Learn how to calculate a weighted grade point average from course credits and grade points and how prior credits can be included.
How GPA is calculated
GPA is a credit-weighted average: multiply each course grade point by its credits, add those products, then divide by total credits.
Choosing a scale
The calculator supports common 4.0, 5.0 and 10.0 numeric scales. Institutions can use different grade policies, so the selected scale must match the school or university.
Credits matter
A three-credit course contributes more to a credit-weighted GPA than a one-credit course with the same grade point.
Prior cumulative GPA
If you already have a cumulative GPA and completed-credit total, the calculator can combine those with new coursework for a broader estimate.
Letter grades and grade points
If your institution uses letter grades, first map them to the institution’s official point values rather than assuming every school uses the same mapping.
Examples
A 4-credit course with a 3.0 grade point contributes 12 grade points. Four such courses would produce a 3.0 GPA if all credits and grades are equal.
Worked example: credit-weighted GPA
Suppose a student completes a 3-credit course at 4.0 and a 1-credit course at 2.0. The quality points are 12 and 2, so the GPA is 14 ÷ 4 = 3.50. A simple average of 4.0 and 2.0 would incorrectly give 3.00.
Why institutional rules matter
Letter-grade mappings, repeated courses, withdrawals, pass/fail courses and transfer credits can be handled differently by institutions. A mathematical GPA estimate should use the school's published rules.
Use the result for planning
A calculated GPA can help with scenario planning, but official transcripts and institutional calculations remain authoritative for admissions, progression and awards.
Credit-Weighted GPA Formula
Quality points for a course are calculated as grade point × course credits. Courses with more credits therefore have a larger effect on the GPA.
Worked Example
A 3-credit course with a 4.0 grade point contributes 12 quality points. A 1-credit course with a 2.0 grade point contributes 2. The combined GPA is 14 ÷ 4 = 3.50.
Cumulative GPA
When prior credits and a prior cumulative GPA are known, prior quality points can be combined with the new course quality points. Do not simply average the old and new GPAs unless their credit totals are equal.
Grade-Point Scales Differ
Institutions can use 4.0, 5.0, 10.0 or other scales and may assign different points to letter grades. Use the official mapping supplied by the institution rather than assuming a universal conversion.
Repeated Courses and Special Grades
Repeated courses, withdrawals, pass/fail courses, transfer credits and academic exclusions may be handled differently by schools. A mathematical calculator cannot infer those institutional policies.
Planning vs Official GPA
Use a calculated GPA for planning and scenario analysis. Official transcripts and institutional calculations remain authoritative for admissions, progression, scholarships and awards.
Use the Tervilo GPA Calculator
Use the Tervilo GPA Calculator to calculate credit-weighted GPA scenarios using the scale and course rules applicable to your institution.