Work out your final grade from each item's score and weight.
Calculated locally in your browser.
How is a weighted grade calculated?
Weighted grade = Σ (grade × weight) ÷ Σ (weight). Each grade is multiplied by its weight, the products are summed, then divided by the total weight. Heavily weighted items move your grade more. Example: scores of 90, 80 and 70 with weights 40, 30 and 30 give 8100 ÷ 100 = 81%, a B.
Understanding your result
Because items are weighted, a high score on a heavily weighted exam moves your grade more than the same score on a small quiz. If your weights do not add up to 100, the calculator still works — it divides by whatever total you enter, which is handy for grading partway through a course.
Formula and method
Weighted grade = Σ (grade × weight) ÷ Σ (weight). Each grade is multiplied by its weight, the products are summed, and the total is divided by the sum of the weights.
Worked example
Scores of 90, 80 and 70 with weights 40, 30 and 30 give (90×40 + 80×30 + 70×30) ÷ 100 = 8100 ÷ 100 = 81% (a B).
How to use this tool
- Enter each item on its own line as grade, weight.
- Add an optional name before a colon, such as "Final: 70, 30".
- Read the weighted grade and letter grade.
Common mistakes to avoid
- Swapping the order — enter grade first, then weight.
- Assuming weights must total 100; they do not have to.
- Leaving out an item, which changes the total weight.
About the Weighted Grade Calculator
The Weighted Grade Calculator combines several scores into one final grade, with each item counting in proportion to its weight. Enter your grades and weights, one per line, and it returns the weighted percentage and a letter grade.
Who should use this tool
Students and teachers tracking course grades made up of weighted assignments and exams.
Benefits
- Weighted final grade from any number of items.
- Works even when weights do not total 100.
- Shows a letter grade alongside the percentage.
- Private — calculated entirely in your browser.
Practical use cases
- Combining homework, quizzes and exams into a course grade.
- Checking your current grade partway through a term.
- Seeing how much an upcoming exam will move your grade.
Frequently asked questions
Do the weights have to add up to 100?
No. The calculator divides by the total weight you enter, so partial sets and weights that total more or less than 100 both work.
How do I include a category name?
Put the name before a colon, for example "Midterm: 90, 40". The name is optional and only used for display.
What letter grade does it use?
A standard scale: 90+ is A, 80+ B, 70+ C, 60+ D, below 60 F.