Accurately calculate your weighted class average and track your academic performance.
Calculate Your Weighted Grade
Enter your assignment grades and their corresponding percentage weights below.
Current Weighted Grade85.4%
70%
Total Weight Accounted
B
Letter Grade
59.8
Weighted Points Earned
Formula Used: Weighted Grade = (Σ (Grade × Weight)) / (Σ Weights). This calculation normalizes your score based on the total weight of assignments entered so far.
Grade Breakdown
Category
Grade
Weight
Contribution
Weight Distribution & Performance
Comparison of weighted points earned vs. maximum possible points for each category.
What is a Weighted Grades Calculator?
A weighted grades calculator is an essential tool for students and educators to determine the final grade in a course where assignments carry different levels of importance. Unlike a simple average where every assignment counts equally, weighted grades assign a specific percentage value (weight) to different categories such as homework, quizzes, midterms, and final exams.
Using a weighted grades calculator helps you understand exactly where you stand in a class. It prevents the common misconception that a low score on a minor homework assignment will impact your grade as heavily as a low score on a major final exam. This tool is designed for college students, high schoolers, and teachers who need accurate academic tracking.
Weighted Grades Calculator Formula
The math behind a weighted grades calculator is based on the weighted arithmetic mean. This method multiplies each grade by its corresponding weight, sums these products, and then divides by the total weight of the assignments completed.
Imagine a student, Alex, who does very well in homework and quizzes but has not taken the final yet. The syllabus breakdown is: Homework (20%), Quizzes (20%), Midterm (30%), Final (30%).
Homework: 95%
Quizzes: 88%
Midterm: 82%
Using the weighted grades calculator, we calculate the current standing based on the completed 70% of the course weight:
Despite the D grade on the midterm, the heavy weight of the projects keeps her grade in the B range. This highlights why understanding the weighted grades calculator logic is crucial for strategic studying.
How to Use This Weighted Grades Calculator
Identify Categories: Look at your syllabus to find categories (e.g., "Exams", "Labs") and their weights.
Enter Data: Input the name of the category, your grade percentage, and the weight percentage in the respective fields.
Leave Blanks for Future Work: If you haven't completed an assignment (like a Final Exam), leave the grade blank. The calculator will determine your current average based only on completed work.
Review Results: The "Current Weighted Grade" shows your standing right now. "Total Weight Accounted" tells you how much of the course is finished.
Analyze the Chart: Use the visual bar chart to see which categories are contributing the most points to your final score.
Key Factors That Affect Weighted Grade Results
Several variables can drastically influence the output of a weighted grades calculator. Understanding these can help you prioritize your study time effectively.
Weight Distribution: A category worth 40% (like a Final) is four times more impactful than a category worth 10%. A 5% drop in the Final hurts your grade more than getting a 0% on a small quiz.
Completion Percentage: Early in the semester, your grade might fluctuate wildly because the denominator (total weight) is small. One bad grade can seem catastrophic until more assignments stabilize the average.
Zero vs. Blank: In this weighted grades calculator, leaving a grade blank excludes it. Entering a "0" means you failed the assignment. Ensure you distinguish between "not done yet" and "not turned in".
Extra Credit: If your professor offers extra credit, it often adds directly to the numerator (points earned) without increasing the denominator (total weight), providing a massive boost.
Grade Scales: Different schools map percentages to letters differently (e.g., is an A 90% or 93%?). This calculator provides a standard estimate, but always check your specific syllabus.
Rounding Policies: Some institutions round 89.5% up to 90%, while others truncate. This calculator displays one decimal place for precision.
Frequently Asked Questions (FAQ)
How do I calculate what I need on the final to get an A?
You can use this weighted grades calculator by entering your current grades, then experimenting with the Final Exam grade input until the "Current Weighted Grade" hits your target (e.g., 90%).
What if my weights don't add up to 100%?
If your weights don't equal 100%, the calculator normalizes the result. For example, if you've only finished 50% of the course, your grade is calculated out of that 50%.
Does this calculator support letter grades?
Currently, this tool requires percentage inputs. If you have a letter grade (like 'B'), convert it to the middle of its range (e.g., 85%) for the best estimate.
Why is my grade lower than the simple average?
