The DASS-21 measures depression, anxiety, and stress as three separable dimensions of emotional distress; it is the short form of the original DASS, developed by Lovibond and Lovibond and published through the Psychology Foundation of Australia.
It was built empirically from factor analyses of symptom items, and its three subscales are interpreted as consistent with the tripartite model of anxiety and depression rather than derived from it.
Validation work in clinical and non-clinical samples supports high internal consistency, a replicable three-factor structure with a strong general distress component, and close convergence with the Beck depression and anxiety inventories.
It is a public-domain screening measure with published severity conventions, not a diagnostic instrument; the official guidance stresses that the severity labels describe score ranges relative to the population, not clinical diagnoses.
Typically under 10 minutes (no official figure is published)
Response format
4-point severity/frequency scale, 0 = did not apply to me at all, 3 = applied to me very much, or most of the time; rated over the past week
Subscales or Scores
Depression, Anxiety, and Stress subscale scores; each 7-item sum is multiplied by 2 for comparability with DASS-42 norms
Validated populations or ages
Usable from age 14 with typical language skills (official DASS FAQ); published norms are adult; the DASS-Y is recommended for younger respondents
License
Public domain (Psychology Foundation of Australia); the scales themselves may not be sold
Original citation
Lovibond & Lovibond (1995), Behaviour Research and Therapy; the DASS-21 item set and severity cut-offs are published in Lovibond & Lovibond (1995), Manual for the Depression Anxiety Stress Scales (2nd ed.)
Introduction
The DASS-21 (Depression Anxiety Stress Scales) is a self-report questionnaire measuring the three related negative emotional states of depression, anxiety, and stress. It is the 21-item short form of the 42-item DASS, whose development and validation were reported by Lovibond and Lovibond (1995); the DASS-21 item set itself, together with its severity cut-offs, is published in the accompanying manual (Lovibond & Lovibond, 1995, Manual, 2nd ed.). Because the instrument is in the public domain, it has become one of the most widely administered brief measures of emotional distress in clinical and research settings.
Understanding the Three Dimensions
The DASS-21 treats depression, anxiety, and stress as distinct but correlated constructs. Depression is characterized primarily by dysphoric mood, hopelessness, and low positive affect; anxiety by autonomic arousal, situational anxiety, and subjective anxious affect; and stress by chronic non-specific arousal, tension, and difficulty relaxing. These construct definitions follow the official scoring documentation and the descriptions used throughout the validation literature (Brown et al., 1997; Henry & Crawford, 2005). Assessing all three dimensions in a single administration allows the pattern of scores, not only their overall level, to inform interpretation.
Theoretical Foundation
The DASS was developed empirically, from factor analyses of symptom items, rather than deduced from a prior theory. Its three subscales are commonly interpreted as consistent with Clark and Watson’s tripartite model of anxiety and depression, an interpretation the psychometric literature endorses cautiously: Brown et al. (1997) noted that the DASS predates the model, and Antony et al. (1998) and Norton (2007) likewise describe the correspondence as approximate rather than definitional. On this reading:
Depression is characterized primarily by low positive affect and anhedonia
Anxiety is marked by physiological hyperarousal and acute fear responses
Stress reflects chronic non-specific arousal, tension, and difficulty relaxing
Across validation studies, the three states, while correlated, emerge as distinguishable dimensions of psychological distress (Brown et al., 1997; Antony et al., 1998; Norton, 2007), which is what makes the instrument useful for differential assessment rather than as a single distress index.
📊 Key insight: The DASS-21 yields separate Depression, Anxiety, and Stress scores rather than one global distress total, so a respondent’s profile across the three subscales carries information that a single-score measure cannot provide.
Key Features
Assessment Characteristics
21 items total (7 items per subscale)
Typically under 10 minutes administration time
4-point severity scale for response options, referenced to the past week
Usable from age 14 with typical language skills (official DASS FAQ); the DASS-Y is recommended for younger respondents. Published norms are for adults.
Public domain and free to use for clinical and research purposes
Dimensions Assessed
Depression:
Dysphoric mood and hopelessness
Anhedonia and lack of positive affect
Self-depreciation and worthlessness
Lack of interest and motivation
Inertia and low energy
Anxiety:
Autonomic arousal and panic symptoms
Situational anxiety responses
Subjective anxious affect
Skeletal muscular effects
Physical tension and trembling
Stress:
Chronic non-specific arousal
Nervous tension and agitation
Difficulty relaxing
Irritability and impatience
Easy upset and overreaction
Versions & Adaptations
DASS-42, the original 42-item form (Lovibond & Lovibond, 1995)
DASS-21, the 21-item short form covered on this page, published in the 1995 manual (Lovibond & Lovibond, 1995, Manual, 2nd ed.)
