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Average your test scores with the letter grade.
List your test scores and get the average instantly, along with the letter grade it earns on the standard scale. You can paste scores separated by commas or spaces. A quick way to see where you stand across a term without digging out a spreadsheet.
A test-score average is the arithmetic mean of your scores: add them up and divide by how many there are. It is the number teachers mean by 'your average,' the number behind most gradebook calculations, and the input to GPA math downstream. The mean has one famous vulnerability — it is sensitive to outliers. A single missed exam scored as zero can crater an otherwise strong average, which is exactly why many instructors drop the lowest score or allow a retake: those policies are outlier insurance, not generosity.
Dropping the lowest score changes the math in your favor by removing the minimum before dividing. With scores of 70, 85, 88, and 92, the straight mean is (70 + 85 + 88 + 92) / 4 = 335 / 4 = 83.75; dropping the 70 gives (85 + 88 + 92) / 3 = 265 / 3 = 88.33 — a gain of 4.58 points from one policy. Weighted averages add a further layer: if tests have different point values, each score counts in proportion to its points, so a 200-point final swings the average more than a 50-point quiz.
When comparing averages, remember the mean is not the whole story. The median (middle value) resists outliers and sometimes better represents 'typical' performance; the range shows consistency. But for gradebooks, the mean rules — compute it exactly, know your instructor's drop and weighting policies, and you will never be surprised by a report card.
The scores are added together and divided by how many there are, then mapped to a letter grade (A = 90+, B = 80+, C = 70+, D = 60+).
Scores: 82, 90, 76, 88. Sum: 82 + 90 + 76 + 88 = 336. Divide by 4: 336 / 4 = 84.0. As a letter grade, 84 is typically a B. Now apply a drop-the-lowest policy: remove 76, sum the rest: 82 + 90 + 88 = 260, divide by 3: 260 / 3 = 86.67, or 86.7. The single dropped score lifted the average 2.7 points — nearly a third of a letter grade — which is why knowing the policy before the final is worth real money in GPA terms.
Quiz: 45/50. Midterm: 160/200. Final: 270/300. Do not average the percentages (90, 80, 90) equally — the tests carry different weights. Total earned: 45 + 160 + 270 = 475. Total possible: 50 + 200 + 300 = 550. Average: 475 / 550 = 0.8636, or 86.4 percent. Compare the naive mean of percentages: (90 + 80 + 90) / 3 = 86.7 — close here, but the gap widens whenever the low score sits on the heavy test. The points method is always correct; the percentage-average method is correct only when every test has equal weight.
Add all your scores together and divide by the number of tests. Three scores of 80, 90, and 100 average to 270 ÷ 3 = 90.
On the standard US scale, 90+ is an A, 80+ a B, 70+ a C, 60+ a D, and below 60 an F. Some schools set their own boundaries, so check your syllabus.
Yes — decimals like 87.5 are accepted and included exactly, which is useful when a test was scored out of an odd total.