Grade Calculator
Combine homework, quizzes, midterms, and finals into a single overall course grade using each category's weight.
- Homework18.40 pts
- Quizzes12.75 pts
- Midterm19.50 pts
- Final35.20 pts
What this calculator does
The Grade Calculator computes your overall course grade by weighted average. Each category — homework, quizzes, lab, midterm, final, project — has its own score and weight. The tool shows the running weighted total, the letter equivalent on the standard 10-point scale, and the share of the course already accounted for.
Formula
overall = Σ(scorei × weighti) ÷ Σ(weighti)
If Σ(weight) = 100, the denominator drops out and overall = Σ(score × weight) / 100.
Variable definitions
score— The percentage grade earned in a category (0–100).weight— The category's share of the final course grade, usually in percent (e.g. 30 means 30% of the course).
Step-by-step calculation
- List every category in the course with its score and weight.
- Multiply score × weight for each row to get the contribution.
- Sum all contributions and sum all weights.
- Divide the contribution sum by the weight sum to get the overall grade.
- Map the overall percentage to a letter grade using the standard scale (A ≥ 90, B ≥ 80, …).
Worked example
A typical course:
- Homework: 92% × 20 = 18.40
- Quizzes: 85% × 15 = 12.75
- Midterm: 78% × 25 = 19.50
- Final: 88% × 40 = 35.20
Sum of contributions = 85.85; sum of weights = 100.
Overall = 85.85 ÷ 100 = 85.85% (B).
How to use this calculator
- Enter each grading category from your syllabus (name optional).
- Enter the percentage score earned and the category's weight.
- Add or remove rows so the layout matches your course.
- Check that the weights total 100% if you want a final course grade — the calculator shows the running total.
- Read the overall percentage and the standard letter equivalent.
Common mistakes
- Weights that don't total 100: the math is still valid for a partial grade, but the result is only your grade so far, not your projected final.
- Entering raw points: turn 17/20 into 85% first, or use the Weighted Grade calculator which accepts raw points.
- Ignoring drop policies: if the syllabus drops your lowest quiz, average the remaining quizzes before entering the category score.
- Mixing decimal weights: 0.30 and 30 both work as long as every row uses the same convention.
Frequently asked questions
›How is a course grade calculated?
Multiply each category's score by its weight, sum those products, and divide by the sum of weights. The result is the overall course grade in the same units as the scores you entered.
›Do the weights have to add up to 100%?
If you've entered every category in the course, the weights should total 100. If you're only checking a partial grade so far, the calculator returns the grade relative to the weights you've entered and shows the percentage of the course covered.
›What's the difference between this and a weighted-grade calculator?
The grade calculator works at the category level (homework, quizzes, midterm, final). The Weighted Grade calculator works at the individual-assignment level, with score-out-of-total inputs.
›Can I enter raw points instead of percentages?
Convert each category to a percentage first (your earned points ÷ total possible points × 100), then enter that. Or use the Weighted Grade calculator which accepts raw points directly.
›What if I haven't taken the final yet?
Skip the final's score field (or leave it 0 with weight 0 for now) and use the Final Grade calculator to see the score you need on the final to reach a target.
›How are letter grades assigned from a percentage?
Most U.S. courses use 90+ = A, 80–89 = B, 70–79 = C, 60–69 = D, below 60 = F. Plus / minus thresholds vary; the calculator displays both the numeric grade and the standard letter.
›Why does the result differ from my school's portal?
Schools may apply curves, drop the lowest score in a category, weight extra credit, or use different boundary rules. The calculator uses straight weighted averages; check the syllabus for any adjustments.
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