What grade is 3 wrong out of 15?

3 wrong answers leaves 12 correct, which is 80.0%. That is a B on the standard A–F scale and a B- on the plus/minus scale.

Can I give partial credit on a 15-question test?

Yes. On a 15-question test, turn on half points in the Quick Grade calculator and a half-credit answer counts as 3.333% instead of 6.667%. The chart on this page uses whole questions only.

15 Questions

15-Question Grading Scale

Each question on a 15-question test is worth 6.67%. On the common 90/80/70/60 scale you can miss up to 1 question for an A, up to 3 questions for a B, up to 4 questions for a C, up to 6 questions for a D. The chart below shows the percentage and letter grade for every number of wrong answers from 0 to 15.

Custom cutoffs or another test size

Score chart for 15 questions (standard A–F)
Wrong	Correct	Percent	Grade
0	15	100.0%	A
1	14	93.3%	A
2	13	86.7%	B
3	12	80.0%	B
4	11	73.3%	C
5	10	66.7%	D
6	9	60.0%	D
7	8	53.3%	F
8	7	46.7%	F
9	6	40.0%	F
10	5	33.3%	F
11	4	26.7%	F
12	3	20.0%	F
13	2	13.3%	F
14	1	6.7%	F
15	0	0.0%	F

How a 15-question test is scored

Divide the number of correct answers by 15 and multiply by 100. With 15 questions worth the same amount, each one is 6.667% of the grade. A 15-question test is a common size for unit quizzes and chapter tests. One missed question costs 6.67 points, so a single slip rarely decides the letter on its own but two or three often do.

On the common 90/80/70/60 scale you can miss up to 1 question for an A, up to 3 questions for a B, up to 4 questions for a C, up to 6 questions for a D. Anything below the D line is an F.

Quick reference for 15 questions

These scores come from the same chart you see in the tool above.

0 wrong answers (15 correct) = 100.0%, grade A
1 wrong answer (14 correct) = 93.3%, grade A
2 wrong answers (13 correct) = 86.7%, grade B
3 wrong answers (12 correct) = 80.0%, grade B
5 wrong answers (10 correct) = 66.7%, grade D
6 wrong answers (9 correct) = 60.0%, grade D

Rounding and partial credit on 15 questions

Because 15 does not divide 100 evenly, scores are rounded. For example, 2 wrong is 86.6667% exactly and shows as 86.7% rounded to one decimal. The letter is chosen from the rounded value that is displayed.

Half points are possible too: one half-credit answer is worth 3.333%.

Worked example: 2 wrong on a 15-question test

A student misses 2 of 15 questions.

Correct answers: 13 of 15
Percentage: 86.7%
Standard A–F: B
Plus/minus: B

(15 − 2) ÷ 15 × 100 = 86.67%, so the grade is 86.7% (B).

Grading & Weighting FAQs

Grade Calculator & Scoring FAQs

Clear, mathematically verified answers to common questions about weighted grade averages, grading scales, and final exam target scores.

Each question is worth 100 ÷ 15 = 6.667% when every question has the same weight. Missing one question leaves 93.33%, and each further miss lowers the score by another 6.667 points.

On a 15-question test with the common 90/80/70/60 scale you can miss up to 1 question for an A. For the other letters you can miss up to 3 questions for a B, up to 4 questions for a C, up to 6 questions for a D. Your teacher’s scale may use different cutoffs, so check the syllabus.

Interactive Tools Available

Test a hypothetical score with our Target Grade Simulator above!