Grade Calculator

Most courses don't grade everything the same way — a final exam usually counts for more than a single homework assignment. This calculator handles that by letting you enter each grading category separately, along with how much it's worth, and combining them into one overall grade.

The math is a weighted average: multiply each category's score by its weight, add those up, and divide by the total weight. Entering Homework at 20% with a 90% score and a Final Exam at 80% with a 75% score, for example, weighs the exam four times as heavily as the homework in your final number — which matches how your instructor is actually grading you.

You don't need your weights to add up to exactly 100% to get a useful number. If you've only got grades back for some categories so far, enter just those — the calculator normalizes by whatever total weight you've entered, and shows that total so you can see how much of your final grade it actually represents.

A worked example

Say your syllabus splits grading into Homework (20%, currently at 90%), Quizzes (30%, currently at 82%), and a Final Exam (50%, currently at 75%). Multiply each score by its weight: 90 × 20 = 1,800, 82 × 30 = 2,460, and 75 × 50 = 3,750, for a total of 8,010. Divide by the total weight (20 + 30 + 50 = 100): 8,010 ÷ 100 = 80.1% — which lands in the B range (80–89.9%) on this calculator's standard letter-grade scale.

A common misconception

It's easy to assume a simple average of your category scores tells you your grade, but a plain average treats a 5%-weighted homework category the same as a 40%-weighted final exam — which isn't how weighted grading actually works. In the worked example above, a plain average of 90, 82, and 75 would give 82.3%, noticeably higher than the correct 80.1% weighted result, because it ignores that the lowest score (the final) carries the most weight. Always use the weighted formula when your syllabus assigns different weights to different categories.

Special cases this calculator doesn't model

Many syllabi include policies this calculator doesn't apply automatically: dropping your lowest quiz or homework score, offering extra credit that pushes a category above 100%, or curving a category's scores after the fact. If your course drops a low score, leave that specific assignment out of your average for that category before entering it here; if a category includes extra credit, enter the resulting score even if it's above 100 — the calculator accepts any score up to 100, so extra credit needs to be folded into that number first. Letter-grade cutoffs are another common variation: some instructors set the A cutoff at 93 rather than 90, or add +/- letter grades, so check your syllabus rather than assuming this calculator's 90/80/70/60 scale is your instructor's exact scale.

How to use your result

Use this calculator as a running checkpoint throughout the term, not just a final tally — entering only the categories you have grades for shows you exactly how much of your final grade is still undecided. It's also useful for “what-if” planning: if you know your current categories and their weights, you can test different scores for a category you haven't completed yet (like an upcoming final) to see what you'd need to reach a target overall grade.

Course grade vs. GPA

This tool and GPA Calculator solve related but distinct problems. This one averages weighted categories within a single course to estimate that course's overall percentage and letter grade. GPA Calculator takes finished letter grades from multiple courses and averages them, weighted by credit hours, into one cumulative number. In practice they chain together: this calculator's letter grade for one course becomes a single input row in a GPA calculation once the term is over.