My GPA of bachelor is about 3.0, and I just want to know how much it would approximately be in German Grade? Would it be lower than 2.7 in German Grade? I have read other questions on this website, but none of them could help me, can you simply tell me how to convert GPA to German grading system?
A GPA of 3.0 is (usually) exactly a B, which is coincidentally 3.0 in German Grade. Note that this is an estimate. Also, the correct way to calculate it would be not to convert the GPA directly, but to go through the transcript and re-compute the average using the German Grade.
This is a tool I found after a second of googling: http://www.foreigncredits.com/Resources/GPA-Calculator/
It has grade tables and even a calculator that can do the math for you.
Without knowing the specifics of your system, no, it's not possible to tell you how to convert your grades (or anyone else's) from one system to another.
However, what you do need to know about the German system is that it works "backwards": a 1 is the best grade, and 5 is a failing grade. The "1,0" corresponds to an A or A+ in an American style 4.0-system, and then moves in increments of 0.3 or 0.4. 4.0 corresponds to a D, and anything below that would be regarded as an F.