Rubric Grade Calculator
Score a project from its rubric criteria — with or without weights — to get an overall percentage and letter grade.
Weights total 100%.
| Criterion | Score | Weight | Contribution |
|---|---|---|---|
| Thesis | 88% (22/25) | 25% | 22 pts |
| Evidence | 86.67% (26/30) | 30% | 26 pts |
| Organization | 84% (21/25) | 25% | 21 pts |
| Mechanics | 80% (16/20) | 20% | 16 pts |
To grade from a rubric, score each criterion (earned ÷ possible × 100), multiply by its weight, add them up, and divide by the total weight. With Thesis 90% (weight 40) and Evidence 80% (weight 60): overall = (40×90 + 60×80) ÷ 100 = 8,400 ÷ 100 = 84%, a B.
How rubric grading works
A rubric breaks a project into criteria — thesis, evidence, organization, mechanics — each scored out of its own points. There are two ways to combine them. If every criterion carries equal footing, just add all the points earned and divide by all the points possible. If some criteria matter more, give each a weight and the tool takes a weighted average instead.
Leave every weight blank to grade on raw points; fill any weight in to switch to weighted mode. In weighted mode a criterion’s share of your grade comes from its weight, not its point total, so a 10-point criterion weighted 40% moves your grade more than a 30-point criterion weighted 10%.
dividing by the total weight normalizes rubrics whose weights don’t add to 100%
Worked example
Thesis 22/25 (weight 25), Evidence 26/30 (weight 30), Organization 21/25 (weight 25), Mechanics 16/20 (weight 20).
- 1 Score each criterion. 22/25 = 88%, 26/30 ≈ 86.7%, 21/25 = 84%, 16/20 = 80%.
- 2 Weight each score. 25×88 + 30×86.7 + 25×84 + 20×80 = 2,200 + 2,600 + 2,100 + 1,600 = 8,500.
- 3 Divide by total weight. Weights sum to 100, so overall = 8,500 ÷ 100 = 85%.
- 4 Map to a letter. 85% falls in the 80–89% band, so the grade is a B.
Percentage → letter grade
A common US scale. Exact cutoffs vary by instructor and institution — some use plus/minus bands, some round differently, so always check your syllabus.
| Percentage | Letter |
|---|---|
| 90–100% | A |
| 80–89% | B |
| 70–79% | C |
| 60–69% | D |
| Below 60% | F |
Reading your result
Weights that don’t total 100. No problem — the calculator divides by the total weight you actually enter, so a rubric weighted 40/30/20 (summing to 90) is normalized to that 90, not forced to 100. The result notes the sum so you can spot a typo.
Points vs. percentages. Enter the points a rubric awards (18 out of 20); the tool converts each criterion to a percentage for you. If your rubric already gives percentages, enter the percentage as “earned” and 100 as “possible”.
Cutoffs vary. The letter shown uses the common scale above. Your instructor may set different thresholds or use plus/minus grades — treat the letter as a guide, not a verdict.