Weighted Grade Calculator
Enter the grade and the weight for each assignment or category, and the calculator returns your overall weighted grade. Weights do not have to add up to 100; the result is normalized either way.
How to calculate weighted grade
A weighted grade gives each assignment influence in proportion to its weight, so a 30% final counts more than a 5% quiz. Multiply each grade by its weight, add those products together, then divide by the total of the weights. Dividing by the total weight normalizes the result, so it stays correct even if your weights do not add up to exactly 100. Leave a row blank (weight 0) and it is ignored, which lets you compute a running grade partway through a term.
Weighted grade = sum(grade x weight) / sum(weight)
Worked example
You have a 90 on homework (20% of the grade), 85 on the midterm (30%), and 80 on the final (50%).
- Multiply each grade by its weight: 90 x 20 = 1,800; 85 x 30 = 2,550; 80 x 50 = 4,000
- Add the products: 1,800 + 2,550 + 4,000 = 8,350
- Add the weights: 20 + 30 + 50 = 100
- Divide: 8,350 / 100 = 83.5
Result: Your overall weighted grade is 83.5%.
Frequently asked questions
How do you calculate a weighted grade?
Multiply each grade by its weight, add the results, then divide by the sum of the weights. For grades of 90, 85, and 80 weighted 20%, 30%, and 50%, the weighted grade is (90x20 + 85x30 + 80x50) / 100 = 83.5%.
Do the weights have to add up to 100%?
No. Because the formula divides by the total of the weights, any set of weights works. If your categories add up to 100, the division is by 100; if they add up to something else, the result is still correctly normalized. This is handy mid-term when you have not yet completed every category.
What is the difference between a weighted and an unweighted grade?
An unweighted (simple) average treats every score equally. A weighted average lets some scores count more, based on their weight. If a final exam is worth 50% and a quiz 5%, the weighted average reflects that, while a simple average would wrongly treat them as equal.
How do I find the grade I need on the final?
Enter your current category grades and weights, leave the final's grade blank, and note the weight reserved for it. Then test final scores in that row until the weighted grade hits your target. Trying a few values quickly shows the score you need.