DASS-Y, the youth version distributed via the official DASS website for respondents younger than the DASS-21’s recommended age range
DASS-18, a research short form derived in Henry and Crawford (2005)
Validated translations (Chinese, Spanish, and others) exist in the wider literature and are documented on the official DASS website
Research Applications
Mental health screening in clinical, community, and primary care settings
Treatment outcome monitoring as a baseline and endpoint measure in intervention studies
Research on emotional disorders and comorbidity, where separate depression, anxiety, and stress scores are informative
Workplace wellbeing and student counseling assessments
Cross-cultural and measurement research on the structure of negative emotional states
Assess the three dimensions of emotional distress: depression, anxiety, and stress.
Scoring and Interpretation
Response Format
Participants rate how much each statement applied to them over the past week using a 4-point severity scale:
0 = Did not apply to me at all
1 = Applied to me to some degree, or some of the time
2 = Applied to me to a considerable degree, or a good part of time
3 = Applied to me very much, or most of the time
Complete DASS-21 Items by Subscale
The DASS is in the public domain, so the full item set may be reproduced. The official 21-item set below (item numbers follow the DASS manual and Antony et al., 1998, Table 2) is the instrument the severity cut-offs are calibrated for; only these 21 items should be administered and scored against the table.
Depression Items (7 items):
“I couldn’t seem to experience any positive feeling at all” (item 3)
“I found it difficult to work up the initiative to do things” (item 5)
“I felt that I had nothing to look forward to” (item 10)
“I felt down-hearted and blue” (item 13)
“I was unable to become enthusiastic about anything” (item 16)
“I felt I wasn’t worth much as a person” (item 17)
“I felt that life was meaningless” (item 21)
Anxiety Items (7 items):
“I was aware of dryness of my mouth” (item 2)
“I experienced breathing difficulty (e.g., excessively rapid breathing, breathlessness in the absence of physical exertion)” (item 4)
“I experienced trembling (e.g., in the hands)” (item 7)
“I was worried about situations in which I might panic and make a fool of myself” (item 9)
“I felt I was close to panic” (item 15)
“I was aware of the action of my heart in the absence of physical exertion (e.g., sense of heart rate increase, heart missing a beat)” (item 19)
“I felt scared without any good reason” (item 20)
Stress Items (7 items):
“I found it hard to wind down” (item 1)
“I tended to over-react to situations” (item 6)
“I felt that I was using a lot of nervous energy” (item 8)
“I found myself getting agitated” (item 11)
“I found it difficult to relax” (item 12)
“I was intolerant of anything that kept me from getting on with what I was doing” (item 14)
“I felt that I was rather touchy” (item 18)
Scoring Procedure
Sum the items for each subscale (7 items per subscale; no items are reverse-keyed)
Multiply each subscale sum by 2 to match DASS-42 normative data
Apply severity cut-offs using the table below
Higher scores indicate greater severity of symptoms
DASS-21 Severity Ratings
Severity
Depression
Anxiety
Stress
Normal
0-9
0-7
0-14
Mild
10-13
8-9
15-18
Moderate
14-20
10-14
19-25
Severe
21-27
15-19
26-33
Extremely severe
28+
20+
34+
Cut-offs apply to the doubled (×2) scores and come from the DASS manual (Lovibond & Lovibond, 1995, Manual, 2nd ed.). The official DASS FAQ notes that these severity labels are conventions for describing scores relative to the population, not diagnostic categories.
Score Interpretation Guidelines
Clinical interpretation (suggested practice, not part of the instrument; the official DASS FAQ cautions against reifying the severity labels):
Normal range: Typical emotional functioning, no significant distress
Mild severity: Some emotional difficulties; self-help may be beneficial
Moderate severity: Noticeable distress; consider professional support
Severe severity: Significant psychological distress; clinical intervention recommended
Extremely severe: Very high distress levels; urgent clinical attention indicated
Pattern analysis (clinical guidance, not instrument documentation):
Single elevated subscale: Specific clinical concern (pure depression, anxiety, or stress)
All subscales elevated: Generalized psychological distress across domains
Differential patterns: Help guide treatment focus and intervention selection
Population Norms
Sample
N
Depression M (SD)
Anxiety M (SD)
Stress M (SD)
Source
UK general adults, ages 18-91 (doubled ×2 scores)
1,794
5.66 (—)
3.76 (—)
9.46 (—)
Henry & Crawford (2005), Table 1
US undergraduates (raw, undoubled scores)
895
4.27 (4.32)
3.85 (3.79)
6.11 (4.38)
Norton (2007), Table I
Nonclinical community volunteers (doubled ×2 scores)
49
2.12 (—)
1.22 (—)
3.51 (—)
Antony et al. (1998), Table 4
These are descriptive sample means, not diagnostic norms. The Norton (2007) values are raw (undoubled) scores; double them before comparing with the severity table. Standard deviations not reported in the verified evidence are marked with a dash.
