A good similarity score depends on the context of your work:
- 0-10%: Excellent - Very original content
- 11-20%: Good - Some common phrases or quotes
- 21-30%: Acceptable - May need some revision
- 31-50%: High - Significant revision needed
- Above 50%: Very high - Major revision required
Remember that properly cited quotes and references will contribute to the similarity score, so it's important to review the specific matches rather than just the overall percentage.