DASS-21 (Depression Anxiety Stress Scales): Items, Scoring, and Interpretation

If you have ever taken a research methods course, you have almost certainly met the DASS-21. It is the short questionnaire that turns one page of statements into three separate scores — one for depression, one for anxiety, and one for stress. Students love it because it is free, takes about five minutes, and measures three things at once. Supervisors love it because it is well validated and widely recognised. This guide covers DASS-21 scoring and interpretation from start to finish: what the scale measures, the 21 items, the 0–3 response format, the scoring rules, the severity cut-offs, and how to cite it in your thesis.

What Is the DASS-21?

The Depression Anxiety Stress Scales (DASS) were developed by Sydney H. Lovibond and Peter F. Lovibond at the University of New South Wales and first published in 1995. The original DASS has 42 items — 14 for each of the three emotional states it measures. The DASS-21 is the short form: it keeps the seven best-performing items from each subscale, giving 21 items in total.

The scale was designed to measure three related but distinct negative emotional states — depression, anxiety, and stress — as experienced over the past week. It is a self-report questionnaire: respondents read a statement and rate how much it applied to them. Because it is short, free, and easy to score, it has become one of the most widely used screening instruments in student research, especially in psychology, nursing, medicine, and education theses.

One thing to understand before anything else: the three subscales are scored separately. There is no single “DASS-21 total score”. A participant gets a depression score, an anxiety score, and a stress score, and you report and interpret each one on its own.

What Does the DASS-21 Measure?

Each subscale captures a different facet of negative emotional experience. The three are related — people who score high on one often score high on the others — but factor analysis consistently shows they are three distinguishable dimensions, not one lump of “feeling bad”.

Depression

The depression subscale measures low mood, loss of interest and pleasure, hopelessness, and a sense of worthlessness. Its seven items tap dysphoria, hopelessness, devaluation of life, self-deprecation, lack of interest or involvement, anhedonia (inability to feel pleasure), and inertia. Example items include “I couldn’t seem to experience any positive feeling at all” and “I felt that I had nothing to look forward to.”

Anxiety

The anxiety subscale measures autonomic arousal, skeletal muscle tension, situational anxiety, and the subjective experience of anxious affect — in plain English, the physical side of anxiety. Its items cover dry mouth, breathing difficulty, trembling, racing heart, feeling scared without good reason, and panic-type symptoms. Example items include “I was aware of dryness of my mouth” and “I felt scared without any good reason.”

Stress

The stress subscale measures difficulty relaxing, nervous arousal, being easily upset or agitated, irritability, over-reactivity, and impatience. It captures the tense, wound-up, easily irritated state that comes with chronic pressure — distinct from the low mood of depression and the fear of anxiety. Example items include “I found it hard to wind down” and “I found myself getting agitated.”

The 21 Items at a Glance

The table below shows which items belong to each subscale. The item numbers refer to the order of the items in the standard DASS-21 questionnaire — keep them in that order when you administer the scale, because the numbering is part of the scoring key.

Response Format: How Respondents Answer

Each item is a statement, and the respondent rates how much it applied to them over the past week on a four-point 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 the time
• 3 — Applied to me very much, or most of the time

Two details matter here. First, the time frame is the past week, not “in general” — the DASS-21 measures current states, not personality traits, so a score reflects how someone has felt recently. Second, every item is scored in the same direction: a higher number always means more of that symptom. The DASS-21 has no reverse-scored items, so there is nothing to flip before you add the scores up. That is a pleasant surprise for anyone who has wrestled with reverse scoring on other scales.

How to Score the DASS-21 (Step by Step)

Scoring takes three steps, and the second one is the step almost everyone gets wrong the first time.

Step 1: Add up the seven items in each subscale. Using the item numbers in the table above, sum the depression items (3, 5, 10, 13, 16, 17, 21), the anxiety items (2, 4, 7, 9, 15, 19, 20), and the stress items (1, 6, 8, 11, 12, 14, 18). Each raw subscale total runs from 0 to 21.