Clinical samples: Patients score well above non-clinical groups across all three subscales. In two large clinical samples (N = 437 and N = 241), the 42-item DASS distinguished anxiety and mood-disorder groups in the predicted direction (Brown et al., 1997), a pattern replicated on the DASS-21 (Antony et al., 1998, Table 4).
A note on the development sample: the original DASS development study (Lovibond & Lovibond, 1995) sampled 717 first-year psychology students, not a community cohort; broad general-adult DASS-21 norms come from Henry and Crawford (2005).
Research Evidence and Psychometric Properties
Reliability Evidence
Internal consistency, DASS-21: Cronbach’s α = 0.94 for Depression, 0.87 for Anxiety, and 0.91 for Stress in a combined clinical and non-clinical sample (Antony et al., 1998); α = 0.88, 0.82, and 0.90 respectively in 1,794 UK adults (Henry & Crawford, 2005)
Internal consistency, DASS-42 clinical sample: Depression α = 0.96, Anxiety α = 0.89, Stress α = 0.93; range across six diagnostic groups 0.88–0.96 (Brown et al., 1997, Table 1)
Test-retest reliability: 2-week retest for the 42-item DASS in a clinical subsample (n = 20): Depression r = 0.71, Anxiety r = 0.79, Stress r = 0.81 (Brown et al., 1997, Table 2). No DASS-21-specific retest coefficients are reported in these validation studies.
Factor Structure
Three-factor model: Three correlated factors reproduced by exploratory and confirmatory factor analysis in clinical samples for the 42-item DASS, with the three-factor model fitting significantly better than one- or two-factor alternatives (Brown et al., 1997, Table 5), and replicated for the DASS-21 (Antony et al., 1998; Norton, 2007, with good fit in every group, CFI 0.940–0.972)
Cleaner short-form structure: The DASS-21 showed lower interfactor correlations, higher mean loadings, and fewer cross-loading items than the DASS-42 (Antony et al., 1998)
General distress factor: In 1,794 UK adults, a simple correlated three-factor DASS-21 model fit relatively poorly (RCFI = 0.882), while a quadripartite model adding a general psychological distress factor fit well (RCFI = 0.941) (Henry & Crawford, 2005). Consistent with this, bifactor analyses in US undergraduate samples (N = 887 and N = 410) found a dominant general distress factor and emphasized the total score (Osman et al., 2012).
Cross-racial invariance: Item loadings were invariant across four US racial groups (African American, Asian, Caucasian, Hispanic/Latino), but factor covariances were not, so the constructs may be differentially inter-related across groups (Norton, 2007). This is a within-US racial comparison, not a cross-national study.
