How to use the percentage to letter grade calculator
Letter grades come from which band a percentage falls into, not from where you rank against classmates. Type one course per line as Course, percentage and you get the letter for every course plus the shape of the whole report card: how many A grades, what the average percentage is, and which letter that average itself lands on.
The cutoffs are inputs rather than fixed numbers. The 90, 80, 70 and 60 scale is prefilled because it is the most common one in U.S. high schools, but a good number of schools use 93 for an A, some departments grade on a different scale entirely, and individual syllabi override both. Replace the four values with the ones your teacher published. The cutoffs have to decrease in order, and a scale that does not is rejected with a message instead of a silent wrong answer.
Every boundary is read as at or above. With the default scale exactly 90 percent is an A and 89.9 percent is a B. The table prints the cutoff that was applied to each course, so a grade sitting right on a boundary is easy to check rather than something you have to trust.
Plus and minus grades are not supported: only A, B, C, D and F. Credit weighting is not applied either, so a one-credit elective counts the same as a four-credit science course in the distribution above. Percentages may include decimals and must fall between 0 and 100.
Frequently asked questions
Yes. The lower bound for A, B, C and D are all inputs. The common 90, 80, 70 and 60 scale is prefilled, but plenty of schools and individual teachers use a different scale, so replace the values with the ones on your own syllabus.
An A. Each cutoff is treated as at or above, so 90 is an A and 89.9 is a B with the default scale. The table shows which cutoff was applied to every course.
No. Only the five whole letters A, B, C, D and F are supported, and credit weighting is not applied, so every course counts once in the distribution.