What Does the Asterisk (*%) Mean on a Turnitin AI Detection Report?
Table of Contents
- How Does Turnitin Calculate AI Detection Scores And What Do Different Percentage Ranges Indicate?
- Why Does Turnitin Display Low AI Scores Below 20% As An Asterisk (*%) Instead Of A Precise Number?
- Can Students Preview Their Turnitin AI Detection Report Before Submitting To Their University?
- FAQ
- Sources
- Related articles
Direct Answer - The asterisk (%) on a Turnitin AI detection report means the document received an AI score between 1% and 19%, which Turnitin deliberately displays as % instead of a precise single-digit or low percentage. This design choice reflects the model's lower statistical confidence in predictions below 20% and prevents over-interpretation of results that should not be used as definitive evidence of AI-generated content [1]. The asterisk is not a hidden score, an error, or a placeholder for zero—it is Turnitin's intentional method of communicating that while some AI writing may be present, the prediction lacks the confidence needed for a conclusive determination.
How Does Turnitin Calculate AI Detection Scores And What Do Different Percentage Ranges Indicate?
Turnitin's AI detection model evaluates submitted documents by breaking the text into segments of roughly a few hundred words (about five to ten sentences). These segments overlap so that each sentence is evaluated in context. The model then assigns each sentence a score between 0 and 1, where 0 indicates human-written text and 1 indicates AI-generated text. By averaging these per-sentence scores across the entire document, Turnitin produces an overall percentage prediction of how much of the submission was likely generated by an AI tool [1].
The AI writing detection indicator uses a color-coded system to help educators interpret results at a glance. A score of 0% appears as a blue "non-detected" badge, meaning the model found no evidence of AI-generated text. Scores in the 1% to 19% range display as *% in a yellow indicator, signaling low-confidence detection. Scores from 20% to 49% appear in red, indicating a moderate level of AI-generated content. Scores between 50% and 79% show in orange, representing significant AI writing, while scores of 80% to 100% display in purple for high confidence that most or all of the document was AI-generated [2].
Importantly, Turnitin trains its model on a representative sample of authentic academic writing across geographies, subject areas, and language backgrounds to minimize bias. The model is designed to detect a wide range of AI models including GPT-3, GPT-3.5, GPT-4, GPT-5, Gemini, Claude, LLaMA, and tools based on these large language models [1]. Turnitin emphasizes that the percentage on the AI writing indicator should not be used as the sole basis for academic action—it provides data for educators to make informed decisions based on their institutional policies [2].
Why Does Turnitin Display Low AI Scores Below 20% As An Asterisk (*%) Instead Of A Precise Number?
Turnitin deliberately designed the AI writing report to display any score below 20% as *% rather than as a single-digit percentage such as 3%, 7%, or 12%. This decision stems from the model's lower confidence in predictions at the low end of the scoring spectrum. When the detection model identifies a small percentage of potentially AI-generated text, the statistical signal is weaker and more susceptible to false positives [3]. The asterisk functions as a visual cue that the result should be interpreted with caution rather than taken as a precise measurement.
The only explicit low numeric outcome on a Turnitin AI detection report is 0%, which means the model found no detectable AI-generated text. Every other sub-20% result—whether the underlying calculation produces 2%, 8%, 14%, or 19%—is uniformly represented as *% [3]. This design prevents educators and students from drawing overly precise conclusions from what is inherently a low-confidence prediction. Turnitin's official guidance advises that scores below 20% should not be used as evidence of academic misconduct, and the asterisk serves as a constant visual reminder of that limitation [2].
This approach aligns with Turnitin's broader philosophy of providing actionable data for educators rather than definitive proof of misconduct. By suppressing precise low-percentage numbers behind the asterisk notation, Turnitin reduces the risk that instructors will over-rely on marginal detection signals when evaluating student work. The asterisk is not a loophole or a bug—it is a deliberate feature designed to promote fair and informed interpretation of AI detection results [3].
