The weighted grade formula
Grade = (score₁ × weight₁ + score₂ × weight₂ + …) ÷ (weight₁ + weight₂ + …)
Weights reflect how much each piece of work counts. Enter scores as percentages and weights in any consistent unit — percent of the course, points, or credits.
Worked example
Homework 85% worth 20, and a midterm 72% worth 30: (85 × 20 + 72 × 30) ÷ 50 = 3,860 ÷ 50 = 77.2%. If the final exam is worth the remaining 50 and you want 80% overall, you need (80 × 100 − 3,860) ÷ 50 = 82.8% on the final.