Test Grade Calculator
Enter how many questions or points a test has and how many were wrong. You get the percentage and letter grade, plus a grading chart for every score that you can print.
How a test score is calculated
Subtract the number wrong from the total to get the number right, then divide by the total and multiply by 100. With 3 wrong out of 20: (20 − 3) ÷ 20 × 100 = 85%, a B on a common US scale. Each question on that test is worth 100 ÷ 20 = 5 percentage points.
The same works for points. A test out of 50 points where you lost 6 is (50 − 6) ÷ 50 × 100 = 88%.
| Questions | Each question | Score with 3 wrong |
|---|---|---|
| 10 | 10% | 70% (C-) |
| 20 | 5% | 85% (B) |
| 25 | 4% | 88% (B+) |
| 40 | 2.5% | 92.5% (A-) |
| 50 | 2% | 94% (A) |
Letter grades use a common US plus and minus scale, A from 93%, A- from 90%, B+ from 87% and so on, or a simple one where A starts at 90%, B at 80%, C at 70% and D at 60%. Schools and teachers set their own cutoffs, so check yours.
Grading a stack of tests
The grading chart lists the score for every possible number wrong, so you can grade a whole class without recalculating: find the number wrong and read across. Tick Half points if your tests give half credit, and print the chart to keep it next to your marking.
To combine test scores with homework and quizzes into a course grade, use the grade calculator. To see what you need on a final, use the final grade calculator.