Convergent and Discriminant Validity
Convergent validity (DASS-21 unless noted):
Beck Depression Inventory: r = 0.79 with DASS-21 Depression (Antony et al., 1998, Table 3); the 42-item DASS Depression scale correlated r = 0.74 with the BDI (Lovibond & Lovibond, 1995)
Beck Anxiety Inventory: r = 0.85 with DASS-21 Anxiety (Antony et al., 1998, Table 3); the 42-item DASS Anxiety scale correlated r = 0.81 with the BAI (Lovibond & Lovibond, 1995)
PANAS Negative Affect: r = 0.72 with DASS Stress (Brown et al., 1997, Table 6; 42-item DASS)
Other distress measures: Convergent and discriminant validity against the BDI, BAI, PSWQ, PANAS, and clinician-rated severity (Brown et al., 1997, Table 6; 42-item DASS)
Discriminant validity:
Subscales differentiate clinical groups: Panic disorder scored highest on Anxiety, mood/major-depression groups highest on Depression, and GAD and mood disorders highest on Stress (Brown et al., 1997, Table 4; replicated on the DASS-21 in Antony et al., 1998, Table 4)
Factor distinctiveness: Moderate DASS-21 inter-subscale correlations: Depression–Anxiety r = 0.46, Stress–Depression r = 0.57, Stress–Anxiety r = 0.72 (Antony et al., 1998, Table 3)
Construct discrimination: The DASS separates depression, physical arousal, and tension/agitation more cleanly than two-factor measures such as the Beck inventories (Brown et al., 1997; Antony et al., 1998)
Validation Samples and Cross-Cultural Evidence
Clinical samples: Two independent clinical samples for the 42-item DASS, N = 437 and N = 241 (Brown et al., 1997); 258 patients across five DSM-IV diagnostic groups plus 49 nonclinical community volunteers for the DASS-21 (Antony et al., 1998)
Undergraduate samples: N = 895 US undergraduates across four racial groups (Norton, 2007); two further US undergraduate samples, N = 887 and N = 410 (Osman et al., 2012)
Across US racial groups: Acceptable-to-good internal consistency and invariant item loadings across African American, Asian, Caucasian, and Hispanic/Latino participants; factor intercorrelations varied (e.g., 0.92–0.97 among African American vs 0.71–0.80 among Caucasian participants), so cross-group comparisons warrant caution (Norton, 2007)
Language translations: Validated translations (Chinese, Spanish, and others) exist in the wider literature and are documented on the official DASS website
Usage Guidelines and Applications
Primary Clinical Applications
Initial screening for depression, anxiety, and stress in clinical settings
Assessment of the emotional distress profile across three dimensions in a single administration
Progress monitoring during psychological or pharmacological treatment
Treatment outcome evaluation at therapy conclusion or follow-up
Case conceptualization to understand presenting problems
Clinical Decision Support
Severity-based recommendations (suggested practice, not part of the instrument):
Normal scores (all subscales): Psychoeducation about maintaining mental health
Outcome measure: Primary or secondary endpoint in intervention trials
Screening tool: Include or exclude participants based on distress criteria
Administer the official item set: The severity cut-offs are calibrated for the exact 21 items listed above; substituting DASS-42 items invalidates the cut-off table
Cultural Considerations
Cross-racial evidence: Internal consistency and item loadings were consistent across four US racial groups, though factor interrelations varied (Norton, 2007)
Language translations: Available in multiple validated translations documented on the official DASS website
Cultural expression: Emotional distress manifestation may vary across cultures
Interpretation caution: Consider cultural context when applying cutoff scores
Limitations and Cautions
Cutoff guidelines: Severity ranges should inform, not replace, clinical judgment; the official DASS FAQ describes the labels as conventions rather than diagnostic thresholds
Self-report measure: Relies on accurate self-awareness and honest reporting
One-week timeframe: Captures recent symptoms but may miss important variations
Clinical diagnosis: Does not replace comprehensive diagnostic evaluation by trained professionals
Copyright and Usage Responsibility: Check that you have the proper rights and permissions to use this assessment tool in your research. This may include purchasing appropriate licenses, obtaining permissions from authors/copyright holders, or ensuring your usage falls within fair use guidelines.
The DASS-21 is in the public domain and free to use for clinical and research purposes. Permission is not required to use, copy, or administer it. The only restriction stated by the Psychology Foundation of Australia is that the scales themselves may not be sold; charging patients for an assessment that includes the DASS is permitted. The manual is sold separately.
Proper Attribution: When using or referencing this scale, cite the original development:
Lovibond, P. F., & Lovibond, S. H. (1995). The structure of negative emotional states: Comparison of the Depression Anxiety Stress Scales (DASS) with the Beck Depression and Anxiety Inventories. Behaviour Research and Therapy, 33(3), 335-343. https://doi.org/10.1016/0005-7967(94)00075-U
Lovibond, S. H., & Lovibond, P. F. (1995). Manual for the Depression Anxiety Stress Scales (2nd ed.). Sydney: Psychology Foundation of Australia. (no DOI) (Source of the DASS-21 item set and severity cut-offs.)
