Study & writing
Grade average calculator
Type each score as a percentage and get the simple average, the letter grade it maps to and your best and worst result.
Leave a field at 0 to ignore it. Enter each result as a percentage, not as raw points out of a different total.
How the average is worked out
This is an unweighted (simple) mean: add every score together and divide by how many scores there are. Each result counts the same, no matter how big the test was or how many points it carried. Because every score is already a percentage, the average is a percentage too, which is why you should convert raw marks to a percent before entering them.
Worked example: scores of 88, 76, 92 and 84. The sum is 88 + 76 + 92 + 84 = 340, and there are four scores, so the mean is 340 ÷ 4 = 85%. On the common United States scale that is a B. The highest mark is 92 and the lowest is 76, a 16-point spread that the single average hides.
| Average | Letter (US) | Typical meaning |
|---|---|---|
| 90–100% | A | Excellent |
| 80–89% | B | Good |
| 70–79% | C | Satisfactory |
| 60–69% | D | Passing but weak |
| Below 60% | F | Failing |
When a simple average is the wrong tool
Use the unweighted mean only when every score genuinely deserves equal weight, such as a set of quizzes that each count the same toward your grade. If a final exam is worth 40% and each quiz 10%, the simple average overstates the quizzes and understates the exam; a weighted calculation is the correct one there. Likewise, averaging percentages taken from tests of very different sizes can mislead, because a 50% on a two-question quiz is far less reliable than a 50% on a hundred-mark paper.
Watch the gap between your highest and lowest scores. A tight spread means the average describes your work well; a wide one means a single bad day or an outstanding result is pulling the figure around, and the median may describe you better. The letter grade here follows the scale most US schools publish, but cut-offs vary: some use 93% for an A, and many foreign systems do not use letters at all. Treat the letter as a guide and confirm the thresholds on your own syllabus before reading too much into a borderline result.
Frequently asked questions
How do I calculate my grade average?
Add all your scores and divide by the number of scores. For 88, 76, 92 and 84, that is 340 ÷ 4 = 85%. Enter each result as a percentage so they share the same scale.
What is the difference between a weighted and unweighted average?
An unweighted average treats every score equally. A weighted average multiplies each score by how much it counts, so a 40% final affects the result more than a 10% quiz.
What letter grade is an 85% average?
On the usual US scale 85% is a B, since B covers 80–89%. Your school may set the cut-offs slightly differently, so check the grading policy on your syllabus.