How to Calculate a Weighted Grade (Formula + Example)
By GradeWeight · Updated October 14, 2026
Most courses do not treat every assignment equally. Homework might be worth 20% of your grade, quizzes 30%, and the final exam 50%. To find your real grade, you need a weighted grade calculation — not a simple average.
Multiply each grade by its weight, add the results, and divide by the total weight:
Weighted Grade = Σ (Grade × Weight) ÷ Σ Weights
If your weights add up to 100%, you can skip the division step — the sum of the products is your grade.
Step-by-Step Example
Say your course breaks down like this:
Category
Your Grade
Weight
Grade × Weight
Homework
90
20%
90 × 0.20 = 18
Quizzes
85
30%
85 × 0.30 = 25.5
Final Exam
80
50%
80 × 0.50 = 40
Total
100%
18 + 25.5 + 40 = 83.5
Your weighted grade is 83.5%. A simple average of 90, 85, and 80 would have given 85 — close, but wrong, because it ignores that the final exam counts more than homework.
What If Your Weights Don't Add Up to 100%?
That is normal when some work is not graded yet. For example, if only homework (20%) and quizzes (30%) are done, your completed weight is 50%. Divide the sum of the products by 0.50 to get your current grade on completed work.
What Score Do You Need on the Final Exam?
Work backwards: subtract your current weighted points from your target grade, then divide by the final exam's weight. Or skip the math — use our free calculator below.
A worked weighted-grade example — every category multiplied by its weight, then added up.
Frequently Asked Questions
What is a weighted grade? A grade where each assignment category counts according to its weight (percentage) in the course, rather than equally.
How do I calculate my grade if weights don't total 100%? Divide the sum of (grade × weight) by the total weight completed so far, as a decimal.
Can I calculate what I need on my final? Yes — use the Final Exam Calculator on our homepage to find the exact score you need for your target grade.
Do all teachers use weighted grades? Not all — some courses use total points instead. But total-points grading is just weighting in disguise: a 200-point final counts twice as much as a 100-point test. The same math applies.
