Grade Calculator
Enter points earned and points possible — or just how many questions you missed — to get your test percentage and letter grade on the standard A+ to F scale.
Example: with How do you want to enter it? Points earned ÷ points possible · Points earned (or questions correct) 17 · Points possible 20 · Questions wrong (wrong-answers mode) 3 · Total questions (wrong-answers mode) 20 → Grade: 85% (B).
Computed by the calculator below using its default values. Change any input to see your own numbers.
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Check it outHow to calculate a test grade
Grade percentage = points earned ÷ points possible × 100. Score 17 out of 20 and you get 17 ÷ 20 = 0.85, or 85% — a solid B. Grading from wrong answers is the same math after one subtraction: miss 3 of 25 questions and you answered 22 right, so 22 ÷ 25 = 88%, a B+. When questions carry different point values, grade from points earned, not question counts.
Standard letter grade scale
Most US schools map percentages to letters in these bands:
- A+ 97–100 · 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
Scales do vary — some schools start the A at 90 or pass at 65 — so check the syllabus when a grade lands on a boundary.
How it’s calculated
Percentage = points earned ÷ points possible × 100. In wrong-answers mode, points earned = total questions − questions wrong, with every question weighted equally. Letters use the common US band scale: A+ 97–100, 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 school’s scale may differ.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Counting questions instead of points when questions are weighted differently — a missed 10-point essay hurts far more than a missed 1-point multiple choice.
- Rounding before assigning the letter — 89.5% is usually recorded as a B+, not an A−, unless your teacher rounds up.
- Mixing modes — in wrong-answers mode enter the number you missed, not the number you got right.
Frequently asked questions
What grade is a 15 out of 20?
15 ÷ 20 = 75%, a C on the standard scale. One more point (16/20 = 80%) moves you up to a B−.
What grade is 3 wrong out of 25?
Three wrong means 22 correct: 22 ÷ 25 = 88%, a B+.
Is a 93 an A or an A−?
On the most common scale, 93–96 is an A and 90–92 is an A−, so a 93 just makes the A. Schools using whole-letter grades often start the A at 90 instead.
What percentage is a passing grade?
Commonly 60% (a D−), though many colleges require a C in major courses and some districts set passing at 65%. The syllabus is the final word.
How do I calculate my grade with extra credit?
Add extra-credit points to points earned but not to points possible: 92 + 5 = 97 out of 100 is 97%, an A+.