Free grade calculator
Semester grade calculator with custom weights
Combine quarter, trimester, and final-exam grades using your school's exact weighting. Add or rename terms and see the semester average instantly.
Free · No sign-up · Instant results · Grades stay in your browser
Quarter and exam weights
Grades can exceed 100% when extra credit applies.
89.00%
B+Weights total 100%. This is the complete weighted result.
Total weight
100%
- 1
List each grading period
Add quarters, trimesters, exams, or projects that count separately.
- 2
Copy the official weights
Use percentages from the course syllabus or school handbook.
- 3
Check the semester result
Confirm the weights total 100%, then model unfinished terms if needed.
Semester grade calculator with custom weights
A semester grade calculator combines grading periods and exams according to your school's weighting policy. A common high-school formula gives Quarter 1 and Quarter 2 forty percent each, then gives the final exam twenty percent. Other schools use 45/45/10, equal trimesters, or a separate project weight. Enter the grades and weights from your handbook rather than assuming every term counts equally.
Semester grade formula
Multiply each grading-period grade by its weight, add the products, and divide by the total weight: semester grade = Σ(term grade × term weight) ÷ Σ(term weight). With an 88 in Quarter 1, 92 in Quarter 2, and 85 on a final weighted 40/40/20, the semester grade is (88×40 + 92×40 + 85×20) ÷ 100 = 89%.
Quarter and final-exam weights
Check the course syllabus or student handbook for the official policy. The final might count inside Quarter 2, as a separate semester component, or not at all. Add each component only once. If an LMS already includes the final in a quarter average, do not add it again as a separate row.
Calculating before the semester ends
When only the first quarter is complete, the calculator normalizes the average across the weights entered. To project a final semester grade, add expected scores for unfinished terms and the exam. Change those estimates to see which component has the most leverage.
Rounding and official grades
The calculator displays two decimal places and a standard US letter-grade estimate. Schools may round differently or use alternate cutoffs, so the gradebook remains the official result. A displayed 89.50% might become an A, remain a B+, or be truncated depending on local policy.
Got questions?
Semester grade calculator FAQ
Answers to common questions from teachers. Still stuck? Email john@gradewithai.com — replies land the same day.
Multiply each quarter, trimester, or exam grade by its percentage weight, add the products, and divide by the total weight.
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Use the calculator that matches the gradebook question: weighted categories, a required final-exam score, or a semester average.
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