Grade Point Average, GPA
The GPA is a system of judging a student's performance and is followed throughout the United States.
If a student seeking admission to graduate studies has grades in a different system he/she should clearly mention that GPA system does not exist and provide details on the system.
In event of a system different form the usual GPA system, some universities may ask for a detail method of evaluation of the scores with respect to their scales. In such case consult the Registrar or the controller of examination of the University for an official evaluation to be included along with the transcripts. It is recommended to send your rank certificate/official average score of class/toppers grades etc to ease difference between GPA and your system.
GPA is one of the most important factor to get admission in a good college. Higher GPA with above average GRE/SAT score can get you into top 50 College. Class rank can get you in top 20 colleges. GPA is clear indication of your academic record (it shows you have ability to perform well in academics, no other score can give better indication of your academics)
US GPA System
Please note: There are grades in between too..
Try to make table of your University system and GPA system. Show the comparison between GPA and your System and get it sealed with University registrar and send it along with transcripts.
You can also use print of below URLs.
More info on GPA Conversion
GPA calculator information of some colleges:
Most US universities have a minimum Undergraduate GPA requirement of at least 3/4 for admission to graduate program. Minimum requirement for PhD is much more than 3/4. But evaluation of GPA might vary for international students. Also GPA is not the only criteria for admission we have seen students getting admission in top universities with low GPA. We have seen in lot of cases where students get admission in graduate school with less GPA of less than 3/4. Your chances of getting into top university will reduce but you will get admission in some college (Many International students have this question: "My GPA is <3/4 should I even consider applying to American University?">