Test Grade Percentage Calculator
Marking a test comes down to one division: questions correct over questions total, times 100. This calculator does that instantly and also tells you how many you got wrong and which letter grade the score lands on. Because grading cutoffs vary between schools and even between teachers, the letter grade thresholds are yours to set: enter the A, B, C and D minimums from your own syllabus. Enter correct answers and the total to see your percentage, number wrong, and letter grade.
Test grade formula
Percentage = (correct / total) * 100
Questions wrong = total - correct
Letter grade = A if pct >= A min, else B if >= B min, else C, else D, else F
The percentage is a simple ratio of correct answers to total questions. The letter grade compares that percentage against the cutoffs you enter, so it always reflects your own grading scale rather than an assumed one.
Worked example
You score 43 correct out of 50. The percentage is 43 / 50 times 100 = 86.00 percent. You got 50 minus 43 = 7 questions wrong. On the default scale (A 90, B 80, C 70, D 60), 86 percent is at or above the B cutoff but below A, so the letter grade is B.
Test grade percentage: frequently asked questions
How do I calculate a test grade percentage?
Divide the number of questions answered correctly by the total number of questions, then multiply by 100. For example, 43 correct out of 50 is 43 / 50 = 0.86, which is 86 percent. If questions carry different point values, divide points earned by total points available instead.
What letter grade is my percentage?
The most common US scale is A = 90 percent and above, B = 80 to 89, C = 70 to 79, D = 60 to 69, and F below 60. Many schools use plus and minus bands or different cutoffs, so this calculator lets you set the A, B, C and D thresholds yourself to match your syllabus.
How many can I get wrong and still pass?
Multiply the total questions by your passing percentage to find the minimum correct, then subtract from the total to get the maximum you can miss. On a 50-question test with a 60 percent pass mark you need 30 correct, so you can miss up to 20. The calculator shows the number wrong for the score you enter.
Does this round the percentage?
The displayed percentage is shown to two decimal places. Whether your teacher rounds 89.5 up to an A depends on their rounding policy, which this tool cannot know. Check your syllabus: some round half up, some truncate, and some apply no rounding at all.
Sources and method
- Method: percentage equals correct divided by total times 100, a standard arithmetic definition. Letter-grade cutoffs are user inputs because US schools set their own scales.
- U.S. Department of Education general resources: ed.gov.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.