Weighted Grades, Explained
Most courses weight their components — homework 20 %, midterm 30 %, final 50 % and so on. Your course grade is the weighted average of your scores:
Grade = Σ(score × weight) ÷ Σ(weights)
Worked Example
Homework 92 % (weight 20), midterm 78 % (weight 30): current grade = (92×20 + 78×30) ÷ 50 = 83.6 % with half the course graded.
"What Do I Need on the Final?"
The second half of the tool answers the classic end-of-semester question. If your target is grade T, the final is worth w (as a fraction) and your current average is C:
Needed = (T − C × (1 − w)) ÷ w
Continuing the example: to finish at 85 % when the final counts 50 %, you need (85 − 83.6×0.5) ÷ 0.5 = 86.4 % on the final. If the answer exceeds 100 %, the target is out of reach without extra credit; if it's negative, you've already secured it.
Strategy Tips
- Calculate early — knowing you need 62 % on the final changes how you allocate study time.
- Weights matter more than counts: one 40 %-final outweighs ten 2 %-quizzes.
- Enter scores as percentages even if graded in points: points earned ÷ points possible × 100.