Grades are rarely averaged fairly — they are averaged by weight
A plain average treats every score as equal, but almost no syllabus does. Homework might count 10 percent, quizzes 20, a midterm 30 and the final 40 — which means a point on the final is worth four homework points, and effort allocated evenly is effort allocated badly. A weighted grade fixes the arithmetic: each category contributes its grade multiplied by its weight, and the contributions add up to your overall. This calculator handles up to six categories at once, ignores rows you leave at zero weight, shows exactly how many points each category contributed, and warns you when your weights do not add up to 100 — the most common sign of a mistyped syllabus. If instead you know your current grade and want the score a remaining exam requires, the companion tools are the Grade Calculator and the Final Grade Calculator.
The weighted grade formula
Each term is one category: a 90% at 40% weight contributes 90 × 0.40 = 36 points, and an 80% at 60% weight contributes 48 points, for an overall of 84.0% — the defaults on this page. Dividing by the sum of the weights rather than assuming 100 is what makes the calculator safe to use mid-course: enter only the categories graded so far and it reports the weighted average of what exists, rather than pretending the missing categories scored zero. The letter grade then reads off the standard ten-point scale: A at 90 and above, B at 80, C at 70, D at 60, F below 60.
When the weights do not add to 100
There are three honest reasons, and they need different responses. Mid-course: only some categories have run yet, so the weights of what exists sum to less than 100 — the overall here is your standing so far, not a prediction, and it will move as heavy categories land. A mistyped syllabus: a category was dropped, double-counted or read from the wrong row; if the weights were meant to cover the whole course and do not sum to 100, fix the inputs before trusting the output, because the calculator cannot know which weight is wrong. Extra credit and renormalisation: some instructors deliberately let weights exceed 100 or rescale at the end; in that case the divide-by-total-weight behaviour here mirrors the usual renormalisation, but your instructor's stated policy is the authority. The note under the calculator flags the mismatch whenever it appears, so it never passes silently.
Using the contribution column to plan
The most useful view on this page is not the overall — it is the contribution column, which shows the points each category has already banked or can still supply. A category worth 40 percent where you are running 75 has 30 points banked and 10 still winnable; that is where study time earns its highest return per hour, even if a smaller category feels more urgent because a deadline is nearer. Run the numbers twice — once with your current category grades, once with realistic improved ones — and the gap between the two overalls tells you what the improvement is actually worth in the only currency the transcript accepts. Students are routinely surprised in both directions: a beloved homework streak worth 10 percent cannot rescue a neglected 40-percent final, and a mediocre start in a light category is far less fatal than it felt.
Worked example
Homework-style category at 90% with a 40% weight contributes 90 × 0.40 = 36.0 points. A tests category at 80% with a 60% weight contributes 80 × 0.60 = 48.0 points. Overall = (36.0 + 48.0) ÷ 100% of weight = 84.0%, which is a B on the ten-point scale. The four remaining rows sit at weight 0, so they are ignored completely — exactly as an unused syllabus category should be.
How to use this calculator
- Find the grading breakdown in your syllabus: each category's name and weight.
- Enter each category's current grade as a percentage in a grade row, and its syllabus weight in the weight row beneath it.
- Leave unused rows at grade 0 and weight 0 — rows with zero weight are ignored.
- Read your weighted overall and letter grade in the headline panel.
- Check the note: if your weights were meant to cover the whole course and do not sum to 100, a category is missing or mistyped.
Category grades are averages too
Each figure you enter is itself usually an average — of homework assignments, of quizzes — and instructors compute those inner averages in different ways: some drop the lowest score, some weight later work more heavily, some average by points rather than by assignment. If this calculator's overall disagrees with your course portal by a point or two, an inner-average rule is the usual cause, and the portal is authoritative for your official standing. Where the disagreement is large, the likely culprits are a dropped score you have forgotten, a category weight misread from the syllabus, or an assignment recorded as a zero that you believed was excused — all worth one polite check of the grade book.
Finally, treat the weighted overall as a planning instrument, not a verdict delivered early. Until the heaviest categories are graded, the number is provisional by construction — the same 84 that is safe with only light categories outstanding is fragile with a 40-percent final still to sit. Pair this page with the Grade Calculator once you know what remains: one tool reports where you stand, the other prices what standing still will cost.