Grade Weighted Calculator
Accurately calculate your weighted average grade in seconds
Course Grading Calculator
Enter your assignments, grades, and their respective weights below.
Weighted Average Grade
0.00%
Total Weight
0%
Should equal 100%
Points Earned
0.00
Weighted points sum
Grading Scale
Standard
0-100% Scale
Formula Used: (Grade × Weight) + (Grade × Weight)… / Total Weight
Weight Distribution Chart
Grade Breakdown Table
| Assignment | Grade (%) | Weight (%) | Weighted Contribution |
|---|
What is a Grade Weighted Calculator?
A grade weighted calculator is a specialized academic tool designed to compute the final grade for a course where assignments, exams, and projects carry different levels of importance. Unlike a simple average where every number counts equally, a weighted average assigns a specific percentage "weight" to each component.
Students, teachers, and academic advisors use this tool to determine accurate standing in a class. Whether you are in high school or college, understanding how your cumulative GPA is affected by weighted courses is essential for academic planning.
Common misconceptions include thinking that a high score on a low-weighted assignment can save a grade, or that all assignments are created equal. This calculator clarifies exactly where you stand.
Grade Weighted Calculator Formula and Math
The mathematics behind the grade weighted calculator is based on the weighted mean formula. To calculate your grade manually, you multiply each assignment's grade by its corresponding weight (as a decimal), sum these products together, and then divide by the total sum of the weights.
The Formula
Weighted Grade = (g₁ × w₁ + g₂ × w₂ + … + gₙ × wₙ) / (w₁ + w₂ + … + wₙ)
Variable Explanations
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| g (Grade) | Score obtained on the assignment | Percentage (%) | 0% – 100% (sometimes >100) |
| w (Weight) | Importance of the assignment | Percentage (%) | 0% – 100% |
| Σw | Sum of all weights | Percentage (%) | Usually 100% |
Practical Examples
Example 1: The College Physics Course
Imagine a student taking a physics class with the following syllabus breakdown:
- Homework: 15% weight, Score: 90%
- Lab Reports: 25% weight, Score: 85%
- Midterm Exam: 25% weight, Score: 78%
- Final Exam: 35% weight, Score: 92%
Calculation:
(90 × 0.15) + (85 × 0.25) + (78 × 0.25) + (92 × 0.35)
= 13.5 + 21.25 + 19.5 + 32.2
= 86.45% (B Grade)
Example 2: High School History
A student has missed one assignment but aced the others. This shows the impact of missing weights.
- Essays: 40% weight, Score: 95%
- Quizzes: 20% weight, Score: 80%
- Participation: 10% weight, Score: 0% (Missed)
- Final Project: 30% weight, Score: 88%
Result: The zero in participation drags the weighted average down significantly, resulting in a final score of 80.4%.
How to Use This Grade Weighted Calculator
- Identify Grading Categories: Look at your course syllabus to find categories like "Homework," "Exams," or "Projects."
- Enter Assignments: Input the name of the assignment in the first column.
- Input Grades: Enter the percentage score you received (or expect to receive) in the "Grade" field.
- Input Weights: Enter the percentage value of that assignment in the "Weight" field. Ensure the weights eventually add up to 100%.
- Review Results: The calculator updates in real-time. Check the "Weighted Average Grade" and the chart to see which assignments are impacting your score the most.
Key Factors That Affect Grade Weighted Results
- Weight Distribution: A high grade in a category with only 5% weight (like attendance) has a minimal impact compared to a major exam worth 40%.
- Missing Assignments: In a weighted system, a zero in a high-weighted category is devastating. It is mathematically harder to recover from than in a points-based system.
- Total Weight Integrity: If your entered weights only sum to 80% (perhaps you haven't taken the final yet), the grade weighted calculator shows your current standing based on completed work.
- Extra Credit: Often applied to specific categories. If extra credit is added to a low-weight category, the boost to the final grade is dampened by the weight.
- Curve Adjustments: Some professors adjust the final calculation. This tool calculates the raw mathematical average, serving as a baseline before curves.
- Grade Cutoffs: Knowing whether an 89.5% rounds up to an A or stays a B depends on school policy, though the raw number is provided here.
Frequently Asked Questions (FAQ)
What if my weights don't add up to 100%?
If the weights don't equal 100%, the calculator computes your grade based on the total weight entered so far. This is useful for checking your current grade mid-semester before all assignments are complete.
Can I use points instead of percentages?
Yes. If your syllabus uses points (e.g., 500 total points), you can enter the points earned as the "Grade" and the total possible points for that assignment as the "Weight" to estimate the ratio, or convert them to percentages first.
Does this calculator handle letter grades?
Currently, you must input numerical values. However, the result displays a standard letter grade estimate (A, B, C, D, F) based on the calculated percentage.
How does a zero affect my weighted grade?
A zero acts as a 0% for that weighted portion. If the weight is high (e.g., 20%), a zero effectively removes 20 percentage points from your maximum possible score.
What is the difference between weighted and unweighted GPA?
Unweighted GPA treats all classes equally (usually on a 4.0 scale). Weighted GPA accounts for the difficulty of the class (Honors, AP, IB), often giving extra points. This calculator focuses on the grade within a single class.
Can I calculate my final grade needed?
Yes. Enter your current grades and weights, then add a row for your "Final Exam." Adjust the grade for the final exam until the "Weighted Average" hits your target score.
Is this accurate for college courses?
Absolutely. Most universities use a strict percentage-based weighting system, which is exactly what this grade weighted calculator computes.
Does it save my data?
For privacy reasons, this calculator runs entirely in your browser and does not store data on a server. Your data is cleared when you refresh the page.
Related Tools and Internal Resources
- GPA Calculator
Calculate your semester and cumulative GPA. - Final Grade Calculator
Determine what you need on your final exam. - College GPA Calculator
Specific GPA tools for university grading scales. - Cumulative GPA Tool
Track your performance across multiple semesters. - Test Score Calculator
See how individual test scores impact your average. - Semester Grade Calculator
Plan your semester grading strategy.
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container.appendChild(div);
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function calculateWeightedGrade() {
var grades = document.getElementsByClassName('grade-input');
var weights = document.getElementsByClassName('weight-input');
var assignments = document.querySelectorAll('[id^="assign-"]');
var totalWeightedScore = 0;
var totalWeight = 0;
var validRows = 0;
var tableBody = document.querySelector('#breakdown-table tbody');
tableBody.innerHTML = "; // Clear table
var chartLabels = [];
var chartData = [];
for (var i = 0; i < grades.length; i++) {
var gVal = parseFloat(grades[i].value);
var wVal = parseFloat(weights[i].value);
var aName = assignments[i].value || 'Assignment ' + (i + 1);
// Validation styling
var errGrade = document.getElementById('err-' + grades[i].id);
var errWeight = document.getElementById('err-' + weights[i].id);
if (grades[i].value !== '' && (isNaN(gVal) || gVal < 0)) {
errGrade.style.display = 'block';
} else {
errGrade.style.display = 'none';
}
if (weights[i].value !== '' && (isNaN(wVal) || wVal 0) {
var contribution = gVal * (wVal / 100); // Wait, if normalizing, calculation is slightly different
// Standard formula: Sum(g*w) / Sum(w)
totalWeightedScore += gVal * wVal;
totalWeight += wVal;
validRows++;
// Add to table
var tr = document.createElement('tr');
tr.innerHTML = 'Invalid weight
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