What is a good Turnitin similarity score? There is no single pass mark. Turnitin does not set a cutoff score, and most universities and journals judge the match breakdown rather than the total number. A "good" score is one where every match is properly quoted and cited, and no single source accounts for a big block. Still, common ranges exist. Knowing them helps you spot when your draft needs work.
Typical Similarity Ranges by Document Type
These ranges reflect common rules of thumb when quotes and reference lists are excluded. Always check your own department or journal guide first.
| Document type. | Usually safe range. | Worth a close check. |
|---|---|---|
| Class essay. | Under 15% to 20%. | Over 25%, or any single source above 5%. |
| Master's thesis or PhD dissertation. | Under 10% to 15%. | Big matches to one source or to past papers. |
| Journal paper (iThenticate). | Under 15% overall, <2% per source. | Any copied paragraph from a published paper. |
| Literature review chapter. | Up to 20% due to terms and quotes. | Close word-swapping of a few key papers. |
Look closely at the right-hand column. Reviewers care about patterns, not just totals. One 6% match from a single paper is a much bigger problem than fifteen tiny 0.5% phrase matches.
Why the Same Score Can Be Fine or a Problem
A history thesis quotes archival letters often. Every quote sits inside quotation marks with a clear footnote. The report has quotes and references turned on. When the advisor excludes quotes and references, the score drops to 6%.
A discussion chapter shows 9% overall, but 8% comes from one journal article. Two full paragraphs copy that article's structure with only a few swapped words and no citation. This will fail review even though 9% looks low.
What Affects Your Number
- Filter settings: turning quotes, references, and small 8-word matches on or off can shift your score by 15% or more.
- Your field: law, medicine, and engineering use fixed terms and standard method lines that always match.
- Past course uploads: if an earlier draft of your paper was saved to Turnitin's repository, your new upload will match it. Ask your teacher to exclude the old file.
- Your own published papers: thesis chapters based on your own journal articles will match them. Cite your own paper clearly and follow your school's "thesis by publication" rules.
How to Check Whether Your Score Is a Problem
- Open the Match Overview panel on the right side of the report.
- Check every single source that makes up 1% or more of your paper.
- Ask three questions for each match: Is it in quotation marks? Is it cited right there? Or is it copied too closely?
- Fix any uncited or patchwritten lines first (see our guide on how to lower a similarity score ethically).
- When in doubt, show the report to your advisor before final submission.
Stay away from AI "similarity spinners." Tools that swap words with strange synonyms or insert hidden characters to trick Turnitin ruin your prose. Universities and journals treat text spinning as academic misconduct. Fix the real citation issue instead.
Submitting a paper to a Q1 or Q2 journal? Our research paper editing service and Scopus journal publication support check that all quotes and citations meet strict publisher standards. Working on a degree? See our thesis editing services.
Frequently Asked Questions
Is 36% similarity on Turnitin bad?
Not always. If quotes and references are turned on, 36% can be fine for a quote-heavy paper. But if 36% comes from uncited paragraphs, it is a major issue. Check the top sources in your match list first.
Is 10% similarity on Turnitin good?
Usually yes, as long as no single source makes up most of that 10%. Even a 10% score is a problem if 8% is one copied paragraph without a citation.
What similarity score do journals accept?
Most journals aim for under 15% overall on iThenticate, with no single source above 1% or 2%. Editors care most about copied blocks in the introduction or discussion.
Why is my similarity score high when I cited everything?
Common reasons include your reference list being counted, long direct quotes, standard methods phrasing, or an earlier draft saved in Turnitin. Ask your teacher which filters are turned on.