BDI-II: Beck Depression Inventory, second edition

What this assessment is

The Beck Depression Inventory, second edition, or BDI-II, is a 21-item self-report measure of depression symptom severity.

Aaron Beck, Robert Steer, and Gregory Brown published this edition in 1996. It replaced earlier versions of the Beck Depression Inventory and changed the timeframe from one week to two weeks.

The BDI-II measures symptoms. It does not make a diagnosis.

Name the edition.

BDI, BDI-IA, and BDI-II scores should not be treated as the same measure.

Who it was designed for

Pearson describes the BDI-II for people aged 13 to 80 in clinical and nonclinical settings.

It can support symptom review, treatment monitoring, and research. It should sit within a broader assessment when the result may affect diagnosis or care.

Age, language, reading needs, medical illness, and the reason for assessment can affect interpretation. Evidence from one group does not automatically transfer to another.

How it is administered

The respondent selects one response for each of 21 symptom groups based on the past two weeks, including the day of completion.

Pearson reports a typical completion time of about five minutes. The form can be self-administered or read aloud by a trained administrator.

Keep the method consistent when tracking change. A private self-report and a verbally administered form can create different disclosure conditions.

Complete all 21 symptom groups before calculating a standard total. If a response is missing or more than one response is marked, follow the current BDI-II manual instead of guessing or prorating.

What it measures

The BDI-II covers cognitive, emotional, motivational, and physical symptoms associated with depression.

This mix is useful, but it also creates overlap. Sleep, appetite, energy, concentration, and other physical symptoms can change because of medical conditions, medication, substance use, grief, or another mental health condition.

The PHQ-9 maps closely to current major-depression symptom criteria. The BADS measures activation and avoidance during behavioral treatment. Neither is interchangeable with the BDI-II.

Measure first. Explain the construct.

How scoring works

Each symptom group contributes a score from 0 to 3. Add the 21 selected values for a total from 0 to 63.

Higher totals indicate greater reported depression symptom severity.

The standard total is a simple sum for a complete form. Do not create a score by treating missing responses as zero.

One symptom group concerns thoughts of death or self-harm. Any concerning response needs direct review, regardless of the total or severity label.

The total is not a safety score.

How to interpret a BDI-II score

The manual-derived ranges commonly used for the BDI-II are:

• 0 to 13: minimal
• 14 to 19: mild
• 20 to 28: moderate
• 29 to 63: severe

These labels describe the level of symptoms reported on this measure. They do not confirm major depressive disorder.

A total near a boundary should not drive a decision by itself. Review the response pattern, functioning, history, current safety, medical context, and change over time.

Use the same edition and administration method for repeated measurement.

What the score cannot tell you

The BDI-II total cannot identify the cause of symptoms, establish episode duration, or rule out another condition.

It also cannot replace a direct suicide-risk assessment. One response can require urgent attention even when the total sits in a lower range.

People with the same total can have different symptoms and different needs.

Do not choose treatment from the number alone.

Evidence and limitations

The Pearson BDI-II record confirms the 1996 edition, 21-item structure, two-week timeframe, age range, and administration methods.

A systematic review in medical populations found substantial evidence for the measure but warned that physical illness can complicate interpretation and that decision thresholds need population-specific support.

Self-report depends on understanding, recall, privacy, and willingness to disclose. Scores also lose meaning when the edition, language, or scoring rules are not recorded.

Keep the version with the result.