Test Score Calculator
Turn correct answers or earned points into a percentage and letter grade instantly — plus find out exactly how many questions you can miss and still hit the grade you’re aiming for.
Your test score percentage = (points earned ÷ total points possible) × 100. If you’re working from wrong answers instead of points, correct answers = total questions − wrong answers, then divide by the total. Use the mode toggle below to switch between the two, and the “desired grade” tool to see the maximum number of questions you can afford to miss.
Enter your test results
Enter your results above to see exactly how much each question is worth and how much room you have before your grade drops a letter.
How to Calculate a Test Score Percentage
Every test score percentage comes down to one formula, whether you’re grading a 10-question pop quiz or a 100-point final:
If you’re working from a count of correct or wrong answers rather than points, correct answers equal total questions minus wrong answers — this calculator’s Questions Mode does that subtraction for you automatically, including any bonus or extra-credit questions you got right.
Questions Mode vs. Points Mode: Which Should You Use?
Questions Mode is built for tests where every question is worth the same amount — multiple choice, true/false, fill-in-the-blank quizzes — so all you need is the total question count and how many you missed. Points Mode is built for exams with uneven weighting: a math test where some problems are worth 5 points and others 10, an essay exam graded out of 100 with partial credit, or any assignment where “questions” isn’t really the right unit. If your teacher hands back a raw score like “43/50” rather than “missed 7 questions,” Points Mode is almost always the more accurate choice.
Worked Example
Questions Mode
A 25-question quiz, missed 3 questions, no bonus.
Points Mode
A 50-point exam, earned 43 points, plus 2 bonus points.
How Many Questions Can I Get Wrong and Still Pass?
This is the question this calculator is really built to answer. Pick a target grade in the “How many can I miss for a…” selector above, and the tool works backward from the percentage threshold for that grade to tell you the maximum number of wrong answers you can afford. The math behind it: for a target percentage T on a test with N total questions, the minimum correct answers needed is N × T (rounded up), and everything beyond that is how many you’re allowed to miss.
On a 25-question test, hitting a B (80%) requires at least 20 correct — meaning you can afford to miss up to 5 and still land the grade. Change the total question count or the target grade above and the “can still miss” figure in the results panel updates immediately.
Test Score Breakdown Table
Below is every possible wrong-answer count for your current total questions, along with the resulting percentage and letter grade — the row matching your current input is highlighted. Teachers grading a stack of similar-length tests can use this as a lookup reference instead of recalculating each paper by hand.
| Wrong | Correct | Percentage | Grade |
|---|
Simple Scale vs. Extended Scale — Which Does Your School Use?
The Simple scale groups everything into five bands: A (90%+), B (80–89%), C (70–79%), D (60–69%), and F (below 60%) — common in elementary and middle school. The Extended scale adds plus/minus modifiers (A-, B+, B-, and so on), which is the standard in most high schools and colleges and gives a finer-grained letter grade for the exact same percentage. Toggle between the two above; your percentage doesn’t change, only how it’s translated into a letter.
What Counts as a Passing Score?
60% is the most common passing threshold in U.S. schools, but it isn’t universal — some districts set the bar at 65% or 70%, and many standardized or certification exams use a completely different cutoff unrelated to the 60/70/80/90 letter-grade bands (a driving test or professional licensing exam might require 80% or higher just to pass, with no partial letter grades at all). Always confirm your specific passing threshold rather than assuming 60%, and adjust the “Passing threshold” field above so the pass/fail badge reflects your actual course policy.
Common Mistakes When Calculating a Test Score
- Confusing a percentage with a percentile. A percentage tells you how many questions you got right out of the total. A percentile compares your score to everyone else who took the test — an 85% test score is not the same thing as being in the 85th percentile.
- Adding bonus points before checking the denominator. Extra credit should raise your points-earned total, not your total-points-possible — mixing that up understates your score.
- Assuming every question is worth the same amount. On exams with mixed point values, use Points Mode instead of counting wrong answers, since a “missed question” worth 10 points hurts far more than one worth 2.
- Rounding inconsistently. Some teachers round 89.5% up to a 90%, others don’t round at all — check your syllabus if you’re right on a letter-grade boundary.
- Forgetting that this test might not be your whole grade. A single test score rarely equals your course grade on its own — it usually feeds into a larger weighted average alongside other assignments and exams.
Turning a Test Score Into Your Overall Grade
A single test percentage is only one input into your bigger academic picture. If this test is one of several grading categories in a course, our Grade Calculator combines multiple weighted categories into a current class grade. If it’s specifically a quarter or final-exam score feeding into a semester total, the Semester Grade Calculator handles that weighting and can even reverse-solve for the final exam score you need. And once your course grade is finalized, run it through the GPA Calculator to see how it affects your overall GPA.
Frequently Asked Questions
Divide the points you earned (or correct answers) by the total points possible (or total questions), then multiply by 100. A 43 out of 50 is 86%.
It depends on the total number of questions. Enter your test length above and select “B (80%)” in the desired-grade selector to see the exact maximum number of wrong answers allowed for your specific test.
A percentage measures how many questions you answered correctly out of the total. A percentile measures how your score compares to other test-takers. An 85% score and an 85th percentile are unrelated numbers that happen to look similar.
Typically, bonus points are added to your points-earned total while the total-points-possible stays the same, which can push your percentage above 100%. This calculator’s bonus fields work exactly that way.
Use Points Mode instead of Questions Mode — it accepts decimal values, so half-point and quarter-point scoring calculates correctly.
On the Simple A–F scale, 70% is a flat C. On the Extended +/− scale, 70% typically falls at the bottom of the C- range, since C- usually starts around 70%. Toggle between the two scales above to see both.
Add up the points you earned across all questions and divide by the total points possible for the whole test — that’s exactly what Points Mode does, rather than treating every question as equally weighted.
Related Calculators
Take your results further with these companion tools.
Methodology: This calculator uses the standard percentage formula (points or correct answers divided by the total, multiplied by 100) and standard 10-point Simple and Extended letter-grade bands. Passing thresholds, rounding policies, and grade-boundary rules vary by school and instructor — always confirm your official score against your teacher’s syllabus or grading policy. Last reviewed for the 2026 academic year.