Test Grade Calculator
Miss 3 questions out of 20 and you score 85%, a B. This test grade calculator turns total questions and questions missed into a percentage score and a letter grade. Teachers use it to grade a stack of quizzes fast, and students use it to see how many questions they can afford to miss.
Quick answer
Score = correct answers divided by total questions, times 100.
Score
85%
Letter grade
B
Correct answers
17 of 20
What this tells you
- •Score = correct answers divided by total questions, times 100.
- •Letter grades use the standard scale: A 90+, B 80-89, C 70-79, D 60-69, F below 60.
- •Every question is weighted equally.
- •Enter the questions missed, not the questions correct.
How to Use
- 1Enter the total number of questions on the test.
- 2Enter how many questions were answered wrong.
- 3Read the percentage score and letter grade below.
How It Works
Formula
score % = (total - wrong) / total x 100Subtract the wrong answers from the total to get the correct count, divide by the total, then multiply by 100. For a 20 question test with 3 wrong, that is 17 divided by 20 times 100, which is 85%.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
20 questions, 3 wrong
17 of 20 correct is 85%, which lands in the B range on the standard scale.
50 questions, 8 wrong
42 of 50 correct is 84%.
Grades for a 20 Question Test
Score and letter grade by questions missed.
| Wrong answers | Score | Letter grade |
|---|---|---|
| 0 | 100% | A |
| 1 | 95% | A |
| 2 | 90% | A |
| 3 | 85% | B |
| 4 | 80% | B |
| 5 | 75% | C |
| 6 | 70% | C |
| 8 | 60% | D |
| 9 | 55% | F |
Letter grades assume the common 90/80/70/60 scale. Your school may use different cutoffs.
Common mistakes
- Entering correct answers in the wrong field. This tool asks for questions missed.
- Assuming every school uses the 90/80/70/60 scale. Some use plus and minus bands or a 93 cutoff for an A.
- Using it for weighted tests. If some questions are worth more points, grade by points instead of question counts.