Understanding a 30-Question Test Scale
Taking a test with 30 questions means every single question is worth 3.33%. This gives a moderate cushion — missing a few questions won't drastically change your grade, but consistent mistakes will still add up.
To calculate your grade manually, subtract the number of wrong answers from 30 to find your total correct answers. Then, divide your correct answers by the total (30) and multiply the result by 100. For instance, if you miss 5 questions, you got 25 correct. 25 divided by 30 equals 0.8333, giving you exactly a 83.33%.
Here are the quick benchmarks for a standard 30-question grading scale:
- To get an A (90%+): You can miss no more than 3 questions.
- To get a B (80%+): You can miss between 4 and 6 questions.
- To get a C (70%+): You need at least 21 correct answers.
- To pass (60%+): You must get at least 18 questions correct.
If you're studying for an upcoming exam that happens to consist of exactly 30 questions, knowing how many questions you can safely miss is a great way to prioritize your time during the test. If you want to calculate how this test grade will impact your overall class average, jump over to our Final Grade Calculator.
Why Use This Pre-Computed Chart?
When grading a stack of papers, recalculating percentages for every paper that has a slightly different number of wrong answers gets time-consuming fast. A pre-computed rubric table removes that friction — print this scale or keep it pinned in a browser tab so you can look up a score the instant you count the number of incorrect marks on a student's exam sheet.