A grade of 80 percent is equal to a Grade Point Average, or GPA, of 2.7 on a scale of 4.0. This typically translates to a letter grade of B-. The GPA is the standard scale used at most United States high schools and colleges.
The 4.0 scale GPA considers anything above 65 percent to be a passing grade. A student who receives 65 percent has received the equivalent of a GPA of 1.0 and the letter grade D. The highest grade on this scale, 4.0, translates to a letter grade of A for grades of 93-96 percent, and a letter grade of A+ for grades of 97 percent or more.