This happens if your lowest grades are in categories with the highest weights. A weighted grades calculator reveals the "true" impact of those heavy assignments.
Can I enter raw points (e.g., 18/20)?
No, please convert fractions to percentages first (18/20 = 90%) before entering them into the grade field.
Is a weighted grade the same as GPA?
No. A weighted grade is for a single class. GPA is the average of all your classes, often weighted by credit hours.
What happens if I enter a weight of 0?
Assignments with 0 weight (like practice quizzes) will not affect your calculation, even if you score 100% on them.
Is this calculator free to use?
Yes, this weighted grades calculator is completely free, runs locally in your browser, and requires no downloads.
Related Tools and Internal Resources
College GPA Calculator – Calculate your semester and cumulative GPA based on credit hours.
SAT Score Calculator – Estimate your standardized test scores based on raw data.
// Initialize calculator logic
document.addEventListener("DOMContentLoaded", function() {
calculateWeightedGrade();
});
function calculateWeightedGrade() {
var rows = 5; // Total input rows defined in HTML
var totalWeightedScore = 0;
var totalWeight = 0;
var resultTableBody = document.getElementById("resultTableBody");
var chartDataLabels = [];
var chartDataEarned = [];
var chartDataMax = [];
// Clear Table
resultTableBody.innerHTML = "";
for (var i = 1; i <= rows; i++) {
var catName = document.getElementById("cat" + i).value || "Category " + i;
var gradeInput = document.getElementById("grade" + i);
var weightInput = document.getElementById("weight" + i);
var errGrade = document.getElementById("err" + i);
var errWeight = document.getElementById("errw" + i);
// Reset errors
errGrade.innerHTML = "";
errWeight.innerHTML = "";
var gradeVal = gradeInput.value;
var weightVal = weightInput.value;
// Skip if both empty
if (gradeVal === "" && weightVal === "") {
continue;
}
var g = parseFloat(gradeVal);
var w = parseFloat(weightVal);
// Validation
var isValid = true;
if (weightVal !== "" && (isNaN(w) || w < 0)) {
errWeight.innerHTML = "Invalid weight";
isValid = false;
}
if (gradeVal !== "" && (isNaN(g) || g 0) {
// For chart: we want to show the potential weight even if grade is empty?
// Logic: If grade is empty, we don't count it in current average.
if (gradeVal !== "" && !isNaN(g)) {
var weightedPoints = (g * w); // Not dividing by 100 yet to keep precision until end
totalWeightedScore += weightedPoints;
totalWeight += w;
// Table Row
var tr = document.createElement("tr");
tr.innerHTML =
"
" + catName + "
" +
"
" + g + "%
" +
"
" + w + "%
" +
"
" + (weightedPoints / 100).toFixed(2) + " pts
";
resultTableBody.appendChild(tr);
// Chart Data
chartDataLabels.push(catName);
chartDataEarned.push((weightedPoints / 100)); // Earned points (e.g. 17 points out of 20)
chartDataMax.push(w); // Max points possible (e.g. 20)
}
}
}
// Final Calculation
var finalGrade = 0;
if (totalWeight > 0) {
finalGrade = totalWeightedScore / totalWeight;
}
// Update DOM
document.getElementById("finalGrade").innerHTML = finalGrade.toFixed(1) + "%";
document.getElementById("totalWeight").innerHTML = totalWeight.toFixed(1) + "%";
document.getElementById("pointsEarned").innerHTML = (totalWeightedScore / 100).toFixed(1);
// Letter Grade Logic
var letter = "F";
if (finalGrade >= 97) letter = "A+";
else if (finalGrade >= 93) letter = "A";
else if (finalGrade >= 90) letter = "A-";
else if (finalGrade >= 87) letter = "B+";
else if (finalGrade >= 83) letter = "B";
else if (finalGrade >= 80) letter = "B-";
else if (finalGrade >= 77) letter = "C+";
else if (finalGrade >= 73) letter = "C";
else if (finalGrade >= 70) letter = "C-";
else if (finalGrade >= 60) letter = "D";
if (totalWeight === 0) letter = "-";
document.getElementById("letterGrade").innerHTML = letter;
// Draw Chart
