How do you calculate your grade when the lowest score is dropped?
Remove the lowest score in the drop-eligible category, then average the rest. Quiz scores of 72, 88, 91, 65, 84 with one drop: drop the 65, average the remaining four: (72 + 88 + 91 + 84) ÷ 4 = 83.75%.
Worked example: 5 quizzes, lowest dropped
| Step | Scores | Result |
|---|---|---|
| All five quizzes | 72, 88, 91, 65, 84 | Average 80.0% |
| Drop the 65 | 72, 88, 91, 84 | Average 83.75% |
| Gain from the drop | +3.75 points | Worth most when the low score is an outlier |
How to read this table
- All five quizzes sits at the top of the table (72, 88, 91, 65, 84) — average 80.0%. If your situation looks like this row, plan against the upper half of the range rather than the midpoint.
- Gain from the drop anchors the bottom (+3.75 points) — worth most when the low score is an outlier. Treat this as the conservative case you should still be profitable at.
- The gap between the top and bottom row is roughly 22×. That spread is why a single blended average is close to useless here — pick the row that matches your setup instead of averaging the column.
Context
Drops help most when one score is far below the rest — a single 65 among 80s costs 3.75 points, while a consistent five-point spread costs almost nothing. Watch for the fine print: many syllabi drop the lowest only within a category, some drop the lowest *after* weighting, and some exclude the final from eligibility. In points-based courses, dropping means removing both the earned and possible points before dividing.
What moves this number
Syllabus weighting scheme
The same scores produce different grades under category weights, points-based grading, and drop-lowest policies. The syllabus — not the raw scores — determines which formula applies.
Plus/minus and cutoff policy
Schools set their own letter-grade cutoffs (90 vs 93 for an A) and whether plus/minus exists. A 2-point cutoff difference moves a borderline grade by a full letter.
Credit-hour weighting
GPA is credit-weighted, so a 4-credit course moves the average twice as much as a 2-credit course with the same grade.
Methodology
Drop-lowest: remove min(scores) from the eligible set, then apply the normal mean or points formula to the remainder. Eligibility rules are syllabus-specific.
Assumptions and caveats
- Grading policies (weights, drops, curves, cutoffs) are set by each school — verify against the syllabus before acting on a computed grade.
- Letter-grade and GPA scales shown are the common US conventions, not a universal standard.
- This page was last reviewed on 2026-10-01. Ranges are updated as new data lands, so re-check before using them in a contract or a plan.
- Use these numbers as a starting range, not a guarantee — your own historical data always beats a benchmark.
Frequently asked questions
How do you calculate your grade when the lowest score is dropped?
Remove the lowest score in the drop-eligible category, then average the rest. Quiz scores of 72, 88, 91, 65, 84 with one drop: drop the 65, average the remaining four: (72 + 88 + 91 + 84) ÷ 4 = 83.75%.
Which option pays the most in the worked example: 5 quizzes, lowest dropped table?
All five quizzes, at 72, 88, 91, 65, 84 (Average 80.0%). That row represents the strongest case in this dataset, so use it as an upper bound rather than an expectation.
What is a realistic low-end figure?
Gain from the drop at +3.75 points (Worth most when the low score is an outlier). Plan your costs so the low end still works, then treat anything above it as upside.
Why do the numbers vary so much?
The spread between the highest and lowest row is about 22×. Syllabus weighting scheme and plus/minus and cutoff policy explain most of that gap — see the drivers section above for the full list.
Where do these numbers come from?
Drop-lowest: remove min(scores) from the eligible set, then apply the normal mean or points formula to the remainder. Eligibility rules are syllabus-specific.
How can I estimate my own number instead of using a benchmark?
Use the Quiz Average Grade Calculator on RevenueLab — it takes your own inputs and returns a figure specific to your setup, which is always more accurate than a published range.
Model your own numbers
- Quiz Average Grade Calculator
- Weighted Grade Calculator
- Final Grade Calculator
- Semester Grade Calculator
Related reading
More answers in this category
- How do you calculate a weighted grade when you have missing assignments?
- How do you calculate a weighted grade?
- How do you calculate what grade you need on the final exam?
- How do you calculate your grade from percentages?
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Last updated 2026-10-01.