A 21-item self-report measure of depression severity in adults and adolescents aged 13 and over, scored 0–63. Licensed by Pearson, so we do not host the questionnaire.
The Beck Depression Inventory-II (BDI-II) is a 21-item self-report measure of depression severity in adults and adolescents aged 13 and over. Each item is rated 0–3, giving a total score from 0 to 63. Items cover the affective, cognitive, somatic and vegetative symptoms of depression - including sadness, pessimism, guilt, suicidal thoughts, sleep, appetite and fatigue - over the past two weeks.
Unlike screening tools built directly on diagnostic criteria, the BDI-II was designed to quantify how severe depressive symptoms are rather than to diagnose depression. It remains one of the most widely used severity measures in both research and clinical practice, and the two-week timeframe was chosen to align with DSM-IV criteria for major depressive disorder.
02 - Origin & purpose
Where it comes from.
Aaron T. Beck published the original Beck Depression Inventory in 1961, drawing on the cognitive themes he observed in depressed patients during psychotherapy. The BDI-II, published in 1996 by Beck, Steer and Brown through The Psychological Corporation (now Pearson), was a substantial revision: four items were replaced, others reworded, and the timeframe extended from one week to two weeks to match DSM-IV.
The revision aimed to capture the full DSM-IV symptom picture while preserving the original instrument's strong cognitive emphasis. It has since been translated into dozens of languages and validated across psychiatric, primary-care, medical and student populations, accumulating one of the largest evidence bases of any depression measure.
03 - Scoring & cutoffs
How scoring works.
The 21 items are summed to a total of 0–63. The 1996 manual gives four severity ranges, derived from psychiatric outpatient samples.
These bands describe symptom severity, not diagnosis. A 2019 diagnostic meta-analysis found the optimal screening cut point for major depression varies considerably by setting - around 13 in primary-care and non-clinical samples, but around 19 in psychiatric settings - so the manual's bands should not be treated as diagnostic thresholds.
Score
Severity
Interpretation
0–13
Minimal depression
Symptoms at or near the level seen in non-clinical samples.
14–19
Mild depression
Symptoms present but limited in intensity.
20–28
Moderate depression
Substantial symptom burden; active treatment usually indicated.
29–63
Severe depression
High symptom burden; assess risk and treatment intensity.
04 - Validation evidence
How well it performs.
The BDI-II's psychometric evidence is extensive. A comprehensive 2013 review by Wang and Gorenstein covering studies across clinical and non-clinical populations found consistently high internal consistency and good criterion validity against structured diagnostic interviews. A 2019 diagnostic meta-analysis by von Glischinski and colleagues, pooling studies against gold-standard interviews, identified 14.5 as the overall optimal cut point, while noting that cut points identified as "optimal" in individual studies ranged from 10 to 25.
Free; designed for older adults, avoids somatic items that confound medical illness.
06 - When to use it
Right tool, wrong tool.
The BDI-II earns its place where depth of severity measurement matters more than speed, and where a licence is already in hand. Where it is not, a free instrument will usually do the same clinical job.
Reach for it when
-Quantifying depression severity where a BDI-II licence is already held
-Research programmes requiring comparability with decades of BDI/BDI-II literature
-Settings wanting strong coverage of cognitive symptoms (guilt, pessimism, self-criticism)
-Monitoring severity change in psychotherapy trials
Reach for something else when
-Any clinic without a Pearson licence - per-form fees apply, so use the free PHQ-9 instead
-Quick screening in busy primary care - 21 items is long for that job
-Medically ill populations, where somatic items can inflate scores
-Diagnosis of major depression on its own - no self-report scale replaces clinical interview
-Children under 13
07 - Confidence & precision
Reading the score with care.
A single BDI-II score carries measurement error, so small shifts should not be over-interpreted. From the patient's perspective, the minimal clinically important difference has been estimated at about a 17.5% reduction from baseline score (Button et al., 2015) - roughly 3–4 points for a starting score of 20 - and the same work found the meaningful-change threshold is larger for people with more severe or longer-standing depression (around a 32% reduction in a sample with treatment-resistant depression).
Changes within the same severity band, or of only a few points, are best confirmed by trajectory over repeated measurements rather than a single before-and-after pair.
08 - Limitations
What it cannot tell you.
Licensing cost and administrative burden are the first constraint: each record form must be purchased, and Pearson's user-qualification requirements apply, which rules the instrument out for many services.
Somatic items - fatigue, sleep and appetite - can inflate scores in people with physical illness, so a raised total may reflect medical burden rather than mood.
Optimal cut points vary widely across settings, from about 10 to about 25 in individual studies, so no single threshold is reliable for case-finding across populations.
The self-report format is susceptible to response bias and requires adequate reading ability, and the severity bands were derived from psychiatric outpatients, so they generalise imperfectly to primary care, community and medical populations.
09 - Licensing, explained
How licensing works.
The BDI-II is published by Pearson and is not in the public domain. Administration requires purchasing record forms and meeting Pearson's user-qualification requirements (qualification level B - typically graduate training in psychological assessment). Reproducing items in software, websites or apps without a licence infringes copyright, which is why this page does not host the questionnaire. For a licence, contact Pearson Clinical Assessment. If per-form costs are a barrier, the PHQ-9 and CES-D are free, validated and score comparably well for screening and monitoring.
Common questions from clinicians
FAQ
References
Source literature.
[1]Beck AT, Steer RA, Brown GK. Manual for the Beck Depression Inventory-II. San Antonio, TX: Psychological Corporation (1996) ↩
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