Test Grade Calculator
Marking a test comes down to a simple ratio: correct answers over total questions, expressed as a percentage. This calculator returns that percentage, the letter grade on the common United States scale, the number of points lost, and how many more correct answers you would need to hit a target grade. It works for question counts or for points if you enter points earned and total points. Grading policies vary, so treat the letter as a guide and follow your instructor's official scale and rounding rules.
Test grade formula
Score % = correct / total * 100
Points lost = total - correct
Needed for target = ceil(target / 100 * total) - correct
Letter: A >= 90, B >= 80, C >= 70, D >= 60, else F
The score is a pure ratio. The letter mapping uses the common US scale; your school may set different cut-offs. The needed figure rounds up because you cannot answer a fraction of a question correctly.
Reading your result
- The percentage is the same whether you count questions or points.
- The standard US scale puts the A boundary at 90 percent and a pass typically at 60.
- Points lost shows how many marks separated you from a perfect score.
- The needed figure tells you the minimum extra correct answers for your target.
- Curves, extra credit, and rounding are set by your instructor and not applied here.
Test grade: frequently asked questions
How is a test grade percentage calculated?
Divide the number of correct answers by the total number of questions, then multiply by 100. For example 42 correct out of 50 is 42 divided by 50, which is 0.84, or 84 percent. The calculator does this exactly from the numbers you enter.
What letter grade does each percentage get?
This calculator uses the common United States scale: 90 and above is A, 80 to 89 is B, 70 to 79 is C, 60 to 69 is D, and below 60 is F. Schools and instructors set their own cut-offs, so check your syllabus; you can read your percentage against any scale.
How many more questions do I need for a target grade?
Enter your target percentage and the calculator multiplies it by the total questions to find the correct answers required, then subtracts what you already have right. If the result is zero or negative you have already met the target.
Does this handle weighted or partial-credit questions?
It treats every question as equally weighted and either right or wrong. For weighted tests, enter points earned as the correct figure and total points as the total, since the percentage formula is identical when you use points instead of question counts.
Why might my school grade differ?
Grading scales, rounding rules, curves, and extra credit differ by institution. This tool reports the raw percentage and the standard-scale letter as a guide. Always defer to your instructor's stated policy for the official grade.
Official sources
- U.S. Department of Education: Department of Education (grading and assessment guidance).
- National Center for Education Statistics: NCES education data.
Reviewed by the CalculatorHub team, edited by James Graham, 16 June 2026. See our methodology.