The Internet Addiction Test (IAT) is a 20-question self-report tool for reflecting on internet-use patterns and their effects on daily life. In the manual version described here, respondents rate how often each statement applied during the past month; the total can reach 100. The result is a screening or self-reflection measure, not a diagnosis.
What the Internet Addiction Test measures
Developed by Kimberly S. Young, the IAT asks about behaviors and consequences associated with internet use. Topics include staying online longer than intended, difficulty cutting down, neglected responsibilities, sleep, relationships, and how a person feels when offline. It is intended to describe patterns, not to determine a clinical condition by itself.
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The questions focus on a person’s own report. That makes the questionnaire useful for organizing concerns, but its score should be interpreted alongside the person’s circumstances and functioning rather than treated as a definitive clinical finding.
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The manual hosted by IIT Kanpur instructs respondents to consider the past month and select how often each of the 20 statements applies. In that version, each answer is scored from 0 to 5; adding the item scores produces a total from 0 to 100. The manual copy does not state a publication year. Read the IAT manual hosted by IIT Kanpur.
What an IAT score means
Published materials use different score categories, so a cutoff should always be attributed to the particular source rather than presented as a universal standard.
| Source and context | Score categories |
|---|---|
| IAT manual hosted by IIT Kanpur; publication year not stated in the located copy | 0–30: normal; 31–49: mild; 50–79: moderate; 80–100: severe |
| 2012 paper on US college students, reporting categories from cited author guidelines | Below 40: average; 40 or above: problematic; 70 or above: severely problematic |
The categories do not align: for example, the manual places scores from 31 to 49 in its mild band, while the 2012 paper calls scores below 40 average. Neither scheme turns an IAT total into a diagnosis. A score can be a prompt to examine whether internet use is interfering with responsibilities, sleep, relationships, or other parts of life.
In the 2012 US college-student sample, 190 of 215 participants (88%) scored below 40 and 25 (12%) scored 40 or above under that paper’s categorization. Those are results from that particular sample, not an estimate of how common problematic internet use is in the general population. Read the 2012 college-student study.
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Studies have not found one consistently established structure for the questionnaire. In 2004, Widyanto and McMurran analyzed 86 valid respondents recruited online and identified six factors: salience, excessive use, neglecting work, anticipation, lack of control, and neglecting social life. They described the scale as useful for further research while noting the need for systematic psychometric testing. See the 2004 study indexed by PubMed.
A 2012 study of US college students found two interpretable factors, labeled dependent use and excessive use. Its authors also noted ambiguity in earlier factor analyses and concluded that further psychometric assessment was warranted. In their words, “Further assessment of the IAT is warranted for both theoretical and psychometric reasons.”
A 2018 study of US young adults aged 21–28 reported a mean weighted kappa of 0.45 across the 20 items and described good reliability in that study population. That result does not establish diagnostic accuracy for people of all ages, languages, or settings. Read the 2018 study of a young adult US population.
Quick Recap
How to use the result responsibly
- Read the category system alongside its source; do not mix the manual’s bands with the 2012 paper’s categories.
- Look at which behaviors and life effects prompted concern, not only the total score.
- If internet use is causing distress or disrupting daily functioning, consider discussing those concerns with a qualified mental-health professional. The questionnaire score alone does not establish that treatment is needed.
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