drawChart(chartDataLabels, chartDataEarned, chartDataMax);
}
function drawChart(labels, earned, max) {
var canvas = document.getElementById("gradesCanvas");
if (!canvas.getContext) return;
var ctx = canvas.getContext("2d");
// Handle High DPI
var dpr = window.devicePixelRatio || 1;
var rect = canvas.getBoundingClientRect();
canvas.width = rect.width * dpr;
canvas.height = rect.height * dpr;
ctx.scale(dpr, dpr);
var width = rect.width;
var height = rect.height;
// Clear
ctx.clearRect(0, 0, width, height);
if (earned.length === 0) {
ctx.font = "14px sans-serif";
ctx.fillStyle = "#666";
ctx.fillText("Enter data to generate chart", width/2 – 80, height/2);
return;
}
var padding = 40;
var chartWidth = width – (padding * 2);
var chartHeight = height – (padding * 2);
// Find max Y value (usually max weight or earned points, whichever is higher, usually weight)
var maxY = 0;
for (var i = 0; i maxY) maxY = max[i];
}
if (maxY === 0) maxY = 100;
maxY = maxY * 1.2; // Add headroom
var barWidth = (chartWidth / labels.length) * 0.4;
var spacing = (chartWidth / labels.length);
// Draw Bars
for (var i = 0; i 8) text = text.substring(0, 6) + "..";
ctx.fillText(text, x + barWidth/2, height – padding + 15);
// Value
ctx.fillStyle = "#fff";
if (hEarned > 20) {
ctx.fillText(earned[i].toFixed(1), x + barWidth/2, yEarned + 15);
}
}
// Axis Lines
ctx.beginPath();
ctx.strokeStyle = "#ccc";
ctx.moveTo(padding, height – padding);
ctx.lineTo(width – padding, height – padding); // X axis
ctx.moveTo(padding, height – padding);
ctx.lineTo(padding, padding); // Y axis
ctx.stroke();
// Legend
ctx.fillStyle = "#004a99";
ctx.fillRect(width – 150, 10, 15, 15);
ctx.fillStyle = "#333";
ctx.textAlign = "left";
ctx.fillText("Points Earned", width – 130, 22);
ctx.fillStyle = "#e9ecef";
ctx.fillRect(width – 150, 30, 15, 15);
ctx.fillStyle = "#333";
ctx.fillText("Max Possible (Weight)", width – 130, 42);
}
function resetCalculator() {
document.getElementById("cat1").value = "Homework";
document.getElementById("grade1").value = "85";
document.getElementById("weight1").value = "20";
document.getElementById("cat2").value = "Quizzes";
document.getElementById("grade2").value = "78";
document.getElementById("weight2").value = "20";
document.getElementById("cat3").value = "Midterm";
document.getElementById("grade3").value = "92";
document.getElementById("weight3").value = "30";
document.getElementById("cat4").value = "Final Exam";
document.getElementById("grade4").value = "";
document.getElementById("weight4").value = "30";
document.getElementById("cat5").value = "";
document.getElementById("grade5").value = "";
document.getElementById("weight5").value = "";
calculateWeightedGrade();
}
function copyResults() {
var final = document.getElementById("finalGrade").innerText;
var letter = document.getElementById("letterGrade").innerText;
var totalW = document.getElementById("totalWeight").innerText;
var text = "Weighted Grade Results:\n";
text += "———————–\n";
text += "Final Grade: " + final + " (" + letter + ")\n";
text += "Total Weight Accounted: " + totalW + "\n\n";
var rows = 5;
for (var i = 1; i <= rows; i++) {
var c = document.getElementById("cat" + i).value;
var g = document.getElementById("grade" + i).value;
var w = document.getElementById("weight" + i).value;
if (g !== "" && w !== "") {
text += c + ": " + g + "% (Weight: " + w + "%)\n";
}
}
text += "\nCalculated using the Free Weighted Grades Calculator";
var tempInput = document.createElement("textarea");
tempInput.value = text;
document.body.appendChild(tempInput);
tempInput.select();
document.execCommand("copy");
document.body.removeChild(tempInput);
var btn = document.querySelector(".btn-copy");
var originalText = btn.innerText;
btn.innerText = "Copied!";
setTimeout(function(){ btn.innerText = originalText; }, 2000);
}
// Resize chart on window resize
window.addEventListener('resize', function() {
calculateWeightedGrade();
});