Test Grade Calculator
Turn a raw score into a percentage and letter grade — the classic EZ grader.
Reviewed by the WorldCalcs team · Methodology · Last reviewed: June 2026
Score
90% · A-
45 correct out of 50 on the common US plus/minus scale.
What is a test grade calculator?
A test grade calculator — sometimes called an EZ grader — turns a raw score into a percentage and a letter grade. Enter how many questions were answered correctly out of the total, and it works out the percentage so teachers can grade quickly and students can check a score in seconds.
How it's calculated
The percentage score is the number correct divided by the total number of questions, times 100: Score = (correct / total) × 100. The letter grade comes from where that percentage lands on the common US plus/minus scale (A 93–100, A- 90–92, and so on down to F below 60).
Example
On a 50-question test with 45 correct: 45 / 50 = 0.9, and 0.9 × 100 = 90%, which is an A- on the common scale. Get 7 out of 10 right and it is 70%, a C-.
All calculations happen in your browser. Nothing is sent, stored, or tracked.
Results are estimates and may contain errors — for general information only, not professional advice. Always verify before relying on them. Disclaimer
How to use
Enter the number of correct answers and the total number of questions. The percentage and letter grade update instantly.
Turn on “Show grading chart” to see the score for every possible result on a test of that size — handy for grading a stack of papers.