Converting percentage marks in certain systems to grade point average in the American system is somewhat complicated. In order to convert percentages to gpa, the evaluator must know the grading scale of a particular school. For instance, if the lowest passing grade is 35%, grades above 70% would be rare.
Percentage U.S. Grade Equivalent Approximate GPA
60-100 A 4.00
55-59 B+ 3.33
50-54 B 3.00
43-49 C+ 2.33
35-42 C 2.00
0-34 F 0.00
Grades which fall at the high or low end of a bracket can be converted to gpa. For instance, a 62% can be viewed as an A- or 3.67; or a 48 or 48% might be viewed as a B- or 2.67 gpa. Since there are different scales of marking available in India , it is up to the evaluator to make the most accurate conversion of percentage to gpa.
I have written several times you should not convert the grades. Submit them as provided by your Institute.This information is provided to help you in the selection of your universities for Applying.