EZ Grader Online: Calculate Test Grades From Wrong Answers
Turn hours of manual test grading into minutes. Calculate exact percentages, academic letter grades (A+ through F), support partial credit, and generate session score tallies with zero calculation errors.
Disclaimer: EasyGraderLab is an independent online tool and is not affiliated with The Original E-Z Grader or any physical grading product.
- ↑ ↓ Adjust wrong answers
- W Add wrong answer
- U Undo last adjustment
- R Reset / Next student paper
- C Copy score to clipboard
Session Class Tally
Scores graded during this active session. Kept on this device only; no data is ever sent to a server.
Easy Grader Scale Reference Chart
Complete score matrix for 10 questions. Click any card to apply the score.
Custom Grading Scale Editor
Mathematical Formula & Grading Methodology
EasyGraderLab uses standard pedagogical rounding algorithms to eliminate fractional calculation discrepancies across tests of any size.
Correct Answers = Total Questions - Wrong Answers Score Percentage = Round((Correct Answers / Total Questions) × 100) Our calculation engine applies standard half-up rounding (e.g. 89.5% rounds up to 90% A-), ensuring consistent, fair grading standards across all class sections. For course-wide GPA impact, check our GPA Calculator.
Practical Test Grading Examples
Here is how our EZ Grader engine evaluates student scores across common test lengths:
25-Question Science Quiz
B+50-Question History Midterm
B20-Question Math Check
A-100-Question Final Exam
BHow to Use the Online EZ Grader: Step-by-Step
Input Total Questions
Type the number of test questions into the input or click one of the quick presets (10, 15, 20, 25, 30, 50, 100).
Enter Wrong Answers or Partial Credit
Count missed questions and tap ↑ or W. Enable half-points for 0.5 step partial credit.
Instant Score Display & Scale Highlighting
Instantly read the percentage and letter grade on the purple result card and verify against the highlighted score card.
Log to Session Tally & Reset for Next Paper
Press R or click 'Next Student' to log the score to your class tally and reset wrong answers to 0 for the next paper.
Common Educator & Student Use Cases
K-12 Classroom Teachers
Grade entire stacks of 30+ quizzes in minutes. Log session totals into the class tally and paste directly into your gradebook.
College Professors & TAs
Standardize grading across multiple lab sections with uniform percentage-to-letter grade conversion scales and 7-point options.
Homeschooling Parents & Tutors
Accurately score practice exams, support partial credit with half-points, and print physical grade matrices for student portfolios.
Standardized Exam Prep
Score mock SAT, ACT, AP, and GRE practice test sections instantly with custom question totals up to 200 questions.
Frequently Asked Questions About EZ Grader
How do I calculate a test grade from missed questions?
Subtract wrong answers from total questions to find correct answers, divide by total questions, and multiply by 100: ((Total - Wrong) / Total) × 100.
How does standard half-up rounding handle borderline scores like 89.5%?
Under standard academic half-up rounding, a score of 89.5% rounds up to 90% (A-). If your school requires floor rounding, you can select 'Round down' to keep 89.5% at 89% (B+).
Can I award half points for partial credit on student answers?
Yes! Toggle the 'Allow half points' checkbox to adjust wrong answers in 0.5 increments, allowing precise scoring for multi-part questions.
How does the session Class Tally work and is student data saved?
The Class Tally records scores and grades for your current grading session directly in your browser. No student names or data are ever sent to a server or stored remotely.
Can I customize the minimum percentage required for each letter grade?
Yes. Choose 'Custom Scale' in the grading scale menu and click 'Edit Scale' to define custom percentage cutoffs. Your custom scale is saved in your local browser storage.