Points-Based Grade Calculator

Does your gradebook show a running total like 412 / 460 and no category percentages? Then your teacher grades on total points, and this is the calculator you want. List what you earned and what each thing was worth, and it gives you the percentage and letter grade.

Filling it in

One row per graded item. Homework, quizzes, the project, the midterm, whatever's been scored. Put earned points on the left and possible points on the right. Leave off anything that hasn't been graded.

Here's a mid-semester example:

412 ÷ 460 = 89.57%. That's sitting right on the A-/B+ line, which is a very good reason to ask your teacher how they round.

Why the math is so simple

Grade % = total earned ÷ total possible × 100

No weights. The midterm is worth 180 points and a quiz is worth 20, so the midterm automatically counts nine times as much. Size is the weighting.

That's also why the same scores can give a different grade under a weighted system. If your syllabus lists percentages for categories, use the grade percentage calculator instead. Our post on how weighted grades work shows the two methods side by side if you want to see the gap.

Mistakes worth avoiding

Leaving missing work out. It feels harmless, but your gradebook counts it as zero, so you should too. A missing 20-point quiz goes in as 0 / 20.

Averaging percentages. A 90% quiz and an 80% test don't average to 85% unless they were worth the same points. In a points class they almost never are.

Extra credit in the wrong column. It goes in "earned" only. Put it in "possible" too and most of the benefit disappears.

Ignoring the big stuff. Losing 30 points on a 200-point exam hurts more than skipping three 10-point worksheets. Spend effort where the points are.

Planning ahead

Say there are 100 points left this term and you want to finish at 90%. The course will total 460 + 100 = 560 points, and 90% of 560 is 504. You have 412, so you need 92 of the remaining 100. The what-if grade calculator runs that kind of target math without the scratch paper.

One last habit: copy scores straight from the online gradebook. From memory, everyone's quiz scores somehow come out a point or two higher.

How much is each item really worth?

A handy way to think about it: divide an item's points by the total course points. In the example above, the 180-point midterm is 180 ÷ 460, about 39% of everything graded so far. Each 20-point quiz is about 4%.

That's why a bad quiz feels worse than it is, and a bad midterm feels about right. Once the final is added (say another 200 points), the midterm's share drops to roughly 27%, because the pool got bigger.

Teachers, if you grade on points, it's worth telling students the expected course total on day one. It saves a lot of confused emails in week ten.