What Is the Easy Grader Calculator?
The Easy Grader Calculator is a fast grading tool for teachers, tutors, and students. Instead of doing mental math for every paper, you simply enter the total number of questions on the test and how many a student got wrong. The calculator instantly returns the grade as a percentage and a standard A–F letter grade. It works for quizzes, exams, worksheets, and homework of any size.
How to Use It
Enter the Total Questions on the assessment, then enter the Number Wrong (the points or items the student missed). Press calculate to see the percentage score, the matching letter grade, and a breakdown of correct vs. wrong answers. Reuse it for every student by changing only the number wrong.
The Formula Explained
The grade is the share of correct answers expressed as a percentage:
$$\text{Grade} = \frac{\text{Total} - \text{Wrong}}{\text{Total}} \times 100\%$$
First the wrong answers are subtracted from the total to find how many were correct. That correct count is divided by the total and multiplied by 100 to convert it into a percentage. Letter grades follow the common US scale: 90+ = A, 80–89 = B, 70–79 = C, 60–69 = D, below 60 = F.
Worked Example
Suppose a quiz has 20 questions and a student misses 3. Correct = \(20 - 3 = 17\). $$\text{Grade} = \frac{17}{20} \times 100 = 85\%$$ That falls in the 80–89 range, so the letter grade is a B.
FAQ
Can I use partial points instead of whole questions? Yes — enter the total possible points as "Total Questions" and points lost as "Number Wrong"; the percentage math is the same.
What if a student gets everything right? With 0 wrong, the grade is 100% (an A).
Are the letter grade cutoffs fixed? They use the standard A/B/C/D/F scale (90/80/70/60). Your school's scale may differ slightly, but the percentage shown lets you apply any cutoff.
