What Plagiarism level of master thesis is acceptable? I am checking plagiarism of my master thesis.  It comes out 32 percent.  So upto what level of plagiarism is accepted?
My master thesis is on the topic of homomorphic encryption in Cloud and I uses turnitin online service for plagiarism checking.
Edit: I apologize that I do not included the detail that plagiarism level comes out 32 percent when I include my research paper as it is in my thesis. The paper are going to publish in IEEE conference. If I exclude this research paper, The plagiarism level is 12 percent.I also posted question related to it on academic stack exchange and if anyone interested, you can check the link
 Can research paper information be used in thesis writing?
The turnitin tool is saying that it thinks 32% of the text of your thesis could have been taken from other sources.  

The software is a very blunt tool, and often has difficulty recognizing common turns of phrase and specialized terminology (e.g. I've seen "Without loss of generality we can assume that"  and "Traveling Salesman's Problem" flagged.)  It also doesn't recognize situations where there's a direct quote (properly delineated and cited) from another source.   

Thus it's necessary for a human to review the report generated by the software to see what's going on.  Without seeing that report, no one can give you an authoritative answer to your question.  However, in my experience, I've never seen a paper with this high a score that didn't have significant problems.  

To directly answer your question, no amount of plagiarism is acceptable in a master's thesis.