Weighted Grade Calculator
Calculate your final course grade using weighted categories. Enter up to 5 category scores and their weights to get your overall grade.
How to use this tool
- Enter category 1 score, category 1 weight, category 2 score, category 2 weight, category 3 score and category 3 weight in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your final grade and the full breakdown beneath it.
Enter your scores and the percentage weight of each category (homework, tests, projects, etc.) to calculate your final course grade instantly.
⚠ This tool provides general estimates for education only and is not financial, tax or legal advice. Figures may not reflect your situation — verify with a qualified professional.
Formula
Final Grade (%) = (Score₁ × Weight₁ + Score₂ × Weight₂ + Score₃ × Weight₃) ÷ (Weight₁ + Weight₂ + Weight₃)
Letter grade: A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, F < 60.
How it works
Each category score is multiplied by its weight, the products are summed, and the total is divided by the sum of all weights — a weighted arithmetic mean. This approach correctly handles cases where weights do not add up to 100, as the divisor is the actual total weight rather than a fixed 100. Letter grades follow a standard 10-point scale (A/B/C/D/F) applied to the computed percentage.
Worked example
- Category 1: score = 90%, weight = 30. Category 2: score = 80%, weight = 50. Category 3: score = 70%, weight = 20.
- Weighted sum = (90 × 30) + (80 × 50) + (70 × 20) = 2,700 + 4,000 + 1,400 = 8,100.
- Total weight = 30 + 50 + 20 = 100.
- Final grade = 8,100 ÷ 100 = 81.0% → Letter grade B.
Final grade = 81.0% (Letter grade: B)
Common mistakes to avoid
- Entering weights that do not sum to 100, which causes the denominator to be wrong and the final grade to be over- or under-stated.
- Mixing percentage scores with point scores across categories without converting to a common scale first.
- Omitting a zero for a missed category — leaving it blank can exclude it from the weighted average rather than counting it as a zero.
Key terms
- Weighted mean
- An average in which each value contributes proportionally to its assigned weight rather than equally.
- Category weight
- The relative importance assigned to a grading component, such as homework, midterm, or final exam.
- Letter grade
- An alphabetical grade (A–F) assigned based on a percentage range, commonly used in North American academic systems.
- Grade point
- A numerical value assigned to a letter grade for GPA calculations (e.g. A = 4.0).
- Syllabus breakdown
- The instructor's specification of how much each assessment category contributes to the final course grade.
Frequently asked questions
- How does a weighted grade work?
- Each category is multiplied by its weight fraction and summed. For example, a 90% score on homework worth 30% contributes 27 points to your final grade.
- What if my weights don't add up to 100%?
- The calculator normalises automatically — it divides by the total weight you enter, so partial category entry still gives a meaningful average.