Weighted Grade Calculator
Combine scores from up to five weighted components (exams, assignments, participation) into one overall percentage grade.
The formula
Overall grade = (Σ weight × score) ÷ (Σ weight) — each component's score is scaled by its weight, summed, then divided by the total weight. If your weights already add up to 100%, this simplifies to just summing each (weight% × score%) ÷ 100.
Worked example
Exams worth 50% (score 80%), assignments worth 30% (score 90%), and participation worth 20% (score 95%): overall = (50×80 + 30×90 + 20×95) ÷ 100 = (4000 + 2700 + 1900) ÷ 100 = 86%.
Why this differs from a simple average
A simple average of 80%, 90%, and 95% would be 88.3% — different from the correct weighted result of 86%, because a plain average treats every component as equally important. Weighting is essential whenever course components don't count equally toward the final grade.
Frequently asked questions
What if I only have 3 components, not 5?
Leave the unused components' weight at 0 (or blank) — they're automatically excluded from the calculation and won't affect your result.
Do my weights need to add up to exactly 100%?
No — the formula divides by the total weight you actually entered, so it stays mathematically correct even if your weights sum to something other than 100. The calculator will flag it as a note so you can double-check your numbers if 100% was intended.