How to Grade Tests Quickly (Easy Grader Guide)
Grading a stack of tests by hand is slow — especially when you’ve got thirty quizzes and only one planning period. The good news: learning how to grade tests quickly comes down to one simple formula and a few habits that cut the busywork. Here’s the Easy Grader method, plus a worked example and tricks that make the whole pile go faster.
Quick answer: To grade a test, divide the number of correct answers by the total number of questions, then multiply by 100. For example, 17 out of 20 is 85%, which is a B.
How to calculate a test grade
Every test grade is the same calculation: divide the number of correct answers by the total number of questions, then multiply by 100.
(Correct answers ÷ Total questions) × 100 = Percentage grade
That percentage is the test grade. Convert it to a letter with your usual scale (90–100 = A, 80–89 = B, and so on).
Worked example: 17 out of 20
Say a student got 17 out of 20 right:
- Divide 17 by 20 to get 0.85.
- Multiply by 100 to get 85%.
- Convert to a letter grade: 85% = B.
Three quick steps, done — the same steps work for every paper in the stack.
Tips for grading faster
Once you know the formula, these habits shave real time off every batch:
- Use a grade chart instead of a calculator. Look the score up in a ready-made chart instead of doing the division thirty times — it turns every paper into a two-second glance.
- Batch by wrong answers. Before you calculate anything, sort papers by the number missed. Grading all the “3 wrong” papers together is much faster than switching gears for every paper.
- Grade one question across all papers. Score question 1 on every test, then question 2, and so on. You stay in the same “answer mindset” and catch mistakes faster.
- Keep an answer key handy. A printed key (or an overlay for multiple choice) beats flipping back to the key for every item.
- Round with a plan. Decide your rounding rule before you start — for example, always round up at .5 — so you never pause to debate a 79.5.
Grade your next test in seconds
Want to skip the math entirely? Try the free Easy Grader calculator — enter correct and total, and it gives you the percentage and letter grade instantly.
Prefer paper? Download the printable grade chart and look up any score in seconds, no calculator needed.