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Semester Grade Calculator: quarters and finals in one number
Enter each grading period (Quarter 1, Quarter 2, Final Exam) with its grade and weight to see your combined semester grade.
Common setups
How schools typically weight a semester
There’s no single national standard — weighting is set at the district or teacher level. A few common patterns:
Always confirm the exact split in your syllabus or student handbook — the calculator above works with whatever weights you enter.
Here’s how the same two quarter grades produce noticeably different semester results under two common splits:
| Split Used | Q1: 78% | Q2: 94% | Final: 85% | Semester Grade |
|---|---|---|---|---|
| 40 / 40 / 20 | 31.2 | 37.6 | 17.0 | 85.8% |
| 45 / 45 / 10 | 35.1 | 42.3 | 8.5 | 85.9% |
| Equal thirds | 26.0 | 31.3 | 28.3 | 85.6% |
In this case the three splits land within half a point of each other because the two quarters were fairly close together. The gap widens noticeably when quarters are far apart — a student with a rough Q1 and a strong Q2 will see a meaningfully different semester grade depending on which split their school uses.
A common trap
Don’t average an already-averaged number twice
A frequent mistake is treating a quarter grade that’s already a weighted average as if it were a single raw score, then re-weighting it again incorrectly alongside individual assignments. Keep grading periods and individual assignments in separate calculations — use this tool for combining finished quarter/term grades, and the main Grade Calculator for combining individual assignments within a single term.
FAQ
Semester grade questions
How is a semester grade calculated from quarters?
Most schools weight each quarter equally with a smaller final exam weight, then combine them — but check your own school’s exact policy.
Does every school weight the same way?
No, weighting varies by district and teacher. Always confirm the percentages in your syllabus.
What if my school uses trimesters instead of semesters?
The same tool works — just add one row per trimester instead of per quarter, using whatever weights your school assigns to each.
Can I use this to combine two semesters into a yearly grade?
Yes — enter each semester as its own row with its weight (often 50/50 for a full-year course), the same way you would combine quarters.