Test Score Calculator
| Missed | 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 |
Letter grade bands
US scale| A+ | 97 and up |
| A | 93 – 96.9 |
| A− | 90 – 92.9 |
| B+ | 87 – 89.9 |
| B | 83 – 86.9 |
| B− | 80 – 82.9 |
| C+ | 77 – 79.9 |
| C | 73 – 76.9 |
| C− | 70 – 72.9 |
| D+ | 67 – 69.9 |
| D | 60 – 66.9 |
| F | below 60 |
The letter beside your average uses these common US bands — your school's cutoffs may differ. Averages round half up to two decimals, the way most gradebooks do.
Enter the questions or points you got right and what the test was out of to get your percentage and letter grade. The grading chart lists every possible score for a test of that length, one row per question missed.
The maths
How a test score is calculated
score = correct ÷ total × 100Correct is what you got right, in questions or points, and total is what the test was out of. The score rounds half up to two decimals, the way most gradebooks do.
Questions: 17 right out of 20 → 17 ÷ 20 × 100 = 85, a B.
Points: 43.5 out of 50 → 43.5 ÷ 50 × 100 = 87, a B+.
Mixed points: 23 out of 28 → 82.14, a B−.
How many you can miss
The most questions you can miss and still reach each grade (common US cutoffs):
| Questions | 90% (A−) | 80% (B−) | 70% (C−) | 60% (D) |
|---|---|---|---|---|
| 10 | 1 | 2 | 3 | 4 |
| 20 | 2 | 4 | 6 | 8 |
| 25 | 2 | 5 | 7 | 10 |
| 30 | 3 | 6 | 9 | 12 |
| 40 | 4 | 8 | 12 | 16 |
| 50 | 5 | 10 | 15 | 20 |
To average several tests, use the test average calculator; to see what you need on an exam still to come, use the final grade calculator.
Answers
Frequently asked questions
How do I calculate my test score percentage?
Divide what you got right by the total and multiply by 100: 17 out of 20 is 17 ÷ 20 × 100 = 85%. Points work the same way, so 43.5 out of 50 points is 87%.
How many questions can I miss and still get an A?
On the common US scale an A− starts at 90%, so you can miss a tenth of the test: 2 of 20, 3 of 30 or 5 of 50. The table above gives the count for other test lengths and grades.
What if the questions are worth different points?
Add up the points you earned and the points possible, then enter those two totals. A test of 18 one-point questions and two 5-point essays is out of 28; earning 23 of those points scores 82.14%.
How do I turn a percentage into a letter grade?
The badge beside your score uses common US bands: 93 and up is an A, 90 an A−, 87 a B+, 83 a B and 80 a B−, and so on down to 60, below which is an F. Schools set their own cutoffs, so check your syllabus.
Does the grading chart work for quizzes and homework?
Yes. Anything scored as right out of a total works the same way. Enter the number of questions as the total and the chart lists every possible score, one row per question missed.
Can a test score be over 100%?
Yes, with extra credit: 22 out of 20 is 110%. The calculator accepts it and shows the score as it is.