Why you can't average the percentages
If a quiz is worth 20 points and a test 180, averaging their percentages treats them as equal — but the test is nine times as important. Points-based courses already encode the weights in the point values, so the only correct method is total earned ÷ total possible.
Using the remaining-points view
The best/worst finish range turns the gradebook into a planning tool: if your best possible finish is 88%, chasing an A is off the table and the realistic goal is protecting the B+. If your worst possible finish still clears the bar you care about, the course is safe and your effort belongs elsewhere.
FAQ
How do I convert points to a percentage?
Divide points earned by points possible and multiply by 100. For example, 43 out of 50 is 43 ÷ 50 × 100 = 86%.
What letter grade is my percentage?
On the standard US scale: 90–100 A, 80–89 B, 70–79 C, 60–69 D, below 60 F, with plus/minus subdivisions at most schools. Your school's handbook has the authoritative cutoffs.
My teacher drops the lowest quiz — how do I account for it?
Subtract both the earned and possible points of the dropped quiz from the totals before dividing.
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