes. Use the course-level menu and bonus fields to model your school policy.
- Colleges may remove or standardize local weighting so applicants can be compared fairly.
- Use classroom grade equivalents only if your school converts predicted scores into transcript grades.