CalculateFinal

Grading Calculator

EZ-grader for teachers and students: enter questions and wrongs to get a live score, letter grade, and full grading chart.

  • 100% private
  • No sign-up
  • Always free
  • Instant results

Quick start

  1. Type how many questions are on the test.
  2. Use + / − (or type) for how many are wrong.
  3. Read the live score, letter grade, and full chart.

Grading example

You’re grading a 25-question quiz. One student missed 3 questions, so they got 22 correct. Enter the question count once, then bump the wrong count with + / − (or type 3) to see the score and letter grade update right away — handy when you’re working through a whole stack of papers.

  • # of questions: 25
  • # wrong: 3
  • Score math: (22 ÷ 25) × 100 = 88%
  • The grading chart below lists every wrong-count percentage for this quiz length

Expected result: 88% · B+

Use + / − to grade papers quickly.

Grading chart

Score for every number of wrong answers on a 10-question test.

# Wrong# CorrectGrade
1990%
2880%
3770%
4660%
5550%
6440%
7330%
8220%
9110%
1000%

How to grade a test

Score = (correct ÷ total questions) × 100. This grader does that instantly and maps the result to a letter grade.

  1. Set the question count

    Enter how many questions are on the test once — it stays put while you grade a stack.

  2. Mark what’s wrong

    Use + / − on phones, or type the number of wrong answers. On a keyboard, press W to add one wrong.

  3. Use the chart

    The live score panel and grading chart show every possible wrong-count percentage for quick reference.

Frequently asked questions

Tap a question to expand the answer.

How does the grading calculator work?

Enter the total number of questions on the test and how many the student got wrong. The grader instantly calculates the percentage score as (correct ÷ total) × 100, along with the matching letter grade.

Can I grade quickly for a whole stack of tests?

Yes. Set the number of questions once, then use the plus/minus buttons or press W to add a wrong answer and R to reset between papers. The score updates immediately, so grading a class set is fast.

What is the grading chart?

The grading chart lists the resulting percentage for every possible number of wrong answers on your test. It's handy as a quick reference so you don't have to recalculate for each score.

Is anything I enter stored or uploaded?

No. The grading calculator runs entirely in your browser. No scores are sent to a server or saved anywhere online.