Quarter Grade Calculator
Calculate your current quarter grade from weighted categories, or combine two or more quarter grades into one overall average — pick whichever matches how your school grades.
If your school combines quarters with a midterm and final exam into a semester grade, the Semester Grade Calculator handles that combination — this quarter grade calculator covers a single quarter or a simple quarter average instead.
What Is a Quarter Grade Calculator?
A quarter grade calculator figures out your average for a single marking period — a quarter — by combining your grades in each category, like homework, classwork, tests, and projects, according to how much each one is worth. Most schools that use a quarter system weight these categories differently, so a strong test score usually affects your quarter grade more than a single homework assignment. Report cards typically show this quarter percentage alongside a letter grade, which is exactly what this calculator returns.
This quarter grade calculator also works in reverse: if you already know your grade for each quarter and just want to combine them into one overall number, the "Combine Quarters" tab averages two or more quarter grades directly.
Standard Grading Scale for Quarter Grades
Once your quarter percentage is calculated, match it against your school's grading scale. Most U.S. schools use this baseline:
| Percentage | Letter Grade |
|---|---|
| 90–100% | A |
| 80–89% | B |
| 70–79% | C |
| 60–69% | D |
| Below 60% | F |
Example: Quarter Grade Calculation
Say your quarter is broken into Classwork (20% weight, currently 92%), Homework (15% weight, currently 88%), Tests (40% weight, currently 84%), and Projects (25% weight, currently 90%). The quarter grade calculator multiplies each category's grade by its weight, adds the results together, and divides by the total weight to get your overall quarter percentage.
| Category | Weight | Grade | Weighted Value |
|---|---|---|---|
| Classwork | 20% | 92% | 18.4 |
| Homework | 15% | 88% | 13.2 |
| Tests | 40% | 84% | 33.6 |
| Projects | 25% | 90% | 22.5 |
| Total | 100% | 87.7 |
Adding the weighted values together gives 87.7%, a B on the standard scale — this is exactly what the quarter grade calculator above computes automatically once you enter your own categories.
Quarter Grade vs. Semester Grade
A quarter grade covers one marking period on its own. A semester grade typically combines two quarters with a midterm and final exam, each carrying its own weight toward the semester total. If you need to combine full quarters, a midterm, and a final exam into one semester number, the Semester Grade Calculator is built specifically for that combination. This quarter grade calculator is for finding your standing within a single quarter, or for a simple average across two or more quarters when your school doesn't factor in a separate midterm or final exam weight.
According to Wikipedia's overview of U.S. academic grading, marking periods and their exact weighting structures vary significantly by district, so it's worth confirming your own school's exact breakdown if you want to match your report card precisely. Longwood University's guide to calculating your grade breaks down the same points-based versus weighted distinction in more depth if you're unsure which system your class uses.
Common Quarter Weighting Setups
Category weights for a quarter grade calculator vary by grade level and subject, but a few patterns show up often. Use these as a starting point if your syllabus doesn't spell out exact percentages, then adjust to match what your teacher actually published.
| Level | Typical Weighting |
|---|---|
| Elementary | Classwork 40% · Homework 20% · Tests 40% |
| Middle School | Classwork 25% · Homework 15% · Tests 35% · Projects 25% |
| High School | Homework 10% · Quizzes 20% · Tests 40% · Projects 30% |
These are common starting points, not universal rules — always enter the exact weights from your own syllabus into the quarter grade calculator above for an accurate result. If your teacher hasn't published exact percentages yet, ask directly rather than guessing, since even a small weighting difference can shift a borderline grade from a B+ to an A-.
Frequently Asked Questions
Multiply your grade in each category by its weight, add the results together, and divide by the total weight. The quarter grade calculator above does this automatically once you enter your categories, grades, and weights.
The same way as any other quarter — enter your 4th quarter's category grades and weights into the "This Quarter" tab above. There's no different math for a later quarter, just whatever categories and weights your teacher uses for that period.
Use the "Combine Quarters" tab and enter your grade for each quarter — the calculator averages them. If your school also factors in a midterm or final exam grade alongside the quarters, use the Semester Grade Calculator instead for a more accurate combined result.
92% is an A on the standard scale (90–100%).
70% is a C on the standard scale — right at the boundary between C and C-, depending on whether your school uses a plus/minus scale.
They should for an accurate quarter grade. The calculator above will still compute a result if your weights don't total 100%, but it will show a warning so you can double-check your entries against your syllabus.
26 divided by 30 is 0.867, or 86.7% — a B on the standard scale.
67% is a D on the standard scale (60–69%), just above the F cutoff.
