Weighted Grade Calculator
Add each assignment’s score and weight to calculate your final weighted grade.
Final Weighted Grade
85.4%
How to use this calculator
The calculator opens with the three components from the worked example below. Replace them with your own: for each assignment, enter the score you received and the weight it carries toward your final grade. Add or remove rows as needed — the Final Weighted Grade updates automatically.
Why a simple average is wrong for course grades
A plain average treats every score as equal, whatever the syllabus says it is worth. Take homework 95% (weight 15), quizzes 90% (10), midterm 70% (35) and final 60% (40). The plain average of the four scores is 78.75%. Weighted, it is (95 × 15 + 90 × 10 + 70 × 35 + 60 × 40) ÷ 100 = 71.75%, because the two weakest scores carry three quarters of the weight.
How the weighted grade is calculated
Final Grade = Σ(Score × Weight) ÷ Σ(Weight) — each score is multiplied by its weight, those products are summed, and the total is divided by the sum of all weights. This normalizes automatically, so the result stays mathematically correct even if your entered weights don't add up to exactly 100%.
Worked example
Homework at 85% (weight 20), a midterm at 78% (weight 30), and a final exam at 90% (weight 50) give a weighted sum of (85×20) + (78×30) + (90×50) = 8,540 over 100 total weight, for a final grade of 85.4% — noticeably closer to the final exam score than a simple average of the three (84.3%) would suggest, because the final exam carries the most weight.
Frequently Asked Questions
What if my weights don't add up to exactly 100%?
The calculator normalizes automatically by dividing the weighted sum by the total weight entered, so the final grade is still mathematically correct even if your weights sum to something other than 100 — useful if you're only entering the assignments graded so far, with the rest still to come.
Can I use this to predict what I need on a final exam to get a target grade?
Not directly, but you can work backward: enter your known scores and weights, leave the final exam's score blank until you find the right value by trial, or solve it algebraically — target grade minus your weighted score-so-far, divided by the final's weight, gives the score you need on the final.
Does entering 0 for a missing assignment lower my grade correctly?
Yes — if an assignment is graded and counts toward your final grade, enter its actual score (including 0 for a missed assignment) rather than leaving it blank. Leaving a row blank excludes it entirely from the calculation instead of counting it as a zero, which would understate how much it's actually hurting your grade.
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