Weighted Grade Calculator
Weighted Average
90.00%
Total Weight
100%
How it works
A weighted grade calculator computes the final grade for a course where different assessments contribute different percentages to the overall mark. Most university and secondary-school courses use weighted grading: midterm exams might count for 25%, homework for 20%, a final exam for 40%, and participation for 15%. Simply averaging the raw scores would be incorrect — the Weighted Grade Calculator correctly applies each weight.
**Formula** Final grade = Σ (score_i × weight_i) / Σ weight_i (when weights are percentages that may not sum to exactly 100%) or simply Σ (score_i × weight_i) when weights are declared as exact percentages summing to 100%.
**Example calculation** Homework: 88% × 20% = 17.6 pts. Quiz average: 75% × 15% = 11.25 pts. Midterm: 82% × 25% = 20.5 pts. Final exam: 79% × 40% = 31.6 pts. Total: 17.6 + 11.25 + 20.5 + 31.6 = 80.95%. If weights don't sum to 100% (some assignments not yet graded), the calculator computes the current grade and projects the minimum score needed on remaining work to achieve a target final grade.
**"What do I need to get on the final?"** The tool solves for the required final exam score to achieve a target grade: Required = (Target − Current_weighted_sum) / Final_exam_weight. Example: you have 78% so far on 60% of the grade and want an 80% final: required final score = (80 − 46.8) / 40% = 83.0%.
**Grade scale conversion** The calculator converts percentage grades to letter grades and GPA points using the standard scale (A+ = 97–100, A = 93–96, A− = 90–92, B+ = 87–89, etc.) and also supports custom grade scales for instructors who use non-standard cutoffs.
Privacy: all calculations run in the browser. No grade data is transmitted.
Frequently Asked Questions
- Simple averaging treats all assignments as equal weight, which is almost never the case. A 10-point homework assignment and a 100-point final exam contribute equally in a simple average, but your syllabus probably says the final exam counts for 40% and homework 10%. Weighted averaging multiplies each score by its percentage contribution before summing, which correctly reflects the course grade structure. A simple average significantly overstates homework importance and understates exams.
- Use the formula: Required = (Target_grade − Σ(score_i × weight_i)) / final_exam_weight. Example: you need 70% to pass, you currently have 68% on 60% of the grade completed, and the final is worth 40%. Required = (70 − 68×0.6) / 0.4 = (70 − 40.8) / 0.4 = 29.2 / 0.4 = 73%. The Weighted Grade Calculator computes this automatically — enter your current scores and weights, set your target, and it shows the minimum score needed on any remaining assessment.
- Many courses drop the lowest quiz score or homework grade. To handle dropped grades: first identify which score would be dropped (the lowest one in that category), remove it, then recalculate the category average without it. The calculator supports a 'drop lowest N scores' option within any grade category — specify the number to drop, and it automatically excludes the N lowest scores before computing the category average.
- Using the standard 4.0 scale: 90–100% = A (4.0), 80–89% = B (3.0), 70–79% = C (2.0), 60–69% = D (1.0), <60% = F (0.0). With +/− grades: 82% = B− in most systems (3.0 or 2.7 depending on whether your school uses B−). An 83–86% is typically a B (3.0); 87–89% is B+ (3.3); 80–82% is B− (2.7). Your institution's specific grade scale takes precedence — some use 85–89 = B+, others 87–89. The calculator includes all common scales and lets you enter a custom one.