What grade is 15 wrong out of 100?

15 wrong answers leaves 85 correct, which is 85.0%. 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 100-question test?

Yes. On a 100-question test, turn on half points in the Quick Grade calculator and a half-credit answer counts as 0.5% instead of 1%. The chart on this page uses whole questions only.

100 Questions

100-Question Grading Scale

Each question on a 100-question test is worth 1%. On the common 90/80/70/60 scale you can miss up to 10 questions for an A, up to 20 questions for a B, up to 30 questions for a C, up to 40 questions for a D. The chart below shows the percentage and letter grade for every number of wrong answers from 0 to 100.

Custom cutoffs or another test size

Score chart for 100 questions (standard A–F)
Wrong	Correct	Percent	Grade
0	100	100.0%	A
1	99	99.0%	A
2	98	98.0%	A
3	97	97.0%	A
4	96	96.0%	A
5	95	95.0%	A
6	94	94.0%	A
7	93	93.0%	A
8	92	92.0%	A
9	91	91.0%	A
10	90	90.0%	A
11	89	89.0%	B
12	88	88.0%	B
13	87	87.0%	B
14	86	86.0%	B
15	85	85.0%	B
16	84	84.0%	B
17	83	83.0%	B
18	82	82.0%	B
19	81	81.0%	B
20	80	80.0%	B
21	79	79.0%	C
22	78	78.0%	C
23	77	77.0%	C
24	76	76.0%	C
25	75	75.0%	C
26	74	74.0%	C
27	73	73.0%	C
28	72	72.0%	C
29	71	71.0%	C
30	70	70.0%	C
31	69	69.0%	D
32	68	68.0%	D
33	67	67.0%	D
34	66	66.0%	D
35	65	65.0%	D
36	64	64.0%	D
37	63	63.0%	D
38	62	62.0%	D
39	61	61.0%	D
40	60	60.0%	D
41	59	59.0%	F
42	58	58.0%	F
43	57	57.0%	F
44	56	56.0%	F
45	55	55.0%	F
46	54	54.0%	F
47	53	53.0%	F
48	52	52.0%	F
49	51	51.0%	F
50	50	50.0%	F
51	49	49.0%	F
52	48	48.0%	F
53	47	47.0%	F
54	46	46.0%	F
55	45	45.0%	F
56	44	44.0%	F
57	43	43.0%	F
58	42	42.0%	F
59	41	41.0%	F
60	40	40.0%	F
61	39	39.0%	F
62	38	38.0%	F
63	37	37.0%	F
64	36	36.0%	F
65	35	35.0%	F
66	34	34.0%	F
67	33	33.0%	F
68	32	32.0%	F
69	31	31.0%	F
70	30	30.0%	F
71	29	29.0%	F
72	28	28.0%	F
73	27	27.0%	F
74	26	26.0%	F
75	25	25.0%	F
76	24	24.0%	F
77	23	23.0%	F
78	22	22.0%	F
79	21	21.0%	F
80	20	20.0%	F
81	19	19.0%	F
82	18	18.0%	F
83	17	17.0%	F
84	16	16.0%	F
85	15	15.0%	F
86	14	14.0%	F
87	13	13.0%	F
88	12	12.0%	F
89	11	11.0%	F
90	10	10.0%	F
91	9	9.0%	F
92	8	8.0%	F
93	7	7.0%	F
94	6	6.0%	F
95	5	5.0%	F
96	4	4.0%	F
97	3	3.0%	F
98	2	2.0%	F
99	1	1.0%	F
100	0	0.0%	F

How a 100-question test is scored

Divide the number of correct answers by 100 and multiply by 100. With 100 questions worth the same amount, each one is 1% of the grade. A 100-question exam spreads the risk thinly: each answer is worth just 1%, so you can miss several questions before the letter grade moves.

On the common 90/80/70/60 scale you can miss up to 10 questions for an A, up to 20 questions for a B, up to 30 questions for a C, up to 40 questions for a D. Anything below the D line is an F.

Quick reference for 100 questions

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

0 wrong answers (100 correct) = 100.0%, grade A
1 wrong answer (99 correct) = 99.0%, grade A
2 wrong answers (98 correct) = 98.0%, grade A
3 wrong answers (97 correct) = 97.0%, grade A
10 wrong answers (90 correct) = 90.0%, grade A
20 wrong answers (80 correct) = 80.0%, grade B
30 wrong answers (70 correct) = 70.0%, grade C
40 wrong answers (60 correct) = 60.0%, grade D

Rounding and partial credit on 100 questions

Because 100 divides 100 evenly, every score is a whole percentage: no rounding is needed.

Half points are possible too: one half-credit answer is worth 0.5%.

Worked example: 12 wrong on a 100-question test

A student misses 12 of 100 questions.

Correct answers: 88 of 100
Percentage: 88.0%
Standard A–F: B
Plus/minus: B+

(100 − 12) ÷ 100 × 100 = 88%, so the grade is 88.0% (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 ÷ 100 = 1% when every question has the same weight. Missing one question leaves 99%, and each further miss lowers the score by another 1 points.

On a 100-question test with the common 90/80/70/60 scale you can miss up to 10 questions for an A. For the other letters you can miss up to 20 questions for a B, up to 30 questions for a C, up to 40 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!