Test Grade Calculator
Convert right/wrong answers into a test percentage and letter grade instantly — the teacher's grading shortcut.
Letter mapping uses the most common US scale with ± grades (93–96 A, 90–92 A−, 87–89 B+ …). Districts differ — some use a 7-point scale (93 B+ becomes A−), some skip pluses/minuses entirely. The percentage is universal; remap the letter to your school's published scale if it differs.
Formula
About Test Grade Calculator
The test grade calculator is the digital EZ-Grader: type the number of questions and the number wrong, and it returns the percentage score, the letter grade, the count of correct answers, and how many points each question is worth. Teachers grading a stack of 23-question quizzes, students checking what 4 wrong out of 30 actually means, parents decoding a marked-up worksheet — the math is trivial but doing it sixty times isn't, and odd question counts (17, 23, 31) produce percentages nobody computes in their head. Adjust 'wrong answers' up and down to see the whole grading band for a given test length at a glance.
How to use Test Grade Calculator
- 1Enter your values into Test Grade Calculator — sensible, domain-typical defaults are pre-filled so you see a real result immediately.
- 2The result recomputes live using the formula shown on the page; there is no button to press.
- 3Adjust any input to compare scenarios, then read the worked example to see the substituted numbers.
Why use Test Grade Calculator?
- ✓Computes Test Grade instantly in your browser — no sign-up, no upload, no server round-trip.
- ✓100% free and unlimited, with the exact formula shown: score % = (total − wrong) ÷ total × 100.
- ✓Runs entirely client-side, so every value you enter stays private on your device.
- ✓Live recompute as you type, with a worked example and authoritative references for trust.
Frequently asked questions
How do I calculate a test grade from wrong answers?+
Subtract wrong from total to get correct answers, divide by total, multiply by 100. Three wrong on a 25-question test: (25−3)÷25×100 = 88%, a B+. The per-question value (100÷25 = 4 points each) tells you instantly how much each additional mistake costs.
What letter grade is 80%, 85%, or 88%?+
On the standard US scale: 80–82 is a B−, 83–86 a B, 87–89 a B+. The full scale: A+ 97+, A 93–96, A− 90–92, B+ 87–89, B 83–86, B− 80–82, C+ 77–79, C 73–76, C− 70–72, D+ 67–69, D 63–66, D− 60–62, F below 60. Your district may use different cutoffs.
How many can I get wrong and still get an A?+
You need 90% for an A−, so you can miss 10% of the questions: 2 on a 20-question test, 3 on a 30-question test (just barely — 27/30 = 90.0%), 5 on a 50-question test. For a flat A (93%), the margin shrinks to 1 in 20 or 3 in 50. Set the wrong-answer count and watch the verdict flip.
Does this handle partial credit or weighted questions?+
No — it assumes every question is worth the same. For tests with partial credit, add up the points earned and points possible, then use a percentage calculator (earned ÷ possible × 100) and read the letter from the same scale. For category-weighted exams, use the weighted grade calculator instead.
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