Grade Calculator
This grade calculator works out your overall class grade from each assignment or category. Type a score, how much it's worth, and you'll get the weighted percent and the letter grade. Enter scores as a percent, or as points earned out of points possible, and the tool converts them. Leave the weights blank and it'll take a simple average instead. It's free, private, and updates as you type.
- Weighted class grade
- Percent or points
- Letter grade
- Any number of rows
- Simple average too
Last updated June 17, 2026 Common US letter scale Reviewed by the Calcowa team
Each row is an assignment or a category. Leave Out of blank to type a percent directly. Blank weights give a simple average.
(90×40 + 80×60) ÷ 100 = 84.0%
How do I calculate my class grade?
A class grade is a weighted average, not a plain one, because the parts of a course rarely count equally. You multiply each score by its weight, add those products, and divide by the total weight. So a 90 percent that's worth 40 percent of the grade and an 80 percent worth 60 percent give (3,600 plus 4,800) over 100, which lands at 84 percent, a B. This grade calculator does that for as many rows as you add, and when you skip the weights it switches to a straight average. You'll see the letter next to the percent, so there's no second lookup.
Working out a class grade, step by step
Here's a course with homework at 40 percent scoring 90, and exams at 60 percent scoring 80. It's the same method the tool runs for any number of rows:
- 1
Weight each scoreHomework is 90 times 40, which is 3,600, and exams are 80 times 60, which is 4,800.
- 2
Add the weighted scores3,600 plus 4,800 is 8,400 across the two parts.
- 3
Add the weightsThe weights are 40 plus 60, so 100 in total.
- 4
Divide for the grade8,400 divided by 100 is 84 percent, which is a B.
Percent to letter grade
Here's the common US scale the calculator uses for the letter. Schools vary by a point or two at the cutoffs, so treat the edges as a guide rather than a rule. If you're right on a boundary, it's worth checking your syllabus, since that's where a half-point can change the letter and you don't want a surprise.
| Percent | Letter | Percent | Letter |
|---|---|---|---|
| 93 to 100 | A | 73 to 76 | C |
| 90 to 92 | A- | 70 to 72 | C- |
| 87 to 89 | B+ | 67 to 69 | D+ |
| 83 to 86 | B | 60 to 66 | D |
| 80 to 82 | B- | Below 60 | F |
Frequently asked questions
Multiply each score by its weight, add those up, then divide by the total weight. So a 90 percent worth 40 percent of the grade plus an 80 percent worth 60 percent gives (3,600 + 4,800) divided by 100, which is 84 percent. This grade calculator runs that for every row you add, so you'll get the overall percent and the letter without doing the weighting by hand.
Weights say how much each part counts, like homework at 20 percent and exams at 50 percent. A high score in a heavily weighted part moves your grade far more than the same score in a light one. Type the weight next to each score and the tool handles the rest. If you leave the weights blank, it falls back to a simple average instead.
Put the points you earned in the score box and the points possible in the out of box, and the tool converts it to a percent for you. So 18 out of 20 reads as 90 percent. If you already have a percent, just type it in the score box and leave out of blank. You can mix the two across rows, since each one converts on its own.
On the common US scale, 90 and up is an A, 80 to 89 is a B, 70 to 79 is a C, 60 to 69 is a D, and below 60 is an F, with pluses and minuses at the edges. The tool shows your letter next to the percent using that scale. Your school's cutoffs might shift a point or two, so check the syllabus if you're right on a boundary.
Both. For a single test, drop in the points you earned and the points possible and read the percent. For a whole class, add a row per assignment or category with its weight, and the tool blends them into your course grade. It's the same math underneath, so you don't need a different tool for each.
Yes on both. There's no sign-up, no limit, and nothing to install, since it runs in your browser. The scores and weights you type stay on your device and aren't sent anywhere. Bookmark it and you'll have a quick way to check a grade before a deadline or after a test whenever you want.
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