Turnitin AI score, explained: what the numbers actually mean

A Turnitin AI score is the percentage of your paper the tool thinks was AI-generated. It is an estimate, not proof. Here is what each range means.

What does the Turnitin AI score mean?

It is the share of your text Turnitin estimates was written by AI, from 0 to 100 percent. It is a probability estimate, not proof, and it can be wrong, especially on honest, simple, or non-native English writing.

What does a star or asterisk mean on my Turnitin AI score?

Turnitin shows a star instead of a number when the AI score is under 20 percent. It means the score was too low for Turnitin to display, so your professor sees only the star. Treat it as very low.

What is a good Turnitin AI score?

Lower is safer. Under 20 percent shows as a star and is usually fine. Roughly 20 to 50 percent tends to draw a closer look. Higher invites scrutiny. There is no official pass mark, so schools set their own view.

What is the difference between the AI score and the similarity score?

They are two different checks. The similarity or plagiarism score measures text matching other sources. The AI score estimates how much was written by AI. A paper can be low on one and high on the other, so both are worth seeing.

Is a 30, 40, or 50 percent AI score bad?

These ranges usually draw a closer look from a professor. They do not prove misconduct, but they are high enough that many students choose to revise before submitting. Checking your score first lets you decide.

How can I see my Turnitin AI score before I submit?

Most schools do not give students a pre-check. GradeHaven runs your paper through the same Turnitin your school uses and sends you the AI and plagiarism reports first, for four dollars. See how to check your Turnitin score before you submit.