Lovibond, P. F., & Lovibond, S. H. (1995). The structure of negative emotional states: Comparison of the Depression Anxiety Stress Scales (DASS) with the Beck Depression and Anxiety Inventories. Behaviour Research and Therapy, 33(3), 335-343. https://doi.org/10.1016/0005-7967(94)00075-U
Lovibond, S. H., & Lovibond, P. F. (1995). Manual for the Depression Anxiety Stress Scales (2nd ed.). Sydney: Psychology Foundation of Australia. (no DOI)
Key Validation Studies:
Antony, M. M., Bieling, P. J., Cox, B. J., Enns, M. W., & Swinson, R. P. (1998). Psychometric properties of the 42-item and 21-item versions of the Depression Anxiety Stress Scales in clinical groups and a community sample. Psychological Assessment, 10(2), 176-181. https://doi.org/10.1037/1040-3590.10.2.176
Henry, J. D., & Crawford, J. R. (2005). The short-form version of the Depression Anxiety Stress Scales (DASS-21): Construct validity and normative data in a large non-clinical sample. British Journal of Clinical Psychology, 44(2), 227-239. https://doi.org/10.1348/014466505X29657
Factor Structure Research:
Brown, T. A., Chorpita, B. F., Korotitsch, W., & Barlow, D. H. (1997). Psychometric properties of the Depression Anxiety Stress Scales (DASS) in clinical samples. Behaviour Research and Therapy, 35(1), 79-89. https://doi.org/10.1016/S0005-7967(96)00068-X
Osman, A., Wong, J. L., Bagge, C. L., Freedenthal, S., Gutierrez, P. M., & Lozano, G. (2012). The Depression Anxiety Stress Scales-21 (DASS-21): Further examination of dimensions, scale reliability, and correlates. Journal of Clinical Psychology, 68(12), 1322-1338. https://doi.org/10.1002/jclp.21908 (US undergraduate samples.)
Cross-Group Validation:
Norton, P. J. (2007). Depression Anxiety and Stress Scales (DASS-21): Psychometric analysis across four racial groups. Anxiety, Stress & Coping, 20(3), 253-265. https://doi.org/10.1080/10615800701309279 (Four US racial groups in a university sample.)
Related Assessments: BDI-II: Beck Depression Inventory-II and BAI: Beck Anxiety Inventory (links added when their pages go live)
A distressed zebra overwhelmed by storm clouds and emotional turmoil — representing the depression, anxiety, and stress measured by the DASS-21
Frequently Asked Questions
What does the DASS-21 measure?
The DASS-21 measures three related dimensions of psychological distress: depression (dysphoric mood, hopelessness, and low positive affect), anxiety (autonomic arousal, situational anxiety, and subjective anxious affect), and stress (chronic non-specific arousal, tension, and difficulty relaxing). Each dimension is assessed with 7 items, and respondents rate how much each statement applied to them over the past week.
How is the DASS-21 scored?
Sum the 7 items for each subscale (Depression, Anxiety, Stress); no items are reverse-keyed. Multiply each sum by 2 so scores are comparable with DASS-42 normative data, then apply the published severity conventions from the DASS manual: for Depression, Normal 0-9, Mild 10-13, Moderate 14-20, Severe 21-27, Extremely Severe 28+, with parallel bands for Anxiety and Stress. The official DASS FAQ notes these labels are conventions for describing scores, not diagnostic thresholds.
Is the DASS-21 free to use?
Yes. The DASS-21 is in the public domain, and the Psychology Foundation of Australia states that no permission is required to use, copy, or administer it. The only stated restriction is that the scales themselves may not be sold; charging patients for an assessment that includes the DASS is permitted. The manual is sold separately.
How does the DASS-21 differ from the DASS-42?
The DASS-21 is the half-length short form of the original 42-item DASS, using 7 rather than 14 items per subscale; doubling the DASS-21 subscale sums makes scores comparable with DASS-42 norms and cut-offs. In the comparative validation study, the DASS-21 showed a cleaner factor structure than the full scale, with lower interfactor correlations and fewer cross-loading items (Antony et al., 1998).
How reliable is the DASS-21?
Internal consistency is high: Cronbach's alpha was 0.94 for Depression, 0.87 for Anxiety, and 0.91 for Stress in a combined clinical and non-clinical sample (Antony et al., 1998), and 0.88, 0.82, and 0.90 in a large UK adult sample (Henry & Crawford, 2005). Two-week test-retest coefficients of 0.71 to 0.81 have been reported for the 42-item DASS (Brown et al., 1997); no DASS-21-specific retest coefficient is reported in these validation studies.
Who can the DASS-21 be administered to?
The official DASS FAQ indicates the scale is usable from age 14 for respondents with typical language skills, and recommends the DASS-Y youth version for younger respondents. Published norms are for adults, including a general-population UK sample and US undergraduate samples, so scores from other groups should be interpreted with care.