Can Students Preview Their Turnitin AI Detection Report Before Submitting To Their University?
Under standard Turnitin configurations, students cannot self-check their papers for AI detection within Turnitin without uploading to an official assignment created by an instructor. The AI writing detection indicator is visible only to instructors and administrators—students do not see the AI score or report when they submit their work through institutional channels [1]. This means that without proactive measures, students may only discover their AI detection score after their instructor has already reviewed it.
Some institutions offer Turnitin Draft Coach, which allows students to run similarity checks and, where enabled, AI detection previews directly within Google Docs or Microsoft Word before final submission. However, Draft Coach availability depends entirely on institutional licensing and configuration [4]. Where Draft Coach is not available, students who want to preview their AI detection results must rely on assignment resubmission workflows—typically limited to three resubmissions per 24-hour period—provided the instructor has enabled resubmissions in the assignment settings [4].
Given these institutional restrictions, many students use services that provide Turnitin-format AI detection and similarity reports before submitting to their university. These services generate reports that match what instructors see in the institutional Turnitin system, including the same score ranges, color coding, and asterisk notation for sub-20% results. This allows students to understand where their work stands before it reaches their instructor's dashboard, enabling them to address potential AI writing flags proactively.
If you want to see exactly what your Turnitin AI detection report looks like—including how the asterisk (*%) appears and which sections of your document are highlighted—you can preview an authentic Turnitin AI report before your instructor ever sees it. Knowing where your score falls before submission puts you in control of your academic integrity.
※ Turnitin0.com - Actual Turnitin AI Report Cover, Score, Flag And Similarity Summary
FAQ
1. Does *% mean there is no AI in my document?
No. The asterisk (*%) represents scores between 1% and 19%. A 0% result is displayed separately as a blue "non-detected" badge. The asterisk indicates the model found some signals suggesting AI-generated content, but at a level below its confidence threshold for a precise percentage [1][3].
2. Can my instructor see the exact number behind the asterisk?
No. When the AI detection report displays *%, instructors see the same asterisk notation that students' services would show. Turnitin does not reveal the precise underlying percentage for sub-20% scores—the asterisk is the final display value for both instructors and administrators [2][3].
3. Why did I get *% when I wrote my paper entirely by hand?
False positives can occur in low-confidence ranges. Turnitin's model maintains a false positive rate of less than 1% for high-confidence predictions, but the sub-20% range is specifically designed to capture cases where the model is uncertain. Human writing that is highly consistent or formulaic can occasionally generate low-level signals that fall in the *% range [1][3].
4. Can I check my Turnitin AI score before submitting to my university?
Within institutional Turnitin, students generally cannot see the AI detection indicator. However, services like Turnitin0.com provide Turnitin-format AI detection reports that show the same score ranges, colors, and asterisk notation that instructors see, enabling pre-submission checks before your document reaches your instructor's dashboard [4].
5. Should I be concerned about a *% score?
A % score (1-19%) is the lowest detection tier above the 0% baseline. It means the model has low confidence in flagging your document. While not a clean bill of health, % is significantly better than a score above 49% and indicates that any AI signals detected are marginal and statistically uncertain [2].
Sources
- Turnitin's AI Writing Detection Capabilities FAQs — https://guides.turnitin.com/hc/en-us/articles/28477544839821-Turnitin-s-AI-writing-detection-capabilities-FAQs
- AI Writing Detection Frequently Asked Questions — https://www.turnitin.com/blog/ai-writing-detection-frequently-asked-questions
- What the AI Writing Detection Indicator Means — https://www.turnitin.com/blog/what-the-ai-writing-detection-indicator-means
- Can Students Check a Paper Before Submitting — https://helpcenter.turnitin.com/hc/en-us/articles/27811948436237-Can-students-check-a-paper-in-Turnitin-for-Similarity-before-submitting-it-to-an-assignment