Psychiatry

PHQ-9 (Patient Health Questionnaire-9) Calculator

Depression screening and severity assessment

Calculate PHQ-9

Little Interest or Pleasure

Feeling Down/Depressed/Hopeless

Sleep Problems

Feeling Tired/Little Energy

Poor Appetite or Overeating

Feeling Bad About Yourself

Trouble Concentrating

Moving Slowly or Being Fidgety

Thoughts of Self-Harm

Clinical use

Use this calculator for depression screening and severity assessment in thepsychiatry workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.

Interpretation

Score 5-9: mild. 10-14: moderate. 15-19: moderately severe. 20-27: severe depression. Item 9 (self-harm) always requires clinical assessment regardless of total score.

Required inputs

Little Interest
Feeling Down
Sleep Problems
Little Energy
Appetite Problems
Feeling Bad About Self
Trouble Concentrating
Moving Slowly Or Fidgety
Thoughts Of Self Harm

Evidence and limitations

This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.

References

Kroenke K et al. J Gen Intern Med 2001;16:606-613

Frequently asked questions

What is the PHQ-9 (Patient Health Questionnaire-9)?

PHQ-9 (Patient Health Questionnaire-9) is a clinical calculator used for Depression screening and severity assessment.

How do I interpret the PHQ-9 (Patient Health Questionnaire-9)?

Score 5-9: mild. 10-14: moderate. 15-19: moderately severe. 20-27: severe depression. Item 9 (self-harm) always requires clinical assessment regardless of total score.

What inputs are required for the PHQ-9 (Patient Health Questionnaire-9)?

Required inputs include Little Interest, Feeling Down, Sleep Problems, Little Energy, Appetite Problems, Feeling Bad About Self, Trouble Concentrating, Moving Slowly Or Fidgety, Thoughts Of Self Harm.