From correct answers to a grade, in one step
A marked test usually comes back as a count — 45 out of 50 — while everything it feeds into speaks percentages and letters: the course grade book, the GPA, the "what did you get?" conversation. This calculator does the translation properly and completely: percentage from correct over total, points earned and possible when questions are worth more than one point each, the number wrong (the figure revision should be organised around), and the letter grade on the standard ten-point scale. It also runs the arithmetic backwards in the table below, showing how many correct answers each letter grade required on a test of this length — the table to glance at before a test, when it can still change how you prepare, rather than only after one. For what a test does to your whole course grade once its weight is applied, continue to the Grade Calculator.
The test score formula
The defaults show the shape of it: 45 correct of 50 is 100 × 45 ÷ 50 = 90.0%, and at one point per question that is 45 of 50 points with 5 wrong — a low A on the ten-point scale, where the bands are A from 90, B from 80, C from 70 and D from 60. Notice how the points-per-question field leaves the percentage untouched: doubling every question's value doubles earned and possible points alike, and the ratio — the thing the letter grade reads — does not move. Points matter for grade books that total points across a course; percentages matter for comparing tests of different lengths.
Why the "needed for each letter" table is the useful part
Percentages hide how coarse a short test is. On a 50-question test each question is worth 2 percent, so the bands fall on whole questions and the table is exact. On a 12-question quiz each question is worth over 8 percent: one careless error can cost a whole letter, 90 percent is literally unreachable (11 of 12 is 91.7, 10 of 12 is 83.3 — there is no score in between), and the "needs at least" figures round up in a way that genuinely matters. The table computes those thresholds honestly with the rounding-up built in: the count shown is the smallest number of correct answers that reaches the band. Teachers know this coarseness well, which is why short quizzes are often weighted lightly or dropped at the end of term — and why a single bad short quiz is rarely the disaster it feels like on the day.
Scales, curves and other honest caveats
The ten-point scale on this page is the most common in US schools, but it is not universal. Some schools and universities shift the bands (an A at 93, a B at 85), some grade on plus/minus refinements, and many instructors curve — adjusting everyone's scores after the fact, which the Grade Calculator's companion curve tool explores in detail. Partial credit breaks the clean correct/total model too: an essay or a worked-problem test awards fractions of questions, in which case enter points earned and possible directly into a weighted calculation rather than forcing a question count. Use this page for the fast, exact translation of a clean objective score, and your syllabus for the local rules that turn scores into official grades.
Worked example
You answered 45 of 50 questions correctly at 1 point each. Percentage = 100 × 45 ÷ 50 = 90.0%. Points earned = 45 × 1 = 45 of a possible 50, with 5 wrong. On the ten-point scale 90.0% is the first value of an A — one fewer correct answer (44 of 50, 88%) would have been a B, which the thresholds table under the calculator makes visible at a glance.
How to use this calculator
- Count the questions you answered correctly and enter that number.
- Enter the total number of questions on the test.
- Enter the points per question — leave it at 1 if questions are worth a point each.
- Read your percentage and letter grade in the headline panel, with points earned and questions wrong in the stats.
- Check the thresholds table to see how many correct answers each letter grade needed on a test of this length.
What one test does to your course grade
On its own, a test score is just a number; its real weight comes from the syllabus. A 90 on a test worth 10 percent of the course banks 9 course points, while the same 90 on a final worth 40 percent banks 36 — which is why the sensible follow-up to any score is the weighted view. Enter this percentage as one category in the Weighted Grade Calculator, or use the Grade Calculator to ask the forward-looking question — what the tests still to come need to average for the course grade you want. Judged in that frame, most single scores shrink to their proper size: informative, worth learning from, and very rarely decisive on their own.
And do spend one minute on the wrong answers themselves. Five wrong on a fifty-question test is a small, specific list, and sorting it — concept never learned, concept misapplied, or plain slip — tells you exactly what the next study session is for. That diagnostic habit, repeated after every test, is worth more over a course than any single score on this page.