EZ Grader — Test Score Calculator

How to use the EZ grader

Enter the number of questions or points the test is out of, then the number wrong. The big number is the percentage score — the share answered correctly — and just below it is the matching letter grade. Everything updates instantly as you type; there's no button to press and nothing is uploaded.

Worked example. A 25-question quiz with 4 wrong: enter 25 and 4. The score is (25 − 4) ÷ 25 × 100 = 84.0%, a B on the standard scale. Change the number wrong and watch the score and grade move in real time — handy when you're marking a stack of papers and just need the next result.

The real time-saver is the printable grade chart. It lists a row for every possible number of wrong answers, from a perfect score down to all wrong, with the percentage and letter grade for each. Print it once and you can grade the whole class by reading down a single column — no math per paper. Use Print chart for a clean printout, or Copy chart to paste it into a spreadsheet or gradebook.

Everything runs in your browser — the numbers you type are never uploaded. Scores are rounded to one decimal place; round to your school's policy if it differs.

Percentage scores and letter grades explained

A percentage score answers one question: out of everything that could have been right, how much was? That's why it's number correct ÷ total, not wrong ÷ total. A test out of 50 points with 10 points lost is 40 ÷ 50 = 80%, regardless of how many separate questions those points came from — which is why this grader works equally well for question counts and point totals.

The standard A–F scale used by default is the most common in U.S. schools: 90 and up is an A, then B, C and D in ten-point bands down to 60, and anything below 60 is an F. Switch on the plus/minus scale for finer distinctions — A+ at 97, A at 93, A− at 90, and matching plus/minus bands all the way down. Grading scales vary by school and even by teacher, so treat the letter as a guide and apply your own cut-offs where they differ; the percentage itself is exact either way.

Rounding matters near a boundary. A raw 89.6% rounds to 89.6 here and still lands as a B on the standard scale, but a student sitting at 89.5 is one rounding rule away from an A−. This tool always shows the precise percentage to one decimal so you can see exactly where a score falls before applying any rounding-up policy of your own.

Need a final course grade rather than a single test? Use the GPA calculator to weight letter grades across courses, the percentage calculator for any other percent-of-total sum, or the average calculator to average several test scores together.

Common grading questions

How do you calculate a test grade? Subtract the number wrong from the total, divide by the total, and multiply by 100. A 20-question test with 3 wrong is (20 − 3) ÷ 20 × 100 = 85%.

What is 85% as a letter grade? 85% is a B on the standard scale (80–89% is a B). On the plus/minus scale it's a B as well, since 83–86% falls in the plain-B band.

Can I grade by points instead of questions? Yes. Put the total points possible in the first box and the points lost in the second — the percentage and letter grade are calculated the same way.

What's the printable chart for? It shows the score and grade for every possible number of wrong answers, so you can grade an entire class by reading one column instead of doing the math on each paper.

Is the EZ grader free and private? Yes — it's free, needs no signup, and runs entirely in your browser. Nothing you type is uploaded or stored.