Grade Calculator

Final course grade calculation determines your overall grade in a class where different assessments (exams, homework, projects, participation) carry different weights. This is a weighted average — not a simple average — because each category contributes a specified percentage of the total grade.

Weighted average formula: Final Grade = Σ (Category Weight × Category Score) ÷ Σ Weights

When weights sum to 100%: Final Grade = (W₁ × S₁) + (W₂ × S₂) + (W₃ × S₃) + …

Where:

• Wᵢ — the weight of each category (expressed as a decimal: 30% = 0.30)
• Sᵢ — your score in that category (as a percentage)
• All weights must sum to 1.0 (100%)

Letter grade scale (standard US):

• A / A+: 93–100% / 97–100%
• A−: 90–92%
• B+: 87–89% | B: 83–86% | B−: 80–82%
• C+: 77–79% | C: 73–76% | C−: 70–72%
• D+: 67–69% | D: 63–66% | D−: 60–62%
• F: below 60%

GPA conversion (4.0 scale):

• A = 4.0 | A− = 3.7
• B+ = 3.3 | B = 3.0 | B− = 2.7
• C+ = 2.3 | C = 2.0 | C− = 1.7
• D+ = 1.3 | D = 1.0 | F = 0.0

What score do I need on the final exam? Required Score = (Target Grade − (Current Weighted Total × (1 − Final Exam Weight))) ÷ Final Exam Weight

Worked example: Course weights: Homework 20%, Midterm 30%, Final 40%, Participation 10%.

Your scores: Homework 88%, Midterm 74%, Participation 95%. You need 80% (B) overall.

• Current weighted total (without final): (0.20 × 88) + (0.30 × 74) + (0.10 × 95) = 17.6 + 22.2 + 9.5 = 49.3 points out of 60%
• Required final exam score: (80 − 49.3) ÷ 0.40 = 30.7 ÷ 0.40 = 76.75%

You need at least 77% on the final to earn a B in the course.