DASS-21 Scoring & Interpretation · Calculator + Severity Bands

The DASS-21 (Depression Anxiety Stress Scales-21) is a 21-item self-report questionnaire that rates the severity of depression, anxiety and stress over the past week, with three 7-item subscales. It is the short form of the 42-item DASS from the University of New South Wales ^[1].

What does the DASS-21 measure?

The DASS-21 is a dimensional self-report scale that assesses the severity of three related but distinct negative emotional states: depression (dysphoria, hopelessness, anhedonia), anxiety (arousal, fear, panic), and stress (tension, irritability, difficulty relaxing). In the original DASS study, the scales separated depression, anxiety and stress more clearly than the Beck inventories did ^[1].

It is not a diagnostic tool but is useful for tracking symptom severity and treatment outcomes.

Each of the three subscales contains 7 items rated on a 4-point Likert scale (0 = Did not apply to me at all; 3 = Applied to me very much or most of the time) over the past week.

The DASS-21 is used in mental health research, clinical screening and treatment outcome measurement. It is valued for separating depression from anxiety, two conditions that often co-occur.

Depression subscale

Measures dysphoria, hopelessness, devaluation of life, self-deprecation, lack of interest or involvement, anhedonia, and inertia.

Anxiety subscale

Measures autonomic arousal, skeletal muscle effects, situational anxiety, and subjective experience of anxious affect.

Stress subscale

Measures difficulty relaxing, nervous arousal, irritability/agitation, impatience, and over-reactivity to situations.

Public domain

The DASS-21 is part of the DASS, which its authors at the UNSW School of Psychology state is in the public domain; the questionnaire may be downloaded from the UNSW DASS website. The DASS manual is sold separately.

How do you give the DASS-21?

The DASS-21 is a self-report questionnaire. Respondents rate how much each statement applied to them over the past week. Because it does not require clinician administration, it is well suited to routine outcome monitoring and repeated measurement across treatment episodes.

The DASS-21 includes 21 items, rated 0 (Did not apply to me at all) to 3 (Applied to me very much or most of the time).

What each subscale covers (item wording is not reproduced here):

• Depression: low mood, hopelessness and loss of meaning or interest
• Anxiety: physical arousal, panic and situational anxiety
• Stress: tension, irritability and difficulty relaxing

Item response scale (same for all items)

Rate each statement based on how much it applied to you over the past week.

Response scale: 0 = Never, 1 = Sometimes, 2 = Often, 3 = Almost always

How do you score and interpret the DASS-21?

1. Rate each of the 21 items from 0 (Did not apply to me at all) to 3 (Applied to me very much or most of the time), for the past week.
2. Add the 7 items in each subscale: Depression (items 3, 5, 10, 13, 16, 17, 21), Anxiety (items 2, 4, 7, 9, 15, 19, 20) and Stress (items 1, 6, 8, 11, 12, 14, 18).
3. Multiply each subscale sum by 2 for a scaled score of 0 to 42 that maps to the DASS-42 normative bands.
4. Compare each scaled score with its own severity bands below; Depression, Anxiety and Stress use different cutoffs.
5. Report the three scores separately. There is no meaningful total DASS-21 score.

Depression (multiplied score):

• 0–9: Normal
• 10–13: Mild
• 14–20: Moderate
• 21–27: Severe
• 28+: Extremely severe

Anxiety (multiplied score):

• 0–7: Normal
• 8–9: Mild
• 10–14: Moderate
• 15–19: Severe
• 20+: Extremely severe

Stress (multiplied score):

• 0–14: Normal
• 15–18: Mild
• 19–25: Moderate
• 26–33: Severe
• 34+: Extremely severe

The ×2 step is needed because the DASS-21 uses only half the items of the DASS-42; without it, every score reads lower than its true severity level. It is the part of DASS 21 scoring most often done incorrectly by hand, which is why the calculator above applies it for you.

Keeping the subscales apart matters clinically: a client may score in the Severe range on Anxiety while scoring Normal on Depression, and that distinction drives different treatment decisions.

Psychometric properties

• Original DASS. In 717 adults, the 42-item DASS had satisfactory psychometric properties and its three-factor structure held in exploratory and confirmatory analyses. Its Anxiety scale correlated 0.81 with the BAI and its Depression scale 0.74 with the BDI ^[1].
• UK norms. In a non-clinical sample broadly representative of UK adults (N = 1,794), confirmatory factor analysis supported a general psychological distress factor plus specific depression, anxiety and stress factors (RCFI = 0.94), and normative data were published ^[2].
• US students. In university samples of 887 and 410 students, a bifactor model fit well and coefficient omega estimates for the scale scores were good ^[3].

Limitations

• Not diagnostic. The DASS-21 is a dimensional severity measure, not a diagnostic screener; diagnosis requires clinical evaluation.
• Normative, not ROC-derived, bands. Severity bands are based on general population distributions, not case-identification thresholds.
• Shared distress factor. Each subscale also taps a general dimension of psychological distress or negative affectivity, so subscales are related rather than fully independent ^[2].
• No suicide item. Unlike the PHQ-9 (item 9), the DASS-21 does not explicitly assess suicidal ideation.
• Self-report. Scores depend on the respondent's insight into and willingness to report symptoms over the past week.

DASS-21 vs PHQ-9 + GAD-7

Both approaches screen for depression and anxiety. The right choice depends on your clinical workflow and what you need to measure.

• Use the DASS-21 when you need to capture and differentiate stress alongside depression and anxiety, particularly in research, psychological assessment, or contexts where the stress subscale adds treatment-planning value.
• Use the PHQ-9 + GAD-7 for primary care SBIRT workflows, measurement-based care in depression treatment, or when suicidal ideation needs explicit assessment (PHQ-9 item 9).

Documenting DASS-21 scores in clinical notes

DASS-21 scores belong in the Objective section of your note. See the SOAP notes guide for templates and examples.