Free · Private · Research-based
Coffee & Caffeine Self-Test
Twenty short questions that score how strongly caffeine may be affecting you across three domains researchers actually measure: withdrawal, anxiety, and dependence. Items are adapted from validated instruments in the peer-reviewed literature. You get an instant breakdown, charts, and a file you can keep.
Not medical advice. This screener is educational and cannot diagnose a disorder. If symptoms distress you, speak with a clinician.
Your result
Overall caffeine-impact score: —
Score by domain
Each domain as a % of its maximum.
Where your symptoms sit
Share of your total symptom load by domain.
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How this test is built & scored
The Withdrawal items use the ten symptoms empirically validated by Juliano & Griffiths' review of 66 studies — headache, fatigue, low energy, low alertness, drowsiness, low mood, difficulty concentrating, irritability, foggy-headedness and flu-like feelings — the same set that led caffeine withdrawal to be recognised in the DSM-5. The Dependence items mirror the DSM criteria endorsed by real caffeine users (strong desire or failed attempts to cut down, using more than intended, use despite harm, withdrawal-avoidance). The Anxiety items reflect the anxiogenic effects of caffeine documented in controlled challenge studies. Each item is scored 0–4 (or 0/1 for yes-no); domain scores are expressed as a percentage of the maximum. Bands are heuristic, not diagnostic.
According to PubMed. Full citations with DOIs below.