How weighted grades work
Not all assignments count equally. A final exam might be worth 40% of your grade while a quiz counts for just 5%. A weighted grade accounts for this by multiplying each score by its weight before averaging.
The formula
Weighted average = Σ (grade × weight) ÷ Σ weights
For example: Quiz 1 = 90% (weight 10), Quiz 2 = 85% (weight 10), Midterm = 78% (weight 30), Paper = 92% (weight 20). Weighted average = (90×10 + 85×10 + 78×30 + 92×20) ÷ 70 = 84.3%.
Letter grade scale
This calculator shows the standard US letter grade: A (90–100), B (80–89), C (70–79), D (60–69), F (below 60). Some schools use +/− modifiers — check your syllabus.
Plan for the final
After entering your current grades, check the final grade calculator to find exactly what score you need on the final exam to reach your target grade.
Frequently asked questions
- How is a weighted grade calculated?
- Multiply each grade by its weight, sum them, and divide by total weight.
- What if my weights don't add to 100?
- This calculator handles any weights — it normalises automatically.
- How do I know what I need on the final?
- Use the final grade calculator — enter your target and it tells you the required score.
- Is this calculator free?
- Yes, free, no sign-up, runs entirely in your browser.