Weighted Grade Calculator
Weighted grade = Σ(category score × weight) ÷ Σ(weights)
How Weighted Grade Averages Work
A weighted grade average assigns different importance to different components of your coursework. Unlike a simple mean where every score counts equally, weighted averaging multiplies each category score by its weight before combining. The formula is: weighted average = (score₁ × weight₁ + score₂ × weight₂ + …) ÷ total weight. When weights sum to 100%, the result is your overall percentage grade.
Weighted grading mirrors how instructors structure syllabi. A final exam worth 40% of your grade affects your average twice as much as a 20% midterm. If you score 70% on the midterm and 95% on the final, your combined score is (70 × 20 + 95 × 40) ÷ 60 = (1400 + 3800) ÷ 60 = 86.7%, not the simple average of 82.5%. Understanding this distinction helps you allocate study time to high-weight categories.
Common weighting schemes include homework (10–20%), quizzes (10–15%), midterm (20–30%), and final (25–40%). Lab courses may split lecture and lab components. Group projects sometimes carry heavy weights — a single weak presentation can disproportionately affect your semester result. Building a spreadsheet is tedious; this calculator handles the arithmetic instantly.
When weights do not total exactly 100%, your grade reflects only the portion of the course represented by entered categories. A syllabus might list 85% of weights explicitly, leaving 15% for a future assignment. The calculator flags when weights deviate from 100% so you know whether you are viewing a partial or complete grade picture.
| Letter Grade | Percent Range | GPA Points |
|---|---|---|
| A+ / A | 93–100% | 4.0 |
| A- | 90–92% | 3.7 |
| B+ | 87–89% | 3.3 |
| B | 83–86% | 3.0 |
| B- | 80–82% | 2.7 |
| C+ | 77–79% | 2.3 |
| C | 73–76% | 2.0 |
| C- | 70–72% | 1.7 |
| D+ | 67–69% | 1.3 |
| D | 63–66% | 1.0 |
| D- | 60–62% | 0.7 |
| F | Below 60% | 0.0 |
Enter each category name, score out of 100, and weight percentage to compute your weighted grade. The result includes the numeric percentage, letter grade, and a validation check on total weights — giving you a clear snapshot of where you stand in any weighted grading system.
Examples
| Example | Result |
|---|---|
| Midterm 75% (30%), Final 90% (40%), HW 95% (30%) | 87.5% (B+) |
| Quizzes 80% (20%), Tests 70% (50%), Project 95% (30%) | 79.5% (C+) |
| Three equal 33.3% categories at 90%, 85%, 88% | 87.7% (B+) |
| Lab 100% (25%), Lecture 72% (75%) | 79.0% (C+) |
| Participation 100% (10%), Exams 82% (60%), Paper 78% (30%) | 82.8% (B) |
| Unit 1: 88% (15%), Unit 2: 92% (15%), Unit 3: 85% (20%) | 88.3% (B+) on 50% |
| Presentation 65% (20%), Final 95% (50%), HW 90% (30%) | 88.8% (B+) |
Frequently asked questions
A simple average treats all scores equally. A weighted average gives more influence to categories with higher weight percentages, matching how most course syllabi work.
The calculator computes the average of entered categories and indicates whether weights total 100%. Partial weights show your grade for completed portions only.
Weights represent percentage importance and should be positive. They do not need to be round numbers — 12.5% and 37.5% work fine as long as they reflect your syllabus.