What grade is 5 wrong out of 30?

5 wrong answers leaves 25 correct, which is 83.3%. 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 30-question test?

Yes. On a 30-question test, turn on half points in the Quick Grade calculator and a half-credit answer counts as 1.667% instead of 3.333%. The chart on this page uses whole questions only.

30 Questions

30-Question Grading Scale

Each question on a 30-question test is worth 3.33%. On the common 90/80/70/60 scale you can miss up to 3 questions for an A, up to 6 questions for a B, up to 9 questions for a C, up to 12 questions for a D. The chart below shows the percentage and letter grade for every number of wrong answers from 0 to 30.

Custom cutoffs or another test size

Score chart for 30 questions (standard A–F)
Wrong	Correct	Percent	Grade
0	30	100.0%	A
1	29	96.7%	A
2	28	93.3%	A
3	27	90.0%	A
4	26	86.7%	B
5	25	83.3%	B
6	24	80.0%	B
7	23	76.7%	C
8	22	73.3%	C
9	21	70.0%	C
10	20	66.7%	D
11	19	63.3%	D
12	18	60.0%	D
13	17	56.7%	F
14	16	53.3%	F
15	15	50.0%	F
16	14	46.7%	F
17	13	43.3%	F
18	12	40.0%	F
19	11	36.7%	F
20	10	33.3%	F
21	9	30.0%	F
22	8	26.7%	F
23	7	23.3%	F
24	6	20.0%	F
25	5	16.7%	F
26	4	13.3%	F
27	3	10.0%	F
28	2	6.7%	F
29	1	3.3%	F
30	0	0.0%	F

How a 30-question test is scored

Divide the number of correct answers by 30 and multiply by 100. With 30 questions worth the same amount, each one is 3.333% of the grade. With 30 questions each answer is worth only 3.33%, so the grade is steadier than on a short quiz. This size is typical for midterms and multi-section exams.

On the common 90/80/70/60 scale you can miss up to 3 questions for an A, up to 6 questions for a B, up to 9 questions for a C, up to 12 questions for a D. Anything below the D line is an F.

Quick reference for 30 questions

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

0 wrong answers (30 correct) = 100.0%, grade A
1 wrong answer (29 correct) = 96.7%, grade A
2 wrong answers (28 correct) = 93.3%, grade A
3 wrong answers (27 correct) = 90.0%, grade A
6 wrong answers (24 correct) = 80.0%, grade B
9 wrong answers (21 correct) = 70.0%, grade C
12 wrong answers (18 correct) = 60.0%, grade D

Rounding and partial credit on 30 questions

Because 30 does not divide 100 evenly, scores are rounded. For example, 4 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 1.667%.

Worked example: 4 wrong on a 30-question test

A student misses 4 of 30 questions.

Correct answers: 26 of 30
Percentage: 86.7%
Standard A–F: B
Plus/minus: B

(30 − 4) ÷ 30 × 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 ÷ 30 = 3.333% when every question has the same weight. Missing one question leaves 96.67%, and each further miss lowers the score by another 3.333 points.

On a 30-question test with the common 90/80/70/60 scale you can miss up to 3 questions for an A. For the other letters you can miss up to 6 questions for a B, up to 9 questions for a C, up to 12 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!