What Is an Acceptable Turnitin Similarity Percentage?
Independent guide. Not affiliated with Turnitin, LLC. Read the Turnitin disclaimer.
There's no universal acceptable Turnitin percentage. Turnitin doesn't set one, and institutions differ. What matters is what matches, not just how much.
Typical ranges people use
| Score | Common reading |
|---|---|
| 0-15% | Usually normal for referenced work |
| 15-25% | Check sources and match groups |
| 25-40% | Likely reviewed closely |
| 40%+ | Usually needs explanation |
These are common rules of thumb, not Turnitin rules. Your institution's policy wins.
Why the number alone misleads
- 9% from one uncited website is worse than 20% of cited quotes.
- Unfiltered references inflate scores.
- Thesis checks, journals and coursework use different expectations (thesis guide).
Acceptable AI score?
No official threshold either. Turnitin shows *% for 1-19% because low scores are less reliable; many reviewers look closer from 20%. See AI score meaning.
Know both numbers before you submit: $3.50. Lower a high AI score with human editing: $5.99 per 200 words.
Frequently asked questions
What is a good Turnitin similarity score?
There's no official cut-off. Many reviewers see under about 15% as normal for referenced work, but it depends on the uncited matches.
What about theses?
Many institutions set their own thresholds for theses; ask your supervisor.
What's an acceptable AI score?
There's no official one. Turnitin hides scores under 20% as *% because they're less reliable.
See your Turnitin AI and similarity scores first.
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