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Academic grading in the United States

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Through Normal distribution, Average and Standard deviation

Grades A–F in the United States

Numerical and letter grades

The typical letter grades awarded for participation in a course are (from highest to lowest) A, B, C, D and F. Variations on the traditional five-grade system allow for awarding A+, A, A−, B+, B, B−, C+, C, C−, D+, D, D−, and F. In primary and secondary schools, a D is usually the lowest passing grade. However, there are some schools that consider a C the lowest passing grade, so the general standard is that anything below a 60% or 70% is failing, depending on the grading scale. In post-secondary schools, such as college and universities, a D is considered to be an unsatisfactory passing grade. Students will usually still earn credit for the class if they get a D. However, a C or better may be required to count some major classes toward a degree, or to satisfy a prerequisite requirement for a class.

To assess individual students' grades across multiple courses, letter grades are typically assigned a numeric rank from which a mean grade (Grade Point Average or GPA) is calculated.

Percentage grades

The 100-point scale is a percentage-based grading system. In a percentage-based system, each assignment regardless of size, type, or complexity is given a percentage score: four correct answers out of five is a score of 80%. The overall grade for the class is then typically weighted so that the final grade represents a stated proportion of different types of work. For example, daily homework may be counted as 50% of the final grade, chapter quizzes may count for 20%, the comprehensive final exam may count for 20%, and a major project may count for the remaining 10%. Each are created to evaluate the students' understanding of the material and of their complex understanding of the course material.

Grade conversion

Below is the grading system found to be most commonly used in United States public high schools, according to the 2009 High School Transcript Study. This is the most used grading system; however, there are some schools that use an edited version of the college system. If the score is a decimal, it is rounded to the nearest integer, which means 89.5 or above becomes an A average, 79.5 becomes a B, and so on.

Below is a grading system used by some colleges in the United States. Other schools use different systems, so this system is not universal. MIT, for example, uses a scale that goes up to 5.0.

AF and XF

AF is a grade used at some U.S. colleges and universities to denote failure for non-attendance or withdrawing from a course after the refund period has lapsed. XF can also be used to denote students who are caught performing acts of academic dishonesty. The first school to popularize the XF grade was the University of Maryland. The general intent to assign an AF or XF grade is to make it evident from the transcript as to what caused the failing grade. Students at Wichita State University who did not wish for "F"s on their transcript to be mistaken for academic dishonesty, requested that their university adopt the XF grade. Students at Thomas Edison State University requested that XF grades that had been assigned because they missed the withdrawal deadline be omitted from official transcripts, leading to a policy change within the university. The request was sparked, in part, by inconsistent grading policies among universities issuing XF grades.

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