Test Score Percentage Calculator
Convert a raw test score (correct answers out of total) into a percentage. The standard summary statistic every teacher, student, and exam system uses to express performance on a fixed-question test.
Last updated: May 2026
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About this calculator
The formula is score % = (correct / total) × 100, where correct is the number of correct answers and total is the total number of questions on the test. The result is a percentage from 0 to 100 (or higher if partial-credit or bonus questions are allowed). This simple ratio assumes every question is worth equal weight; for weighted tests (where some questions are worth more than others), use a weighted-grade calculator that takes point values per question rather than just counts. Variables: correct = number right; total = number of questions attempted (or assigned). Edge cases: total = 0 makes the formula undefined (divide by zero). For tests with negative marking (some standardised exams subtract a fraction of a point for wrong answers), use the official scoring rubric rather than the simple percentage. For multiple-choice tests with random guessing, the expected score from pure guessing on a 4-option test is 25% (not 0%) — chance-corrected scoring formulas adjust for this floor. For tests scaled to a different range (a 1–10 score, a 0–800 SAT score), apply the appropriate scale transformation after computing the raw percentage. Letter-grade conversions vary by institution: typical US scales give A = 90–100, B = 80–89, C = 70–79, D = 60–69, F < 60, but many systems use stricter thresholds (A = 93+) or more granular grades (A−, B+).
How to use
Example 1 — Standard multiple-choice test. A student got 38 out of 50 questions correct. Enter correctAnswers = 38, totalQuestions = 50. Score % = (38 / 50) × 100 = 0.76 × 100 = 76%. ✓ On a typical US 10-point scale that's a C (70–79); on a UK degree classification it would be roughly an upper second (60–69 = 2:1, 70+ = 1st), depending on the institution. Example 2 — Quiz with all questions counted. A 25-question pop quiz; the student got 22 right. Enter 22 and 25. Score = (22/25) × 100 = 88%. ✓ Verify: 22/25 = 0.88, and × 100 = 88, which is a B+ on a 10-point letter grade scale. If the quiz had partial credit (e.g., the student got 21 fully right plus 2 questions half-correct = 22 total points), the calculation is the same — just use the points total instead of the count.
Frequently asked questions
How is test percentage calculated when questions have different point values?
When questions are weighted, the calculation becomes points-earned ÷ total-points-possible × 100, not just count ÷ total. For a test with 5 questions worth 10 points each and 1 essay worth 50 points (total = 100 points), getting all 5 short questions right and half the essay = (50 + 25) / 100 = 75%, not 5/6 = 83%. This calculator handles only the equal-weight case where each question contributes the same; for weighted tests, sum the points earned and divide by the total points available. Most weighted tests provide a points-per-question breakdown on the cover sheet or in the syllabus — use those numbers, not the count of questions. Confusing count with points is one of the most common errors when interpreting test scores.
What does my percentage score mean as a letter grade?
Letter-grade thresholds vary significantly by country and institution. The US 10-point scale gives A = 90–100, B = 80–89, C = 70–79, D = 60–69, F < 60, with pluses and minuses at every 3–4 percentage points. Many US private schools and graduate programs use stricter scales — A = 93+, A− = 90–92, B+ = 87–89, etc. UK degree classifications use a different system entirely: 70+ is a first-class degree, 60–69 upper second (2:1), 50–59 lower second (2:2), 40–49 third class, below 40 fail. Continental European universities often use 1–10 or 1–20 scales with passing marks at 6/10 or 10/20. For high-stakes contexts, always check your institution's specific rubric; assuming the US 90/80/70 standard in a UK or European setting can misread a perfectly good result as failing.
Should I count unanswered questions or only ones I attempted?
Most standardised tests count all assigned questions in the denominator regardless of whether you attempted them — an unanswered question counts as wrong. This is the standard convention for SATs, GRE, TOEFL, and most classroom tests. Some exams with negative marking (older versions of SAT, certain national entrance exams) penalise wrong answers but not omissions, making strategic skipping rational. A few tests use 'completion-only' scoring where only attempted questions count, but this is rare and always explicitly stated. When in doubt, check the test's scoring rubric on its cover sheet. This calculator assumes the standard 'all-questions-count' convention; for completion-only scoring, divide your correct answers by the number you actually attempted instead of the total.
What are the most common mistakes people make with test percentages?
The first is confusing count of correct answers with points earned on a weighted test — equal weighting is the exception, not the rule, in modern grading. The second is forgetting bonus questions, which can push the score above 100% legitimately. The third is rounding intermediate values; compute (correct / total) × 100 once at the end, not by rounding the ratio first. The fourth is comparing scores across tests of different difficulty or different lengths without normalising; a 75% on a hard test may represent better performance than 90% on an easy one. The fifth is treating percentage as the only signal of performance; standardised tests provide percentile ranks (where you stand vs other test-takers) that often matter more than raw percentage for admissions decisions. The sixth is using letter-grade boundaries from one school in another; A vs B at one institution might be A− vs B+ at another. And the seventh is ignoring partial credit when reviewing your own performance; learning where you got partial credit reveals what concepts you almost got but missed in the details.
When should I not use this calculator?
Skip it for weighted tests where questions carry different point values — use a weighted-points calculator that takes the per-question point breakdown. Avoid it for exams with negative marking (penalty for wrong answers) where simple correct/total ratio overstates your true score; use the official scoring formula. It is the wrong tool for criterion-referenced grading where you need to meet specific competency thresholds rather than score above a percentage line. Do not use it for percentile ranking on standardised tests — your raw percentage tells you nothing about how you compare to other test-takers, which is what college admissions and professional certification actually use. Skip it for placement tests where the score determines course level but isn't translated to a grade. And for grade calculations across multiple assignments and exams with different weights, use a full gradebook calculator that handles weighted averages across an entire course.