Grade Calculator — Final Course Grade with Weighted Assignments

Simple (equal-weight) grade: add all scores and divide by number of assessments. Weighted grade: multiply each component's score by its weight, sum the products. Example: homework 85% at 30% weight + midterm 78% at 35% weight + project 91% at 35% weight = (0.30×85) + (0.35×78) + (0.35×91) = 25.5 + 27.3 + 31.85 = 84.65% final grade.

Passing grade is typically defined in the course syllabus — commonly D (60%) is passing at many universities, C (70%) is required in some majors or for prerequisite courses, and B (80%) may be required for graduate school courses. Check your institution's academic policies. For graduate school applications, anything below B– (80%) can be problematic, and some programs consider below B (83%) as effectively failing for their purposes.

Impact = component weight × (new score – current average). A 20%-weight assignment where you score 60% instead of expected 80% costs: 0.20 × (60 – 80) = –4 percentage points from your final grade. The same 20-point difference on a 5%-weight assignment costs only 1 percentage point. High-weight components (finals, major projects) have disproportionate grade impact — prioritize accordingly.

Depends on the amount and timing. Extra credit typically adds 1–5 percentage points to a final grade — useful for moving from 88 to 90 (A- to A) or 78 to 80 (borderline). It rarely compensates for systematic underperformance across multiple high-weight components. The most reliable grade improvement strategy is performing well on high-weight assessments, not relying on extra credit.

Standard 4.0 scale: A+ = 4.0, 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, D– = 0.7, F = 0.0. Percentage ranges vary by institution but commonly: A = 93–100%, A– = 90–92%, B+ = 87–89%, B = 83–86%, B– = 80–82%, C+ = 77–79%, C = 73–76%, C– = 70–72%, D = 60–69%, F = below 60%.

Curving adjusts individual or all grades upward (sometimes downward) to achieve a desired class grade distribution. Common methods: (1) Add a flat number of points to all scores; (2) Scale the highest score to 100% and adjust all others proportionally; (3) Set the class average to a target (e.g., B = 83%); (4) Drop lowest scores. Not all classes curve — it depends entirely on the instructor. Curves are most common in introductory STEM courses where assessments are intentionally difficult.