Test Grade Calculator
Enter the total number of questions and how many you missed to see the percentage and letter grade, with a full grade chart for that test.
Last updated October 19, 2026
Result
88%
Letter grade: B
22 of 25 correct, 3 missed
Grade chart
| Missed | Percentage | Letter grade |
|---|---|---|
| 0 | 100% | A |
| 1 | 96% | A |
| 2 | 92% | A |
| 3 | 88% | B |
| 4 | 84% | B |
| 5 | 80% | B |
| 6 | 76% | C |
| 7 | 72% | C |
| 8 | 68% | D |
| 9 | 64% | D |
| 10 | 60% | D |
| 11 | 56% | F |
| 12 | 52% | F |
| 13 | 48% | F |
| 14 | 44% | F |
| 15 | 40% | F |
| 16 | 36% | F |
| 17 | 32% | F |
| 18 | 28% | F |
| 19 | 24% | F |
| 20 | 20% | F |
| 21 | 16% | F |
| 22 | 12% | F |
| 23 | 8% | F |
| 24 | 4% | F |
| 25 | 0% | F |
Show the work
- Correct = 25 - 3 = 22
- (25 - 3) / 25 × 100 = 88%
- 88% is a B on the standard scale.
How a test grade is calculated
score % = (total − missed) ÷ total × 100
The calculator subtracts the questions you missed from the total, divides by the total and multiplies by 100. The letter grade uses the standard US scale (90 is an A, 80 a B, 70 a C, 60 a D) or the plus and minus scale, which you can choose.
The grade chart lists the percentage and letter for every possible number of missed questions on the same test, so you can read a result straight from the table. Every question is assumed to be worth the same number of points; for points, enter the total points and the points lost.
See how we calculate for the formulas, sources and review schedule behind every calculator.
What each question is worth
On a test where every question counts the same, each question is worth 100 ÷ total percentage points. On a 20-question test that is 5 points per question, on 25 questions it is 4, on 40 questions it is 2.5 and on 50 questions it is 2. On 30 questions each one is worth about 3.33 points, which is why the percentages for 30-question tests are rarely round numbers.
This is also the quickest way to estimate a grade without a calculator: take 100 and subtract the points per question for each one you missed.
How many questions can you miss and keep a grade?
To stay at or above a cutoff, multiply the total by the cutoff and round up to find the number you must answer correctly. For an A (90%) on a 25-question test you need at least 22.5, so 23 correct, which means you can miss at most 2. For a B (80%) you need 20 correct and can miss 5. Missing 3 gives 88%, a B.
The same cutoff is a smaller allowance on a short test. On a 10-question quiz one miss is already 90%, and a second miss drops it to 80%.
Standard and plus and minus scales
The standard scale starts a letter at 90, 80, 70 and 60. The plus and minus scale used here starts A+ at 97, A at 93, A− at 90, B+ at 87, B at 83, B− at 80, and follows the same pattern for C and D, with D− at 60. Below 60 is an F on both.
Because the cutoffs apply to the exact percentage, close results can land on either side of a line. On a 30-question test with 4 missed, 26 ÷ 30 = 86.67%, which is a B on both scales, just short of the B+ cutoff of 87. On a 40-point test with 7 points lost, 33 ÷ 40 = 82.5%, a B on the standard scale and a B− on the plus and minus scale. Your teacher’s scale may use different cutoffs or rounding rules, so check the syllabus.
How to use the Test Grade Calculator
- Enter the total number of questions or points on the test.
- Enter how many you missed or lost.
- Choose the standard or the plus and minus letter scale.
- Read the percentage and letter grade, open the grade chart for the whole table, then use Copy, Print or Share.
Worked example
On a 25-question test with 3 questions missed, (25 − 3) ÷ 25 = 22 ÷ 25 = 0.88, which is 88%. That is a B on the standard scale and a B+ on the plus and minus scale.
| Questions missed | Percentage | Letter grade |
|---|---|---|
| 0 | 100% | A |
| 1 | 96% | A |
| 2 | 92% | A |
| 3 | 88% | B |
| 4 | 84% | B |
| 5 | 80% | B |
| 6 | 76% | C |
| 7 | 72% | C |
| 8 | 68% | D |
| 9 | 64% | D |
| 10 | 60% | D |
| 11 | 56% | F |
Frequently asked questions
How do I calculate a test grade from the questions I missed?
Subtract the missed questions from the total, divide by the total and multiply by 100. For 3 missed out of 25, that is 22 ÷ 25 × 100 = 88%.
Does every question count the same?
Yes, this calculator assumes equal points per question. If questions are worth different points, enter the total points and the points lost instead.
What is the difference between the two letter scales?
The standard scale gives one letter per ten points (A, B, C, D, F). The plus and minus scale splits each band, so 88% is a B+ instead of a B. Your teacher’s scale may differ.
How many questions can I miss and still get an A?
On the standard scale you can miss up to 10% of the questions: 2 of 25, 3 of 30 or 5 of 50. On a 20-question test you can miss 2 and still score exactly 90%.
Are my numbers stored or sent anywhere?
No. The calculation runs in your browser and nothing you enter is saved or uploaded.