Turnitin similarity 45%: will I fail?

The score is not a plagiarism verdict

Turnitin's percentage is simply the share of your text that matches something in its databases. Your bibliography, quoted passages, standard methodology wording, the university's own template and even your own earlier submission can all count. Two reports with 45% can mean completely different things.

How Indian universities read it

For theses and dissertations, the UGC (Promotion of Academic Integrity and Prevention of Plagiarism in Higher Educational Institutions) Regulations, 2018 set the reference levels after exclusions:

• Up to 10%: minor, no penalty.
• Above 10% to 40%: revised script within a set period (up to six months).
• Above 40% to 60%: barred from submitting a revised script for one year.
• Above 60%: registration for the programme cancelled.

The regulations exclude quoted and acknowledged material, references and bibliography, table of contents, preface and acknowledgements, and generic terms, laws, symbols and standard equations. Many institutions set stricter internal limits for coursework, so always check your own department's rule.

What to do with a 45% report

• Check the filters. Ask whether bibliography and quotes were excluded. That alone often removes a large share.
• Look at the source list. One large match (for example your own earlier submission or a classmate's shared template) is a different problem from many small ones.
• Fix real issues properly: add missing citations, put verbatim text in quotation marks, and rewrite borrowed passages in your own words based on your own understanding, with the source cited.
• Talk to your supervisor early if you believe the score is inflated. A short explanation with the filtered report is usually welcome.

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This guide is general information. Always follow your own university's current regulations and your supervisor's advice.