Calculate the percentage score of your grade from the marks you obtained out of the total possible marks, with an equivalent letter grade.
📂 EducationFill in the fields on the left, then press the button to see your result instantly. Everything runs locally in your browser — no sign-up required, and no data is ever sent anywhere.
The grade percentage calculation converts any score expressed as marks out of a total (such as 78 out of 100, or 34 out of 40) into a standardized percentage, making it easy to compare results across assignments, exams, or courses that use different total mark values. The formula itself is simple: divide the marks obtained by the total possible marks, then multiply by 100. This tool also maps the resulting percentage to an approximate letter grade using a common U.S.-style grading scale, though the exact percentage boundaries for each letter grade can vary between individual institutions and courses. Converting raw marks to a percentage before comparing scores is standard academic practice worldwide precisely because it removes the total-marks variable, letting a 34/40 result and a 78/100 result be compared on the same 0-100 scale despite having different denominators. This same percentage-based approach underlies most grade-point and letter-grade systems used by schools and universities internationally, since converting to a common 0-100 scale first is what makes it possible to apply one consistent set of letter-grade boundaries across assessments of very different sizes and formats.
Report cards, exam papers, and online gradebooks rarely use the same total marks twice. One quiz might be scored out of 20, a midterm out of 75, and a final exam out of 150. Comparing "34 out of 40" directly to "78 out of 100" tells you very little at a glance — but converting both to percentages instantly makes them comparable, which is exactly the problem a grade percentage calculator solves.
The formula could not be simpler: take the marks you obtained, divide by the total possible marks, and multiply by 100. A score of 34 out of 40 becomes 85%; a score of 78 out of 100 stays 78%. Despite the near-trivial arithmetic, this single conversion is what allows a teacher, a student, or an admissions office to place wildly different assessments — a 10-point pop quiz and a 200-point final project — onto one consistent 0-100 scale for direct comparison.
Once you have a percentage, the natural next question is what letter grade it corresponds to. This is where things get less standardized: letter-grade boundaries are set by individual institutions, and they vary meaningfully. Some schools consider 90% and above an A-, others reserve A- for 90-92% specifically and A for 93% and above; some use plus/minus grades at all, others use only whole letters. This tool applies one commonly used general-purpose U.S.-style scale purely as a reference point — it is not a universal standard, and your own institution's official syllabus or grading policy always takes precedence over any general-purpose scale shown here.
A less obvious use case is checking your own math on a graded paper. Occasionally a grade percentage printed on an assignment does not match what dividing the marked score by the total possible marks would actually produce — usually a simple arithmetic slip during grading. Recalculating the percentage yourself from the raw marks is a quick, useful way to catch this kind of error before raising it with an instructor.
Finally, if an assignment awarded bonus points beyond the normal maximum, the underlying division can mathematically produce a result above 100%. Whether that actually counts toward your grade above the normal ceiling, gets capped at 100%, or is handled some other way is entirely a matter of institutional policy rather than mathematics — so treat any above-100% result here as the literal arithmetic outcome, and confirm with your instructor how bonus points are actually applied to your final grade.
Letter grade boundaries (the percentage cutoff for an A, B, C, etc.) vary between schools, countries, and even individual courses — this tool uses a common general-purpose scale, so always check your own institution's official grading scale for exact boundaries.
Yes — enter the actual total possible marks for that specific assessment (such as 40, 60, or 150), and the tool will correctly calculate the equivalent percentage regardless of the total.
The calculator will still compute a percentage above 100% mathematically, though how bonus points affect your official final grade depends entirely on your institution's specific grading policy.