ExamTally → Test Grade Calculator
Test Grade Calculator
Enter the number of questions and how many you got right — ExamTally stamps the percentage and letter grade, with a grading chart for every score.
To grade a test, divide the number correct by the total questions and multiply by 100. 18 correct out of 20 is 18 ÷ 20 × 100 = 90%, an A on the standard scale. If each question is worth more than one point, the percentage is the same — points earned over points possible. Enter your own numbers below.
Grading chart — by number correct
| Correct | Score | Letter |
|---|
Key takeaways
- Score = correct ÷ total × 100. Points per question cancel out.
- 20 questions, 18 correct → 90% → A.
- Uneven point values? Use earned ÷ possible — the same formula.
- Letters use the default US scale (A 90+, B 80+, C 70+, D 60+, F < 60).
- Confirm your school's cutoffs — pluses, minuses, and curves vary.
How the test grade calculator works
A test grade is the share of points you earned out of the points available, written as a percentage. When every question is worth one point, that is simply the number correct divided by the total number of questions. When questions are worth more, multiply both sides by the points per question — the ratio, and therefore the percentage, does not change.
Because the points-per-question value appears in both the top and bottom of the fraction, it cancels out. That is why a 20-question test scored at one point each and the same test scored at five points each both give the same percentage.
Worked example: 20 questions, 18 correct
Start with 20 questions and 18 correct. The score is 18 ÷ 20 = 0.90, and 0.90 × 100 = 90%. On the standard scale, 90% is the bottom of the A band, so the stamped grade is an A. Miss one more (17 correct) and the score drops to 85% — a B.
Standard A–F grading scale
| Letter | Percentage | GPA points (4.0) |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89% | 3.0 |
| C | 70–79% | 2.0 |
| D | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
This is the most common US scale. Your school may use plus/minus grades or different cutoffs — always confirm.
Need to combine several tests? Roll them together with the average grade calculator, weight them by category with the weighted grade calculator, or check a single assignment with the percentage grade calculator.
Frequently asked questions
How do you calculate a test grade?
Divide the number of correct answers by the total number of questions, then multiply by 100 to get a percentage. For example, 18 correct out of 20 is 18 ÷ 20 × 100 = 90%, an A on the standard scale. If questions are worth different points, divide points earned by total points instead.
What if every question is worth more than one point?
Enter the points per question and the calculator multiplies it through automatically. The percentage is still correct ÷ total, because both the numerator and denominator scale by the same points-per-question value, so the result is identical to a one-point test.
What letter grade is each percentage?
On the default US scale: A is 90–100%, B is 80–89%, C is 70–79%, D is 60–69%, and F is below 60%. Many schools add pluses and minuses or shift the cutoffs, so confirm your class’s scale before relying on the letter.
What grade is 18 out of 25?
18 correct out of 25 is 18 ÷ 25 = 0.72, or 72% — a C on the standard scale. Enter 25 questions and 18 correct above to see it stamped, and the chart lists the score for every number correct.
How is the score rounded?
The percentage is rounded to one decimal place, and whole-number results show without a decimal. For example 18 ÷ 20 is exactly 90%, while 19 ÷ 24 shows as 79.2%. Your teacher may round differently, so treat borderline grades as estimates.
Does this work for quizzes and exams too?
Yes. A 10-item quiz, a 50-question midterm, or a 200-point final all use the same maths — the share of points earned out of points possible. Set the points per question to match how your test is weighted.
The grade calculation is mathematical: score equals points earned divided by points possible, times 100. Letter-grade bands use the common US scale (A 90+, B 80+, C 70+, D 60+, F below 60); individual schools and districts set their own cutoffs, pluses/minuses, and rounding rules.
Last reviewed 2026-06-28