Test Score Calculator

Turn the number of wrong answers into a percentage score and letter grade, with a grading table for teachers.

Total questions	40
Wrong answers	6

Total questions

Wrong answers

Score

85%

34 out of 40 correct: a B on the standard US scale.

34 of 40 correct

85 points scored in every 100

Grading table

Wrong	Correct	Score	Grade
0	40	100%	A+
1	39	97.5%	A+
2	38	95%	A
3	37	92.5%	A-
4	36	90%	A-
5	35	87.5%	B+
6	34	85%	B
7	33	82.5%	B-
8	32	80%	B-
9	31	77.5%	C+
10	30	75%	C
11	29	72.5%	C-
12	28	70%	C-
13	27	67.5%	D+
14	26	65%	D
15	25	62.5%	F

About the Test Score Calculator

Enter the number of questions and how many were wrong. The calculator gives the percentage score and letter grade, plus a table showing the score and grade for every number wrong, which teachers can use to mark a stack of papers quickly.

A test score is simply the share of questions answered correctly.

The formula

Score = (total − wrong) ÷ total × 100

Worked example

A 40-question test with 6 wrong

Correct: 40 − 6 = 34
Score = 34 ÷ 40 = 85%
A B on the standard US scale

Questions people ask

How are letter grades set?

This uses the common US scale (A 93+, A− 90+, B+ 87+…). Your school may use different cut-offs.

What about partial credit?

Enter the points lost instead of questions wrong, and total points instead of questions.

How many can I get wrong and still get 90%?

10% of the questions: 4 out of 40. The table shows every cut-off.