Enter the number of questions correct or wrong and instantly see your percentage score, letter grade, and a full EZ-grader reference table.
| Wrong | Score | Grade |
|---|---|---|
| 0 | 100% | A |
| 1 | 95% | A |
| 2 | 90% | A |
| 3 | 85% | B |
| 4 | 80% | B |
| 5 | 75% | C |
| 6 | 70% | C |
| 7 | 65% | D |
| 8 | 60% | D |
| 9 | 55% | F |
| 10 | 50% | F |
| 11 | 45% | F |
| 12 | 40% | F |
| 13 | 35% | F |
| 14 | 30% | F |
| 15 | 25% | F |
| 16 | 20% | F |
| 17 | 15% | F |
| 18 | 10% | F |
| 19 | 5% | F |
| 20 | 0% | F |
Your percentage score is simply the number of correct answers divided by the total number of questions, multiplied by 100. If your teacher applies a curve, those extra points are added to the raw percentage before assigning a letter grade.
The standard letter-grade scale used here is: 90–100% = A, 80–89% = B, 70–79% = C, 60–69% = D, below 60% = F. Some schools use +/– grades or different cutoffs — check with your teacher if you're unsure.
An EZ grader is a reference chart that shows the percentage score and letter grade for every possible number of wrong answers on a given test. Teachers use it to grade papers quickly without re-calculating each time.
A curve adds a fixed number of percentage points to every student's raw score. For example, a 5-point curve turns a 78% into an 83%. Enter the curve your teacher announced in the 'Curve points' field.
The standard scale treats exact boundaries as the higher grade: a 90% is an A, an 80% is a B, and so on. This calculator follows that convention.
This calculator converts a raw test score — questions answered correctly (or wrongly) out of a total — into a percentage and a standard letter grade. It works like the classic "EZ Grader" teachers keep on their desks: enter any combination of correct answers and total questions, and the result appears instantly. An optional curve field lets you add bonus points before the letter grade is assigned.
The headline figure is your percentage score for the inputs you entered. The letter grade (A/B/C/D/F) appears directly below it, colour-coded for quick reading. Below the result card, the EZ-grader reference table lists every possible number of wrong answers for the same total, showing the corresponding percentage and letter grade for each row; your current score is highlighted in the table so you can see how one or two extra correct answers would change the grade.
18 correct answers out of 20 total questions, no curve.
18 ÷ 20 × 100 = 90.0%, which falls in the A band (90–100). The reference table shows that missing just one more (17/20 = 85.0%) would drop the grade to a B.
The formula is simply (correct ÷ total) × 100. If you enter wrong answers instead, the calculator converts them first: correct = total − wrong. Any curve points are then added to the raw percentage, and the result is clamped to a maximum of 100.
The calculator uses the standard US scale: 90–100 → A, 80–89 → B, 70–79 → C, 60–69 → D, and below 60 → F. These thresholds match the reference values published by Calculator.net and confirmed by ThoughtCo.
Curve points are added directly to the raw percentage after dividing correct by total. For example, a 5-point curve on a 70% raw score gives 75%, raising the grade from a C to a C (just under B). Curve points are capped so the final percentage never exceeds 100.
This calculator assumes every question is worth one point. For tests with different point values per question, use a weighted-grade calculator instead and enter total points earned versus total points possible.
Each row in the table represents a different number of wrong answers for the total you entered. Read across to see the resulting percentage and letter grade. Your own score is highlighted. The table makes it easy to tell students — or yourself — exactly how many correct answers are needed for each grade band.
The percentage score is computed as percent = (correct / total) × 100 + curvePts, clamped to the interval [0, 100]. The letter grade is then assigned using the standard five-band scale: a percentage of 90 or above earns an A, 80–89 a B, 70–79 a C, 60–69 a D, and anything below 60 an F. These cutoffs are consistent across the two authoritative references used for this calculator: the Calculator.net EZ-grader tool and the ThoughtCo grade-percentage guide. The full reference table is generated by iterating wrong from 0 to total, computing correct = total − wrong for each step, and applying the same formula to produce a row of (wrong, percent, letter) for every possible outcome.
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