Test Grade Calculator (EZ Grader)
Enter how many questions the test had and how many were wrong — get the score, percentage and letter grade instantly, plus a full grading chart you can grade the whole class from.
Grade Any Test in Seconds
This test grade calculator works the way teachers actually grade: by the number wrong. Type in the total number of questions and how many a student missed, and it returns the score, the percentage, and a letter grade. It also builds a complete EZ-grader chart — a line for every possible number wrong — so once you have entered the question count, you can grade an entire stack of papers without touching the calculator again.
It is just as handy for students checking a practice test. No signup, nothing stored, works on any phone or laptop.
How the Score Is Worked Out
The formula behind every EZ grader is refreshingly simple:
Score % = ((Questions − Wrong) ÷ Questions) × 100
So a 25-question quiz with 4 wrong is (25 − 4) ÷ 25 = 21/25 = 84%. The reason teachers love the chart version is that the percentage per question never changes within a single test — each wrong answer on a 20-question test always costs 5%, so the chart lets you read off any score instantly.
The Letter-Grade Scale
This tool uses a common US-style scale. If your school uses different cut-offs, just read the percentage and apply your own:
- A — 90 to 100%
- B — 80 to 89%
- C — 70 to 79%
- D — 60 to 69%
- F — below 60%
Marking a weighted test instead of a flat quiz? Use the Exam Score Calculator for percentage and grade from raw marks, or the Final Grade Calculator if a student wants to know what they need on the final.
How to Use the Test Grade Calculator
- Enter the total number of questions on the test.
- Enter how many were wrong (or tick the box and enter how many were correct).
- Set the passing percentage if you want a pass/fail flag.
- Click "Calculate Grade" for the score, grade, and full chart.
Frequently Asked Questions
It takes total questions and number wrong, then computes (total − wrong) ÷ total × 100. For 20 questions with 3 wrong, that is 17/20 = 85%.
Enter the question count once and use the grading chart this tool builds — it lists the percentage for every possible number wrong, so each paper takes a glance.
A common US-style scale: A 90-100, B 80-89, C 70-79, D 60-69, F below 60. You can also set a custom passing percentage.