Grade Calculator
Combine weighted marks — or find the score you need on the final.
How the calculator works
Weighted grading multiplies each item's score by its weight and divides the sum by the total weight used, so results stay correct even when you have only completed part of the course — an 88% midterm worth 30% contributes 26.4 points, not 88. The final-exam mode solves the equation target = current × (1 − w) + exam × w for the exam score, where w is the final's weight. If the required score is negative, any exam result — even zero — keeps you above target; if it exceeds 100, no legal score reaches the target and the result says so instead of showing an impossible number.
Formula
Needed = (Target − Current × (1 − w)) ÷ w
Where:
- score / weight — each item's percentage and its share of the grade
- Current — your grade before the final exam
- w — the final exam's weight as a decimal (40% = 0.40)
- Target — the course grade you want to end with
Example
Suppose you have scored 82% on homework worth 20%, 78% on labs worth 20%, and 74% on the midterm worth 30%. The weighted average is (16.4 + 15.6 + 22.2) ÷ 0.70 = 77.4% so far. With a final worth the remaining 30% and a target of 80%, you need (80 − 77.4 × 0.70) ÷ 0.30 ≈ 86% on the exam — demanding but achievable, and knowing the exact number beats guessing.