GPAtlas🧮 Clinical calculator · Mental health
PHQ-9 depression severity
Nine questions about the last 2 weeks, scored 0 to 27. NICE NG222 draws its line at 16. It measures severity in someone already being assessed, and does not diagnose.
Free to use, no account needed. Result: PHQ-9 score. Last reviewed 3 Aug 2026.
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Before you rely on the result: A severity scale, not a diagnosis. Any answer above zero on item 9 needs a conversation about risk whatever the total is.
Related Ocean Article: Depression.
Further reading: Suicide Risk Assessment and Prevention · Self-harm · Postnatal Mental Health.
Part of the GPAtlas clinical calculators, each result explained, built by practising UK GPs.