Step 2: Multiply each subscale total by 2. Because the DASS-21 is the short form of the 42-item DASS, each subscale score is doubled so it can be read against the same norms and severity bands as the full version. Each final subscale score therefore runs from 0 to 42. Multiply the subscale sums — not the total of all 21 items.

Step 3: Compare each doubled score with the severity bands in the table below, reading each subscale against its own column. The bands are different for depression, anxiety, and stress, so do not use one column for all three.

Worked Example

Imagine a participant, Sara, completes the DASS-21. Her depression items add up to 8. Her anxiety items add up to 5, and her stress items add up to 11. Doubled, her scores are: Depression 16, Anxiety 10, Stress 22. Against the bands below, all three fall in the Moderate range. When you write this up, you report three separate results — for example, “the participant scored 16 (moderate) on depression, 10 (moderate) on anxiety, and 22 (moderate) on stress” — never a single combined number.

DASS-21 Severity Cut-Offs (Interpretation Table)

These bands come from the DASS manual (Lovibond & Lovibond, 1995) and are based on normative data from large non-clinical samples. They describe where a score sits relative to the general population. They are severity labels, not diagnoses — a score in the “severe” depression range means the person is reporting symptoms at a level consistent with severe depression; it does not by itself confirm a diagnosis of major depressive disorder.

Notice that the anxiety cut-offs start lower than the others. That is deliberate: the anxiety subscale focuses on physical arousal symptoms, which are more discriminating at lower levels, so a smaller score already signals an above-average level of anxiety.

How to Interpret DASS-21 Scores

Read each subscale on its own. A person can be Normal on depression and Severe on anxiety, or the other way round. That pattern is often the most interesting finding in a study — for example, a sample of exam-season students might show elevated stress with normal depression.

Know what the labels mean in practice. “Normal” means the score falls within the typical range for the general population. “Mild” means slightly above average — noticeable, but not necessarily a problem. “Moderate” means clearly above average and worth noting in your discussion. “Severe” and “Extremely Severe” mean the person is reporting symptoms at a level that, in a clinical setting, would prompt further assessment. In a research study, that is a finding to report carefully, not a label to attach to a participant.

Never use a DASS-21 score to diagnose anyone. The scale is a screening and research instrument, not a diagnostic tool. Only a qualified clinician, using a full assessment, can diagnose depression or an anxiety disorder. If a participant scores in the severe range, follow your study’s ethics protocol — most protocols require signposting support services — and discuss the result with your supervisor.

When comparing groups, report means and standard deviations for each subscale separately, and check your data’s distribution before choosing a test: DASS-21 scores in general-population samples are typically skewed, so non-parametric tests or a transformation are often appropriate. Report the exact version you used (DASS-21, not DASS-42) and state whether you doubled the scores, so your reader can compare your numbers with the published bands.

Reliability and Validity: What the Evidence Says

The DASS-21 is one of the best-validated short scales available, which is a large part of why supervisors keep recommending it. In a large non-clinical sample of 1,794 adults, Henry and Crawford (2005) reported Cronbach’s alpha of .88 for depression, .82 for anxiety, and .90 for stress, and confirmed the three-factor structure. Antony and colleagues (1998) reported alphas of .94, .87, and .91 in clinical and non-clinical samples. In plain terms, each subscale hangs together well internally, and the three subscales measure three distinguishable things — the depression and anxiety subscales correlate with each other, but factor analysis consistently recovers three separate factors.

The scale also shows good convergent validity: depression scores track the Beck Depression Inventory, and anxiety scores track the Beck Anxiety Inventory (Lovibond & Lovibond, 1995). For a student thesis, that combination — strong internal consistency, a confirmed factor structure, and good agreement with established measures — is exactly what an examiner wants to see in a methods section.

DASS-21 vs DASS-42 vs PHQ-9 and GAD-7

Students often ask which scale to pick. The honest answer is that it depends on your research question:

Two practical notes. First, the DASS-21 has no item about self-harm, while the PHQ-9 does — if your study needs to screen for self-harm risk, the DASS-21 alone is not enough. Second, if you only need one construct, a single-construct scale like the PHQ-9 or GAD-7 is usually cleaner than pulling one subscale out of the DASS-21. The DASS-21 earns its place when you genuinely want all three.

