Study & writing
Weighted grade calculator
Enter the score and the weight of each graded part of the course; get your weighted average, the letter grade and how many points each part contributes.
Set the weight of an unused component to 0 so it is left out; scores already graded with weights below 100 % give your grade so far.
How a weighted average is calculated
Each graded part of a course has a score and a weight. Multiply every score by its weight, add the products, and divide by the sum of the weights: weighted average = Σ (score × weight) ÷ Σ weight. When the weights add up to 100%, the division simply turns the total back into a percentage. When they add up to less, for example because the final has not happened yet, dividing by the actual sum gives your grade so far on the same scale.
Example: homework 92% with a weight of 20%, quizzes 85% at 20%, the midterm 78% at 25% and the final 88% at 35%. The contributions are 18.4, 17, 19.5 and 30.8 points, which add up to 85.7%, a B. The plain average of the four scores would be 85.75%; the difference is small here, but it grows when your weakest result sits in the heaviest category. Without the final, the first three parts carry 65% of the weight and give 54.9 ÷ 0.65 = 84.46% so far.
| Letter | Percentage range | Grade points (4.0 scale) |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89.99% | 3.0 |
| C | 70–79.99% | 2.0 |
| D | 60–69.99% | 1.0 |
| F | below 60% | 0.0 |
This is the common ten-point scale used in many US schools. Plenty of courses add plus and minus grades or set different cut-offs, so the syllabus always wins over the letter shown here.
Getting an accurate result
Enter category averages, not individual assignments: if homework is 20% of the grade and you have ten homework scores, average them first and enter that one figure. Check whether the syllabus drops the lowest quiz or caps homework at 100%, since both change the category average before weighting.
The points column is the most practical part of the result. It shows where your grade actually comes from, so you can see which category is worth extra effort. Raising a 35% final by ten percentage points adds 3.5 points to the course grade; the same improvement on a 10% lab component adds only 1 point. If you are close to a letter boundary, look at the heaviest remaining component first. Some instructors weight by points rather than percentages; in that case enter each category's points possible as its weight and the calculator gives the same answer, because it divides by the sum of the weights.
Frequently asked questions
How do I calculate my weighted grade?
Multiply each category score by its weight, add the results and divide by the total weight. For 90% at 40% and 80% at 60%: (36 + 48) ÷ 1.0 = 84%.
What if my weights do not add up to 100%?
Divide by the sum of the weights you have. That gives your current grade based only on the graded categories, which is what most course portals display mid-term.
Is a weighted average different from a normal average?
Yes. A normal average treats every score as equally important, while a weighted average lets a final worth 35% count more than a quiz category worth 10%.