Weighted Grade Calculator
How the math works
Every category on your syllabus is a slice of the course. A category worth W percent with a grade of G contributes W × G ÷ 100 points. Add the contributions and, when the weights cover the whole course, the sum is your grade:
course grade = Σ(weight × grade) ÷ 100, when weights total 100
With the starting example — homework 20% at 92, quizzes 20% at 85, exams 40% at 78, participation 20% at 95 — the contributions are 18.4 + 17 + 31.2 + 19 = 85.6. Notice how the exam category, at double the weight, drags a strong gradebook down more than any other row lifts it. That is what "weighted" means in practice.
When your entered weights total less than 100 — say the final exam has not happened yet — there are two honest numbers, and this calculator shows both: the average of what you have entered so far, and the floor your grade would hit if the missing share scored zero. What it will not do is silently pretend the entered categories are the whole course.
Questions
How does the calculator combine my categories?
Each category contributes weight times grade divided by 100 points. With Exams at 40% weight and a 78 average, exams contribute 40 x 78 / 100 = 31.2 points to the course grade. When the weights total 100, the sum of those contributions is your course grade.
What happens if my weights do not add up to 100?
The calculator says so instead of hiding it. Below 100, it shows the average of the categories you entered (points divided by total weight) and, separately, the worst case: the course grade if the missing share scored 0. Above 100, it flags the total as a likely typo and still shows the average of what you entered.
Can a category have a weight of 0?
Yes. A zero-weight category contributes nothing to the points and nothing to the weight total, so it never changes the result. Rows with both boxes empty are skipped entirely; a row with only one box filled blocks the result until you complete or clear it.
Does the calculator round my grades?
Only the displayed results are rounded, to one decimal. The math runs on exactly what you type. Grades above 100 are accepted up to 150, because extra credit inside a category is real.
Where do the weights come from?
Your syllabus. The starting rows here (homework 20, quizzes 20, exams 40, participation 20) are just a common example layout. Edit every name, weight, and grade to match the actual course - the syllabus always wins.