Quiz Grade Calculator with Curves
A quiz grade calculator turns one assessment into a percent and a letter grade. Use question-count mode when you know the total questions and how many were wrong or correct. Switch to points mode when partial credit or uneven point values matter. Use the target mode before the quiz when the question is how many answers you can miss and still reach a target percent. A flat curve and grading-scale selector are available, but this page stays focused on one quiz, test, or assignment rather than a full course grade.
Getting the right grade out of the right mode
Most quiz-grade mistakes come from choosing the wrong mode or trusting the wrong grading scale. Match the input to the way the assessment was scored before you read the letter grade.
Use count mode for equal-value questions. Use points mode when partial credit, bonus points, or uneven question values matter.
Count mode defaults to wrong answers. Check the toggle before entering the number from your paper.
Blank or skipped questions usually count as wrong unless your instructor says otherwise.
Plus/minus and letter-only scales split the same percentage differently near a cutoff.
Example: 7 wrong on a 40-question quiz
A 40-question quiz with 7 wrong means 33 correct. The raw score is 33 / 40 x 100 = 82.5%, which maps to B- on the plus/minus scale and B on the letter-only scale. If the instructor adds a 5 percentage-point flat curve, the score becomes 87.5%, which maps to B+ on the plus/minus scale. If the same quiz was graded with half credit, such as 33.5 out of 40 points, points mode is the better input because it preserves the partial point.
Question count vs. points earned
Question-count mode treats every question as one point, so it is fastest for simple right/wrong quizzes and teacher easy-grader workflows. Points mode is for partial credit, labs, essays, and tests where questions have different point values. Forcing a points-based score through count mode throws away the scoring detail that changes the percent.
How many answers can I miss?
Maximum-wrong mode starts from a target percent and total question count. It calculates the minimum correct answers needed, rounds that requirement up to a whole question, and subtracts from the total. If you enter a flat curve, the calculator accounts for that bonus before finding the raw correct count.
What the flat curve means
The curve here is a fixed percentage-point bonus. A 5-point curve turns 82% into 87%; it is not a bell curve, class-rank curve, dropped-question adjustment, or scale-to-the-highest-score policy. If your instructor curves a class another way, use the calculator only as a quick approximation.
Letter scales are policy, not math
The default plus/minus scale uses cutoffs such as A- at 90 and B+ at 87. Letter-only uses the simpler 90/80/70/60 bands. The calculator applies the selected scale, but the official answer is the one in your syllabus or gradebook, especially near a boundary.
When another grade calculator fits better
Use the Grade Calculator when this quiz is one weighted piece of a course average. Use the Final Grade Calculator when the question is the score needed on one remaining exam or assignment to reach a course target. This quiz calculator does not model GPA, drops, retakes, late penalties, or a custom gradebook policy.