Test Score Calculator
Percentage, letter grade, and how many you can miss to hit your target
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Quick summary
Enter how many questions you got right and the total to see your percentage and letter grade instantly. Set a target grade and the calculator also tells you the most you can miss and still hit it — handy before an exam. 45 out of 50 is 90%, an A-, and means you could afford to miss 5 to stay at 90%.
Reviewed by Simple Calculators TeamLast reviewed
How to use this calculator
- Enter the inputs requested by the calculator.
- Choose the units or options that match your situation and review the assumptions.
- Run or update the calculation to see the result.
- Review the result, breakdown, and formulas shown on the page.
- Check the inputs, units, dates, and limitations before saving or sharing the result.
Frequently asked questions
How do I calculate a test score percentage?
Divide the number correct by the total number of questions and multiply by 100. 45 correct out of 50 is 45 ÷ 50 × 100 = 90%. This calculator does it instantly and maps the percentage to a letter grade.
What letter grade is my score?
On the common US scale, 90–100 is an A, 80–89 a B, 70–79 a C, 60–69 a D, and below 60 an F, with +/- bands near the edges. The exact cutoffs vary by school and instructor — check your syllabus, since some use a straight scale and others curve.
How many questions can I miss and still get an A?
It depends on the total. To keep 90% on a 50-question test you need 45 right, so you can miss 5. Enter your target grade and the calculator computes the maximum misses for any test length.
Does this handle weighted or partial-credit tests?
This calculator assumes each question is worth the same and is right or wrong. For weighted sections or partial credit, total your earned points and possible points separately, then enter those as 'correct' and 'total' to get the percentage.
Key terms
- Percentage Score
- Correct ÷ total × 100 — the raw grade before any curve.
- Letter Grade
- The A–F band your percentage falls into on the standard scale.
- Grade Curve
- An instructor's adjustment to raw scores; can shift the cutoffs.
Methodology, sources & limitations
This page shows the formula, assumptions, and limitations used for this estimate. Rates, thresholds, and other time-sensitive inputs can change, so verify them against the relevant official source before relying on a result.
For our review approach and the primary sources we consult, see the methodology and source policy. If you spot an outdated figure or formula, please contact us with a correction.