Test Score Calculator (Percentage and Letter Grade)
Enter the points or questions you got right and the total to get your percentage and grade.
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Test Score Calculator (Percentage and Letter Grade) by TheCalcTools
How the Test Score Calculator (Percentage and Letter Grade) works
Percentage = correct ÷ total × 100. Each question is worth 100 ÷ total percentage points, so on a 50-question test each question is worth 2%.
Letter grades here use the common US scale (A from 90%, B from 80%, C from 70%, D from 60%) and the College Board plus/minus table. Your teacher’s scale may differ.
The formula
Worked example
Using the default values shown in the calculator:
| Points or questions correct | 42 |
|---|---|
| Total points or questions | 50 |
- 42 out of 50 = 84.0%, grade B.
- You missed 8 points; an A needs 45.
Result:
| Score | 84.0% |
|---|---|
| Letter grade (A 90, B 80, C 70, D 60) | B |
| With plus and minus | B |
| Points missed | 8.0 |
| Points needed for an A (90%) | 45.0 |
Frequently asked questions
What is 42 out of 50?
84%, a B on the usual scale (B on the plus/minus scale too).
How many can I miss and still get an A?
On a 50-point test, 90% is 45 points, so you can miss 5.
Sources and further reading
- College Board BigFuture: How to convert your GPA to a 4.0 scale
- Wikipedia: Academic grading in the United States
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.