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Test grade calculator (score and percentage)

Find the percentage and letter grade of a test from the total questions and how many you missed.

Score
85%
Correct17 / 20
Score out of 108.5
Letter grade (A–F)B

The percentage is correct ÷ total × 100. The letter grade uses the common scale: A ≥ 90%, B ≥ 80%, C ≥ 70%, D ≥ 60%, below that F.

Interactive lesson: The math of passing the class Scored 55 on the first exam? Find out what you need next and where the impossible zone starts.

How the calculation works

The percentage score is (correct ÷ total) × 100. On a 20-question test with 3 wrong, that's 17 correct → 85%. For a 0–10 score, divide the percentage by 10.

Examples

  • 17 correct out of 20: 17 ÷ 20 × 100 = 85% (8.5 out of 10).
  • 45 of 60: 75% → 7.5 out of 10.

Frequently asked questions

What if questions have different weights?

Then use the weighted average calculator, which accounts for each question or test weight.

How many correct answers for a target grade?

Multiply total questions by the target as a fraction. For 70% of 40: 0.70 × 40 = 28 correct.

Do blank questions count as wrong?

For the percentage correct, yes — only correct answers count. Tests with negative marking have their own rule.

How do I compute a grade with weighted questions?

Divide points earned by total points available, not the simple share of correct answers.

Should I guess when wrong answers are penalised?

Only if you can eliminate options. With a full penalty on five-option questions, blind guessing has negative expected value.

How should I manage exam time?

Allocate by point value, not question count, and answer what you know first.

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Updated on June 30, 2026 · by Rafael Rossi · Methodology & sources