5 Common Mistakes When Scoring the DASS-21

1. Forgetting to multiply by 2. This is the classic error. The raw subscale total runs 0–21, but the published severity bands assume the doubled score (0–42). A raw depression score of 12 looks “Mild” if you forget the doubling — doubled to 24, it is actually “Severe”. Always double first, then read the bands.

2. Adding all 21 items into one total. There is no total DASS-21 score. Summing everything produces a meaningless number that no published norm can interpret. Keep the three subscales separate from the first addition to the final write-up.

3. Reading raw scores against the published bands. Same error as mistake 1 from the other direction: the bands only work on doubled scores. If your spreadsheet shows subscale totals of 0–21, you have not finished scoring yet.

4. Treating a severity label as a diagnosis. “Severe” on the DASS-21 is a description of symptom level relative to the general population, not a clinical diagnosis. Write about scores, not about participants “having depression”.

5. Reverse-scoring items that don’t need it. Some scales mix positively and negatively worded items, and students reflexively flip some of them. The DASS-21 has no reverse-scored items — every item is scored exactly as answered. If you find yourself reversing anything, you are working from the wrong scoring key.

How to Cite the DASS-21

Cite the manual as the source of the scale, and the 1995 validation paper if you discuss its psychometric properties:

Lovibond, S. H., & Lovibond, P. F. (1995). Manual for the Depression Anxiety Stress Scales (2nd ed.). Psychology Foundation of Australia.

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.

The scale itself is freely available from the official DASS website hosted by the University of New South Wales — download it there rather than from a random re-upload, so you know you have the standard wording and item order. In your methods section, name the version (“DASS-21”), the time frame (“over the past week”), and your scoring procedure (summed per subscale, multiplied by 2, interpreted against the Lovibond and Lovibond severity bands).

Frequently Asked Questions

Is the DASS-21 free to use?
Yes. The DASS is freely available from the official DASS website for research and clinical use, and the authors do not charge for it. Always download the scale from the official source so you have the standard wording.

Can I use the DASS-21 with children or teenagers?
The DASS-21 was developed and validated with adults. If your sample is under 18, look for a measure validated for that age group rather than assuming the adult norms apply.

What is a “good” DASS-21 score?
There is no universal good score — it depends on your research question. In a general-population sample, most people fall in the Normal range on all three subscales. In a clinical sample, higher scores are expected. Report your sample’s means against the published bands and let the comparison do the talking.

Should I use the DASS-21 or the full DASS-42?
Use the DASS-21 when you need a quick screen of all three states, when your questionnaire battery is already long, or when participant time is limited. Use the DASS-42 when you need finer measurement within each subscale. Both use the same severity bands, because the DASS-21 scores are doubled to match the full version.

Do I need permission to use the DASS-21 in my thesis?
The scale is freely available for research use from the official DASS website, and the authors do not require a permission fee. Cite the manual properly, and check your university’s ethics requirements — your ethics committee may still want the scale included in your application.

Key Takeaways

• The DASS-21 is a 21-item short form of the DASS-42, measuring depression, anxiety, and stress over the past week with 7 items per subscale.
• Each item is rated 0–3, and there are no reverse-scored items.
• Score each subscale separately: sum its 7 items, multiply by 2, then read the doubled score against that subscale’s severity bands.
• Depression: Normal 0–9, Mild 10–13, Moderate 14–20, Severe 21–27, Extremely Severe 28+. Anxiety: Normal 0–7, Mild 8–9, Moderate 10–14, Severe 15–19, Extremely Severe 20+. Stress: Normal 0–14, Mild 15–18, Moderate 19–25, Severe 26–33, Extremely Severe 34+.
• Severity labels describe symptom levels relative to the general population — they are not diagnoses.
• Cite Lovibond & Lovibond (1995) and download the scale from the official DASS website.