ExamTally → Average Grade Calculator
Average Grade Calculator
Enter a list of grades — optionally weighting some more than others — and ExamTally stamps the mean percentage and letter grade instantly.
To average your grades, add them up and divide by how many there are. Grades of 90, 84, and 78 average to (90 + 84 + 78) ÷ 3 = 84%, a B on the standard scale. Add an optional weight to any row to make it count more. Enter your own grades below.
Key takeaways
- Average = sum of grades ÷ number of grades.
- Add weights to make some grades count more — it becomes a weighted mean.
- Blank grade rows are skipped, so enter as few or as many as you need.
- 90, 84, 78 → 84% → B.
- Letters use the default US scale — confirm your syllabus.
How the average is calculated
A simple average — the mean — adds every grade and divides by the count. When all your assignments are worth the same, that's all you need. If some count more, fill in the weight column and the calculator switches to a weighted mean: each grade is multiplied by its weight before summing, then divided by the total of the weights.
If a row's weight is blank it counts as 1, so mixing weighted and unweighted rows still works. The calculator only averages rows that have a grade, and it waits until at least one grade is entered — there's no dividing by zero.
Worked example: three grades
Suppose you scored 90, 84, and 78 with no weights. Add them: 90 + 84 + 78 = 252. Divide by the count, 3: 252 ÷ 3 = 84%. On the standard scale that's a B. Now weight the 90 as a 2 (a midterm) and the others as 1: (90·2 + 84·1 + 78·1) ÷ 4 = 342 ÷ 4 = 85.5% — still a B, but the heavier score pulls it up.
Standard A–F grading scale
| Letter | Percentage | GPA points (4.0) |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89% | 3.0 |
| C | 70–79% | 2.0 |
| D | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
This is the most common US scale. Your school may use plus/minus grades or different cutoffs — always confirm.
When categories carry fixed weights that total 100% (tests, homework, quizzes), the weighted grade calculator is a better fit. To turn letter grades into a 4.0-scale figure, use the GPA calculator, or work out the exam score you need with the final grade calculator.
Frequently asked questions
How do you calculate an average grade?
Add all the grades together and divide by how many there are. For example 90, 84, and 78 average to (90 + 84 + 78) ÷ 3 = 252 ÷ 3 = 84%, which is a B on the standard scale.
What if some grades should count more than others?
Fill in the optional weight column. Each grade is then multiplied by its weight, summed, and divided by the total weight — a weighted mean. Leave every weight blank and each grade counts equally. For category percentages that must total 100, the weighted grade calculator is purpose-built.
Do I need to fill in every row?
No. Blank grade rows are skipped, so you can enter as few or as many grades as you like and add more rows when you need them. The average always reflects only the grades you actually entered.
What letter grade is my average?
On the default US scale: A is 90–100%, B is 80–89%, C is 70–79%, D is 60–69%, and F is below 60%. The stamped badge recolors with the letter. Many schools use plus/minus bands or different cutoffs, so confirm yours.
Is a grade average the same as a GPA?
No. An average grade is the mean of your percentages (or points). A GPA converts each letter grade to points on a 4.0 scale and averages those, usually weighted by credit hours. Use the GPA calculator for the 4.0-scale figure.
How is the average rounded?
The mean is rounded to one decimal place, and a whole-number result shows without a decimal. Your teacher may round differently or drop the lowest score, so treat borderline letters as estimates and check the syllabus.
The average grade is mathematical: the mean of the grades you enter, or a weighted mean when weights are supplied. Letter-grade bands use the common US scale (A 90+, B 80+, C 70+, D 60+, F below 60); individual schools set their own cutoffs, pluses/minuses, and rounding rules.
Last reviewed 2026-06-28