Turn correct answers into a percentage and letter grade instantly, and work backward too — find out exactly how many questions you can afford to miss and still hit your target grade.
A test score calculator instantly converts the number of questions you answered correctly into a percentage score and letter grade, and shows you exactly how many questions you can afford to miss while still reaching common grade targets like an A, B, or a passing score. Simply enter how many questions you got correct out of the total, and the calculator handles the rest.
Students frequently need to quickly figure out their test performance right after finishing an exam, or plan ahead by asking 'how many can I get wrong and still pass?' before or during a test. Because the relationship between missed questions and percentage score depends heavily on the total number of questions, this isn't always simple mental math — a 2-question miss means something very different on a 10-question quiz than on a 100-question final.
This calculator is useful for students checking their score immediately after a test, for planning how carefully they need to answer remaining questions during an exam, and for understanding exactly how grade thresholds translate into a concrete number of allowable mistakes.
A student answers 42 questions correctly out of 50 total questions on a test. Score % = (42/50) × 100 = 84%, which corresponds to a letter grade of B. The student missed 8 questions.
Your score percentage represents the straightforward proportion of questions you answered correctly, and the letter grade shown reflects where that percentage falls on the standard grading scale — but always confirm against your specific instructor's grading policy, since scales can vary. The 'maximum questions you can miss' table shows you, for each grade tier, exactly how many incorrect answers you could have and still reach that grade — this number is always rounded down, since you can't miss a fraction of a question, which means the true cutoff can feel slightly stricter than a raw percentage calculation might suggest. Keep in mind this calculator assumes every question is weighted equally; if your test has some questions worth more points than others, use total points earned and total points possible instead of raw question counts for an accurate result.
Enter how many questions you got correct out of the total number of questions to calculate your score and see how many you could afford to miss.
| Target Grade | Max Questions You Can Miss |
|---|---|
| A+ (97%+) | — |
| A (93%+) | — |
| A- (90%+) | — |
| B (83%+) | — |
| C (73%+) | — |
| D (63%+) | — |
| Passing (60%+) | — |