Beck Depression Inventory Calculator
The Beck Depression Inventory (BDI-II) is one of the most widely used psychometric tools for measuring depression severity. Developed by Aaron T. Beck, the BDI-II consists of 21 items, each rated 0–3, covering emotional, cognitive, and somatic symptoms. This calculator scores your total (0–63) and classifies severity from minimal to severe depression.
How the Beck Depression Inventory Works
The BDI-II asks respondents to rate 21 statements according to how they have felt over the past two weeks, including today. Each item has four options rated 0 to 3, from the absence of symptoms (0) to the most severe expression (3). The total score is the sum of all 21 items, with a maximum of 63.
Unlike the PHQ-9 which is designed primarily for screening in primary care, the BDI-II was developed to capture a broader range of cognitive and somatic depressive symptoms, making it particularly useful for monitoring treatment response in clinical and research settings. The BDI-II specifically includes two weeks as the reference period (versus the original BDI's one week) to align with DSM-IV and DSM-5 major depressive episode criteria.
Disclaimer: This tool is for educational and clinical reference purposes only. It does not constitute a diagnosis. If you are experiencing significant depressive symptoms or thoughts of self-harm, please contact a healthcare professional or crisis service immediately.
BDI-II in Clinical Practice and Research
The BDI-II is one of the most cited instruments in psychiatric research, with over 2,000 published validation studies across diverse populations and languages. It demonstrates strong internal consistency (Cronbach's alpha 0.91 in clinical populations), excellent test-retest reliability, and convergent validity with clinician-rated scales such as the Hamilton Depression Rating Scale (HDRS).
In antidepressant trials, the BDI-II is frequently used as a patient-reported outcome alongside the clinician-rated MADRS (Montgomery-Åsberg Depression Rating Scale). A 50% reduction in BDI-II total score from baseline is commonly used as the definition of response; remission is typically defined as a score below 14. The BDI-II is also sensitive to change within short intervals (2–4 weeks), making it practical for monitoring early treatment response to SSRIs or psychotherapy.
Interpreting Your BDI-II Score: Next Steps
If your BDI-II score falls in the minimal range (0–13), your depressive symptoms are at subclinical levels. Monitoring and lifestyle factors (sleep, exercise, social connection) remain important. In the mild range (14–19), symptoms may benefit from structured psychological support such as CBT-based self-help, mindfulness programs, or counseling. In the moderate range (20–28), a consultation with a GP or mental health professional is strongly recommended — evidence-based treatments include CBT, interpersonal therapy, and antidepressant medication. In the severe range (29–63), please seek professional help promptly. Effective treatments exist for severe depression, including combination therapy and, in treatment-resistant cases, options such as TMS or ketamine-based interventions.
No score on this tool replaces a conversation with a qualified clinician.
Frequently Asked Questions
What is the Beck Depression Inventory?
The Beck Depression Inventory (BDI or BDI-II) is a 21-item self-report questionnaire developed by psychiatrist Aaron T. Beck in 1961 and revised in 1996. Each item is rated 0–3 based on symptom severity over the past two weeks. Total scores range from 0 to 63 and classify depression as minimal, mild, moderate, or severe.
What do BDI-II scores mean?
BDI-II score interpretation: 0–13 = minimal depression; 14–19 = mild depression; 20–28 = moderate depression; 29–63 = severe depression. These cutoffs apply to the BDI-II (1996 revision). Scores should always be interpreted in the context of a full clinical interview.
What does the BDI-II measure?
The BDI-II assesses 21 symptom domains over the past two weeks: sadness, pessimism, past failure, loss of pleasure, guilty feelings, punishment feelings, self-dislike, self-criticalness, suicidal thoughts, crying, agitation, loss of interest, indecisiveness, worthlessness, loss of energy, sleep changes, irritability, appetite changes, concentration difficulty, fatigue, and loss of interest in sex.
Is the BDI-II the same as the PHQ-9?
Both measure depression severity but differ in structure. The PHQ-9 has 9 items, is in the public domain, and is more commonly used in primary care screening. The BDI-II has 21 items, is more detailed, and is often preferred in psychiatric research and treatment monitoring. Both correlate well (r ≈ 0.75).
Can the BDI-II diagnose depression?
No. The BDI-II measures the severity of depressive symptoms — it is not a diagnostic instrument. A diagnosis of major depressive disorder requires clinical assessment by a qualified mental health or medical professional. If you score in the moderate or severe range, please seek professional support.