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The Hamilton Depression Rating Scale (HAM-D or HDRS) is the most widely used clinician-rated instrument for assessing depression severity in clinical trials and practice. Originally published by Max Hamilton in 1960, the HAM-D has been the gold standard outcome measure in antidepressant research for over six decades, used in virtually every major antidepressant trial conducted since the 1960s.
The HAM-D is administered as a structured clinical interview by a trained clinician, taking approximately 15-20 minutes. Unlike self-report measures (PHQ-9, BDI-II), the HAM-D incorporates the clinician's observation of the patient's appearance, behavior, and affect in addition to verbal responses. This provides a more comprehensive assessment including both subjective complaints and objective signs of depression.
The original HAM-D consists of 17 items (HAM-D-17), though 21-item and 24-item versions exist. The 17-item version is the standard used in clinical trials and regulatory submissions. Items cover: depressed mood, feelings of guilt, suicide, insomnia (early, middle, late), work and activities, retardation, agitation, anxiety (psychic and somatic), somatic symptoms (GI and general), genital symptoms, hypochondriasis, weight loss, and insight. Items are rated on either 0-4 or 0-2 scales, yielding a total range of 0-52.
The HAM-D-17 severity categories are: 0-7 (normal/remission), 8-13 (mild), 14-18 (moderate), 19-23 (severe), and >=24 (very severe). In clinical trials, a score reduction of >=50% defines clinical response, while a final score of <=7 defines remission. The FDA typically requires demonstration of statistically significant HAM-D score reduction for antidepressant approval.
While the HAM-D remains the research standard, it has some limitations: it heavily weights somatic and sleep symptoms (which may bias toward sedating antidepressants), includes items of questionable relevance (hypochondriasis, insight), and interrater reliability requires careful training. The MADRS was developed partly to address these limitations. Despite criticisms, the HAM-D's extensive research base ensures its continued central role in depression assessment.
The HAM-D uses a clinician-rated scoring approach:
Total Score = Sum of all 17 items (range 0-52)
This calculator includes items 1-7 individually and accepts the sum of items 8-17 as a single input.
Severity Categories (HAM-D-17):
The suicide item (item 3) is separately flagged for safety assessment.
Severity 0 (0-7, Remission): Normal range or in remission. Target endpoint in treatment studies. Severity 1 (8-13, Mild): Mild symptoms. May respond to psychotherapy alone. Severity 2 (14-18, Moderate): Clinically significant. Treatment with antidepressant and/or psychotherapy indicated. Severity 3 (19-23, Severe): Severe depression. Active pharmacological treatment essential. Severity 4 (>=24, Very Severe): Very severe. Consider ECT for treatment-resistant cases. The Suicide Item Score of 3-4 requires immediate safety intervention.
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Results
HAM-D score of 15 = moderate depression. No suicidal ideation. Treatment with antidepressant and/or psychotherapy indicated.
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Results
HAM-D score of 36 = very severe depression. Suicide item score 3 — immediate safety assessment and intensive treatment required.
The Hamilton Depression Rating Scale is a 17-item clinician-rated instrument for measuring depression severity. Published in 1960 by Max Hamilton, it is the most widely used depression scale in clinical research and the standard outcome measure for antidepressant trials.
The HAM-D is clinician-rated (requires trained interviewer), while PHQ-9 and BDI-II are self-reported. The HAM-D includes observed signs (retardation, agitation). It is the research gold standard. The PHQ-9 is the clinical practice standard due to brevity.
HAM-D remission is a total score of <=7, indicating near-absence of depressive symptoms. Response is >=50% score reduction from baseline. Achieving remission is associated with better long-term outcomes and lower relapse rates.
Trained healthcare professionals — psychiatrists, psychologists, psychiatric nurses, or trained research assistants. The GRID-HAMD structured interview guide improves interrater reliability.
Overemphasis on somatic/sleep symptoms, inclusion of items with questionable relevance (hypochondriasis, insight), unequal scoring scales, and variable interrater reliability.
A structured interview guide that separates intensity and frequency ratings for each item. It provides explicit anchor points and improves interrater reliability. Recommended for clinical trials.
Most antidepressant trials require HAM-D-17 score of >=18 or >=20. Some treatment-resistant depression trials require >=24.
The HAM-D-17 total score is the most common primary endpoint in FDA antidepressant pivotal trials. Most approved antidepressants show 2-3 point greater reductions than placebo.
Core depression (mood, guilt, suicide, interest), sleep (3 insomnia items), anxiety (psychic and somatic), somatic (GI, general, genital), and other items. The Bech subscale (6 core items) is sometimes used separately.
Yes, the original HAM-D-17 is in the public domain and free to use. The GRID-HAMD structured interview guide is also freely available.
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Montgomery-Åsberg Depression Rating Scale (MADRS)
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Beck Depression Inventory (BDI)
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