Grade Calculator – Percentage & Letter Grade Table
This easy grade calculator helps teachers and students instantly generate a complete grading table based on the total number of questions in a test. Simply enter the total number of questions and the tool automatically calculates percentage scores, correct answers, wrong answers, and corresponding letter grades.
What This Grade Calculator Does
This tool generates a full grading chart showing how many answers can be wrong while still achieving specific percentages and letter grades. It is especially useful for teachers grading quizzes and exams.
How the Grade Percentage Is Calculated
The percentage formula used is:
(Correct Answers ÷ Total Questions) × 100
For example, if a test has 100 questions and a student answers 90 correctly:
(90 ÷ 100) × 100 = 90%
Letter Grade Scale Used
- 90% and above – Grade A
- 80% to 89% – Grade B
- 70% to 79% – Grade C
- 60% to 69% – Grade D
- Below 60% – Grade F
Who Should Use This Tool?
- Teachers grading multiple choice tests
- Students checking expected grades
- Parents reviewing exam performance
- Homeschool educators tracking results
Why This Tool Is Useful
Instead of manually calculating each percentage, this calculator generates the full grading breakdown instantly. It saves time and ensures accuracy.
Tips for Teachers
- Use this chart to quickly determine grade cutoffs.
- Adjust grading scale if your school uses a custom system.
- Print or export the table for classroom reference.
Limitations
This calculator uses a standard grading scale. Some institutions may use plus/minus grading or different thresholds.