Grade Calculator
Calculate your weighted final grade from individual assignment scores.
The Formula
Weighted average:
Final = Σ(Score × Weight) / Σ(Weights)
= (82×0.5) + (95×0.3) + (88×0.2)
= 41 + 28.5 + 17.6
= 87.1% — B+
How Weighted Grades Work
Most courses divide your grade into categories with different weights — exams might count for 40% of your grade, homework 30%, quizzes 20%, and participation 10%. Each category's weight represents how much it contributes to your final grade. To calculate your weighted grade: multiply your score in each category by its weight (as a decimal), then sum all the results. If you scored 85% on exams (weight 0.40), 92% on homework (0.30), 78% on quizzes (0.20), and 95% on participation (0.10), your final grade is: (85 x 0.40) + (92 x 0.30) + (78 x 0.20) + (95 x 0.10) = 34 + 27.6 + 15.6 + 9.5 = 86.7%.
What Score Do You Need on the Final?
One of the most useful functions of a grade calculator is figuring out what score you need on an upcoming final exam to achieve your target course grade. The formula: needed final score = (Target grade - Current weighted grade x Current weight percentage) / Final exam weight. For example, if you currently have 80% and that represents 80% of the course grade, and you want a 90% course grade with the final worth 20%: (90 - 80 x 0.80) / 0.20 = (90 - 64) / 0.20 = 26 / 0.20 = 130%. If the answer exceeds 100%, a 90% course grade is mathematically out of reach.
Letter Grade Cutoffs
Standard letter grade thresholds: A = 90–100%, B = 80–89%, C = 70–79%, D = 60–69%, F = below 60%. Some instructors use a more granular scale with plus and minus grades (A- starts at 90%, A is 93–96%, A+ is 97–100%). Always check your specific syllabus for the grade cutoffs your instructor uses — they vary more than most students expect.
Frequently Asked Questions
What score do I need on my final exam to pass?
Use the formula: Needed score = (Target grade - Current grade x Current weight) / Final exam weight. For example, to get a 70% course grade when you currently have 65% at 75% of the course weight, with the final worth 25%: (70 - 65 x 0.75) / 0.25 = (70 - 48.75) / 0.25 = 21.25 / 0.25 = 85%. You would need an 85% on the final to achieve a 70% course grade.
How do I calculate my grade if I don't know my exact score in a category?
Use your average score for completed assignments in that category as your current estimate, then add the remaining assignments at 0% to see the worst case, or at 100% to see the best case. This gives you a range. Many students find it useful to know both their current grade and their minimum possible final grade assuming they score 0% on everything remaining.
What is the difference between average and weighted average?
A simple average treats all items equally. A weighted average gives different items different levels of importance. In a course where exams count 60% and homework counts 40%, your exam scores are 1.5 times more impactful than homework scores. If you average 90% on exams but only 70% on homework, your weighted grade is (90 x 0.60) + (70 x 0.40) = 54 + 28 = 82%, not the simple average of 80%.
Can I recover my grade if I failed an early exam?
It depends on how much of the grade remains. If you have completed 30% of the course weight and failed (say 55%), you need to average (Target grade - 55 x 0.30) / 0.70 on the remaining work. For a 75% target: (75 - 16.5) / 0.70 = 83.6% average on everything remaining. Difficult but achievable. The earlier the failure, the more recovery is mathematically possible.
What is an incomplete grade?
An Incomplete (I) is a temporary grade given when a student cannot finish a course due to circumstances beyond their control — illness, family emergency, or similar. The student typically has a set period (one semester to one year) to complete the remaining work before the I converts to an F or the grade earned from completed work. Incompletes appear on transcripts and can affect GPA and financial aid eligibility if not resolved promptly.