Test Grade Calculator
Turn correct answers into a percentage and letter grade — with points to the next grade, a what-if table, and a multi-test weighted average. 100% free, runs in your browser.
Grading scale
Custom cutoffs must be strictly descending (A > B > C > D) and each between 1 and 100.
Single test
Correct = total − wrong − blank.
What-if table — correct answers needed per grade
| Grade | Cutoff | Correct needed |
|---|
Multiple tests — weighted average
Weights are relative (they do not need to add to 100). Example: midterm 40, final 60.
Per-test breakdown
| Test | Score | % | Weight |
|---|
How it works
- Percentage = (correct ÷ total) × 100. With wrong/blank mode: correct = total − wrong − blank first.
- Letter grade = the highest cutoff your percentage reaches on the selected scale.
- Points to the next grade = the smallest whole number of additional correct answers that reaches the next cutoff (always rounded up).
- Multi-test average = Σ(percentage × weight) ÷ Σ(weights).
Worked examples
Example 1 — 47 out of 50 (US standard)
Percentage = 47 ÷ 50 × 100 = 94.0% → letter grade A (US standard; also A on the plus-minus scale).
Next grade up is A+ at 97%: 0.97 × 50 = 48.5 → you need 2 more correct answers (49/50) to reach A+.
Example 2 — 23 out of 30, what-if table
Percentage = 23 ÷ 30 × 100 = 76.67% → letter grade C (US standard).
One more correct answer (24/30 = 80%) reaches B. What-if table for 30 questions: A needs 27, B needs 24, C needs 21, D needs 18.
Example 3 — two weighted tests
Midterm: 85/100 (weight 40). Final: 72/80 = 90% (weight 60).
Weighted average = (85 × 40 + 90 × 60) ÷ 100 = 88.0% → B on the US standard scale, B+ on the plus-minus scale (88 ≥ 87).
Example 4 — custom scale (85 / 75 / 65 / 55)
Score: 41/50 → 41 ÷ 50 × 100 = 82.0% → letter grade B (82 ≥ 75, below 85).
Next grade up is A at 85%: 0.85 × 50 = 42.5 → you need 2 more correct answers (43/50) to reach A.
Frequently asked questions
How do you calculate a test grade percentage?
Divide the number of correct answers by the total number of questions, then multiply by 100. For example, 47 correct out of 50 is 47 ÷ 50 × 100 = 94%.
What is the US standard grading scale?
The most common US scale is A: 90–100%, B: 80–89%, C: 70–79%, D: 60–69%, and F: below 60%. This calculator uses it as the default.
How is the plus-minus scale different?
The plus-minus scale splits each letter into three steps: A+ 97–100%, A 93–96%, A− 90–92%, B+ 87–89%, B 83–86%, B− 80–82%, C+ 77–79%, C 73–76%, C− 70–72%, D+ 67–69%, D 63–66%, D− 60–62%, F below 60%. For example, 82% is a B on the standard scale but a B− on the plus-minus scale.
How many questions can I miss and still get an A?
On a 30-question test with the US standard scale you need 27 correct (27 ÷ 30 = 90%) for an A, so you can miss 3. With 26 correct (86.67%) the grade drops to a B. Use the what-if table above for your exact test length.
Do wrong answers and blank answers count the same?
Yes. In the wrong + blank mode, correct answers = total − wrong − blank, so a skipped question costs exactly as much as a wrong one. For example, on a 40-question test with 5 wrong and 2 blank: 40 − 5 − 2 = 33 correct, which is 82.5% — a B.
How is the multi-test weighted average calculated?
Each test's percentage is multiplied by its weight, the results are added, and the sum is divided by the total weight. Example: 85% with weight 40 and 90% with weight 60 gives (85 × 40 + 90 × 60) ÷ 100 = 88%.
Can I use my own grading scale?
Yes — choose Custom and enter your four cutoffs. They must be strictly descending (A > B > C > D) and each between 1 and 100. For example, with cutoffs 85/75/65/55, a score of 41/50 = 82% earns a B, and 2 more correct answers (43/50) reach the A cutoff of 85%.
What is the difference between a test grade calculator and a final grade calculator?
A test grade calculator scores one test from its correct answers. A final grade calculator combines whole categories — tests, quizzes, homework, projects — with different weights into one course grade. For a course average, use our final grade calculator.
Related tools
Letter Grade → GPA converts a letter into grade points; Grade Curve adjusts raw scores before grading; Final Grade Calculator combines whole categories into a course grade.
Free tool by NRTechStudio