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The Weighted Grade Calculator computes your overall course grade when the course is divided into categories that each contribute a different percentage to the final grade. Most college and high school courses use a weighted grading system: for example, homework might count for 20%, quizzes for 20%, a midterm for 25%, and a final exam for 35%. A simple arithmetic average of grades would be incorrect — the weighted average is the proper calculation.
Weighted grading is used because not all assessments are equal in their contribution to demonstrating mastery. Final exams and major projects typically carry more weight than daily homework because they assess broader, cumulative knowledge. Understanding the weight of each grade category allows students to strategically allocate study effort — spending proportionally more time on high-weight assessments maximizes grade impact.
This calculator handles three grade categories with user-defined weights. The weights do not need to be equal and ideally should sum to 100%. If they sum to less than 100% (e.g., because some assignments are not yet graded), the calculator will compute a proportional weighted average based on completed categories, giving you a projected grade based on work done so far.
The weighted average is calculated as:
$$\text{Weighted Grade} = \frac{\sum_{i=1}^{n} (Grade_i \times Weight_i)}{\sum_{i=1}^{n} Weight_i}$$
Dividing by the sum of weights (rather than assuming 100%) allows the calculator to handle cases where not all categories are complete. For a fully complete grade (weights summing to 100%), this simplifies to:
$$\text{Weighted Grade} = \sum_{i=1}^{n} (Grade_i \times \frac{Weight_i}{100})$$
For example, with homework 88% (30%), midterm 82% (30%), and final 91% (40%): Weighted Grade = (88×30 + 82×30 + 91×40)/100 = (2640 + 2460 + 3640)/100 = 87.4% = B+.
The weighted average reflects your true course grade as computed by your syllabus's weighting scheme. Use the total weight output to verify your inputs sum to 100%. If the total is less than 100%, the displayed grade is a projection based on completed categories only — it will change as remaining categories are graded. If total weight exceeds 100%, review your weight entries for errors. The letter grade follows the standard U.S. scale.
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The final exam (40% weight, 91%) heavily boosts the grade despite the lower midterm score. Final weighted average of 87.4% earns a B+.
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With only 55% of the grade determined, the projected average is 82% (B-). Enter the final category's grade and weight to see the complete course grade.
If your weights sum to less than 100%, the calculator uses a proportional average — it divides by the sum of entered weights rather than 100. This gives a useful projected grade based on completed work. This is common mid-semester when not all categories have been fully assessed. If your weights are supposed to sum to 100% but you are getting an unexpected total, recheck your syllabus — some professors specify weights per assignment rather than per category.
Yes — this is one of the most useful applications. Enter your current category grades and adjust the final category grade to different values (80, 90, 95) to see how they affect your course grade. This helps you determine the impact of a strong or weak final exam performance on your final course letter grade, allowing you to set realistic study targets and understand what grades are within reach.
A simple average treats all components equally, while a weighted average gives more influence to high-weight categories. For example, a 70% on a final exam (40% weight) has more than twice the impact on your grade as a 70% on homework (15% weight). If you scored higher on low-weight components and lower on high-weight ones, your weighted average may be lower than a simple average, and vice versa.
This calculator handles three categories. For courses with more categories (e.g., homework, quizzes, labs, midterm, final), consider combining related categories first: for example, average your homework grades into one homework category percentage, then enter that with its total weight. Alternatively, use the GPA Calculator approach — calculate each category's contribution (grade × weight / 100) and sum them manually for additional categories.
Category weights are listed in your course syllabus, typically in a grading policy or grade breakdown section. They are often expressed as percentages (Homework: 20%, Exams: 50%, Final: 30%) or as points (Homework: 200/1000 points = 20%). If your syllabus lists points rather than percentages, divide each category's max points by the total course points to get the weight percentage to enter here.
Yes. The same weighted average formula applies to high school courses. Many high schools use similar category-weighted grading systems. Some high school courses may have simpler weighting (e.g., tests 60%, homework 40%) while others are more complex with class participation, projects, and labs. Enter any combination of grades and weights — the calculator works identically regardless of education level.
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