Test Grade / Score Calculator (Teacher)

Divide the number of correct answers by the total number of questions, then multiply by 100. For example, if a student gets 17 out of 20 correct, the score is (17 / 20) × 100 = 85%. This calculator does that math for you the moment you enter the totals.

Simply enter the total number of questions on the test and how many the student got wrong. The calculator immediately shows the percentage score, letter grade, and a full grading chart for every possible number of wrong answers — making it easy to grade a whole stack of tests.

The standard scale used here is: A+ (97–100%), A (93–96%), A- (90–92%), B+ (87–89%), B (83–86%), B- (80–82%), C+ (77–79%), C (73–76%), C- (70–72%), D+ (67–69%), D (63–66%), D- (60–62%), and F (below 60%). The grading chart below the result shows every score at a glance.

27 out of 40 equals 67.5%, which falls in the D+ range under a standard grading scale. Whether that is considered passing depends on the institution — most schools require at least 60–70% to pass.

With 7 wrong answers out of 40 questions, the student got 33 correct, giving a score of (33 / 40) × 100 = 82.5%, which is a B- on a standard grading scale.

75 out of 80 equals 93.75%, which is an A on a standard grading scale. It falls within the A range (93–96%), so yes — that is an excellent score.

Absolutely. This tool works for any scored assessment — tests, quizzes, homework, or exams. As long as you know the total number of questions and how many were missed, it will calculate the grade.

Both give you the same result — entering the number wrong tells the calculator how many the student missed, and it subtracts that from the total to find correct answers. You can verify the correct count in the results section. The formula is: correct = total − wrong, and score = (correct / total) × 100.