A student with a 3.9 GPA (Grade Point Average) has attained the equivalent of a ‘A’ in standard letter grading systems. Some universities use letter grades, percentages or the standard GPA system. The grades are determined by various factors: credits, course hours and attained grades. Consult the particular school to determine what type of grades they give out and record. To convert a letter or percentage grade into your Grade Point Average, use the chart found below.