A 63 percent grade is a D letter grade. A letter grade D means less than satisfactory or below average performance in a class or on a test. Any percentage score in the 63-66.9 range is a D on the grade scale table.
A 63 is a D and is one percentage point above a D-.
Aside from 63 out of 100, there are numerous ways students can end up with 63% grades. Here are scales for common number of test questions that can lead to a 63 grade.
Reference table of the percentage grade scale with letter grade and unweighted GPA point equivalents. This grade scale is used my most U.S. middle schools, high schools and colleges.