Letter grading as we know it dates to the late 19th century American university system. Harvard introduced letter grades in 1890; Mount Holyoke Female Seminary (now Mount Holyoke College) established the A-F scale in 1897. Before letter grades, universities used pass/fail or numerical scores, and oral examination performance described in qualitative terms. The standardization of A-B-C-D-F spread through U.S. secondary and higher education in the early 20th century, though 'E' was initially used in some systems before being replaced by 'F' (for Failure) to avoid confusion with 'Excellent.' This historical contingency explains why E is absent from the standard scale.

Grade inflation is a documented phenomenon in American higher education. A 2012 study by Stuart Rojstaczer and Christopher Healy found that the national average GPA at four-year colleges rose from 2.52 in the 1950s to 3.11 in 2007, with private schools showing steeper inflation than public ones. Critics argue grade inflation devalues distinctions between students; proponents note that higher grades may partly reflect genuinely improved preparation and access to educational resources. Graduate school admissions, which rely heavily on GPA, have responded by increasingly emphasizing research experience, test scores, and recommendations over raw GPA as grade inflation makes the signal noisier.

Weighted vs. unweighted GPA represents a genuine measurement choice about what educational achievement means. Unweighted GPA treats all courses equally; weighted GPA assigns higher point values to honors, AP, and IB courses to credit academic rigor. A student earning B's in AP courses may have a weighted GPA exceeding a student earning A's in standard courses. Most selective college admissions offices recalculate GPA on a standardized scale anyway, adjusting for course rigor, which means the weighted GPA students and parents track may not be the metric admissions officers actually use. The Common App's grade context section allows counselors to describe course rigor directly.

International grading systems differ dramatically, complicating cross-border academic credential recognition. Germany uses a 1-5 scale where 1 is the highest grade. The UK uses degree classifications (First Class, Upper Second, Lower Second, Third) rather than GPA. France uses a 20-point scale where scores above 14-15 are exceptional. Australia uses High Distinction, Distinction, Credit, Pass, Fail designations. These differences make international graduate admissions complex; organizations like WES (World Education Services) provide credential evaluation services that translate foreign grades into U.S. equivalents, though the conversion necessarily involves judgment about educational system differences.