How the weighted grade works
A weighted grade reflects that not every assignment counts the same toward a final mark. Each item has a score (a percentage) and a weight (how much it matters). The calculator multiplies every score by its weight, sums those products, and divides by the total weight to get the final percentage.
Dividing by the total weight rather than by 100 means the result is always normalised to whatever weights you enter. If your weights happen to add to 100, the division is by 100 and nothing changes; if they add to something else, the tool still produces a fair weighted average across the items you provided and flags the mismatch in a note.
Reading the contribution chart
The bar chart breaks the final grade into the percentage points each item adds. An item’s contribution is its score times its share of the total weight, so the bars sum to the final grade. This makes it obvious which items are pulling the grade up and which are holding it back, and where extra effort would move the needle most.
The final percentage is also converted to a letter using the common scale: A from 90, B from 80, C from 70, D from 60, and F below that.
Tips and common mistakes
To get an accurate and useful result:
- Enter weights consistently — all as percentages, or all as raw point values; mixing the two distorts the average.
- Leave unused item slots at zero weight; they are skipped rather than counted as zero scores.
- To find the score you need on a remaining item, enter your known results and adjust the last item until the final grade hits your target.
- Letter-grade cutoffs differ by school and course; treat the letter here as the standard convention, not your instructor’s exact policy.
Formula
final = Σ(score · weight) / Σ(weight)Frequently asked questions
- Do my weights need to add up to 100?
- No. The grade is normalised by the total weight you enter, but a note flags it when the weights do not sum to 100%.