How to use the Weighted Grade Calculator
- Write each item as a score and its weight, for example “92 20” for a score of 92 that counts for 20%.
- Separate items with commas: 92 20, 85 30, 78 50.
- Read your weighted grade and the total weight entered.
- Add or change items to see how future scores would affect your grade.
Formula used
Weighted grade = Σ(score × weight) ÷ Σ(weight). Example: (92 × 20 + 85 × 30 + 78 × 50) ÷ 100.
Worked example
Here is the Weighted Grade Calculator worked through with the example values shown above, so you can check each step by hand.
| Inputs | |
|---|---|
| Score and weight, per item | 92 20, 85 30, 78 50 |
| Result | |
| Weighted grade | 82.9% |
| Total weight entered | 100% |
| What it means | All the weights are entered, so this is your overall grade. |
How a weighted grade works
Multiply each score by its weight, add the results and divide by the total weight. For 92 (20%), 85 (30%) and 78 (50%): 92 × 20 = 1,840, 85 × 30 = 2,550 and 78 × 50 = 3,900. The sum is 8,290, and dividing by 100 gives 82.9%.
A simple average of the three scores would be 85%, which is 2.1 points higher than the weighted result, because the lowest score has the largest weight.
When weights do not add up to 100
If you have only some of the grades, enter what you have. With 90 (40%) and 80 (20%), the weights total 60, and the calculator gives 86.7%, your grade on the 60% graded so far, with 40% still to come.
This is your current standing, not a final grade. Use the final grade calculator on this site to find the score you need on the remaining work.
Using it to plan
Add a hypothetical score to see its effect. If the 50%-weight exam above went from 78 to 90, the grade would rise to 88.9%. If it fell to 60, the grade would be 73.9%.
Heavily weighted items matter most, so put your effort into them. A single low score in a small category rarely changes your grade much.
Check your syllabus
Teachers use many schemes: weights by category, dropped lowest scores, extra credit and curved grades. This calculator handles plain weighted averages. If your course uses categories, calculate each category’s average first and enter it with its weight.
Rounding rules differ by school. Check how your teacher rounds final grades and how percentages map to letter grades.
Dropped scores and extra credit
Some courses drop the lowest quiz or homework score, which raises the category average. If your quiz scores are 60, 85, 90 and 95, the average is 82.5, but dropping the 60 raises it to 90. Enter the adjusted category average as one item with the category’s weight.
Extra credit works by letting a score exceed 100, which the calculator accepts. As a check, a 90 worth 40% and an 80 worth 60% give 84%. Always confirm the exact rules in your syllabus, since schools differ on rounding, curves and what counts.
Frequently asked questions
What if the weights do not add up to 100?
Then the result is your grade on the work entered so far, scaled to those weights.
Can I use letter grades?
Enter percentages. Convert letter grades to the percentage your teacher uses.
How do I enter categories?
Average the scores within each category first, then enter the average with the category’s weight.
What is the difference between a weighted and a simple average?
A simple average treats every score equally. A weighted average gives more importance to items with a higher weight.
Does it handle extra credit?
Enter a score above 100 if the item allows it. The calculator accepts any number.
How can I find the score I need?
Use the final grade calculator to find what you need on the remaining item to reach a target grade.
How do I enter a category with several scores?
Average the scores in the category first, then enter that average with the weight of the whole category.
This calculator gives estimates for information only. Actual figures from a bank, employer, tax authority or doctor may differ. It is not financial, tax, legal or medical advice.