Kessler Psychological Distress Scale (K10) Assessment
Measure distress frequency over the past four weeks with K10, compare two published band guides, and review the complete response pattern.{{ summaryTitle }}
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Psychological distress is a broad pattern of emotional strain rather than the name of one disorder. Feeling nervous, unable to calm down, restless, hopeless, depressed, or unable to summon effort can arise from mental health conditions, physical illness, pain, sleep loss, substance use, medication effects, grief, or severe life pressure. A frequency score can show how much of that burden has been present without identifying its cause.
The Kessler Psychological Distress Scale (K10) asks how often 10 experiences occurred during the past four weeks. Each response runs from none of the time to all of the time. The result is useful for screening, population surveys, personal monitoring, and preparation for a qualified conversation because it summarizes one consistent recall period in a repeatable way.
Frequency and impact are related but different. The K10 does not directly measure work performance, relationships, sleep, self-care, or safety, even though distress may affect them. Two people with the same total can have different difficulties and need different support. Reviewing the individual answers and changes in daily functioning prevents the total from becoming a misleading shorthand.
Published reporting guides can attach different labels to the same raw total. One common guide uses Low, Mild, Moderate, and Severe bands. An Australian population guide uses Low, Moderate, High, and Very high with different boundaries. The number does not change when the guide changes, so a band should never be quoted without its guide name.
Neither guide provides a stand-alone diagnosis, prognosis, treatment plan, or safety clearance. Language, culture, willingness to disclose, recent events, and the circumstances of administration can affect responses. Repeated results are most comparable when the English form, four-week period, response choices, and administration setting remain consistent.
K10 does not directly ask about suicidal thoughts or immediate danger. Seek urgent local help for thoughts of suicide or self-harm, a life-threatening situation, or an inability to stay safe, regardless of the total.
How to Use This Tool:
Keep all answers within the same previous-four-weeks period and choose the frequency that actually occurred, not the answer that feels most socially acceptable.
- Begin the assessment and answer each experience from None of the time through All of the time.
- Follow the dependent questions as shown. When nervousness is None of the time, the unable-to-calm-down follow-up is recorded the same way; the corresponding rule also applies to restlessness and inability to sit still.
- Complete the required path, then read the K10 total with both published guide labels. Keep the guide name beside any band you record or discuss.
- Use Answer review to check the response pattern and consider changes in functioning or safety that the total does not measure.
Interpreting Results:
The K10 total is an integer from 10 to 50. Higher totals mean that nonspecific distress experiences were reported more often during the past four weeks. They do not identify a particular condition or separate emotional, medical, social, and situational causes.
A total of 22 shows why guide names matter. It is Mild under the common four-band guide and High under the Australian population guide. Both labels describe the same 22-point response pattern; the difference comes only from the published boundaries.
Use the band as a prompt for proportionate follow-up, then consider persistence, worsening, functioning, health context, and the individual answers. Item groupings can help organize a discussion, but they are not official diagnostic subscores. Immediate safety concerns always take priority over either guide.
Technical Details:
K10 uses 10 equally weighted frequency items. Every included response contributes an integer from 1 to 5, and larger contributions always mean greater frequency of nonspecific distress. No items are reverse-scored.
Formula Core
The K10 total is the direct sum of the 10 response contributions.
| Response | Contribution |
|---|---|
| None of the time | 1 |
| A little of the time | 2 |
| Some of the time | 3 |
| Most of the time | 4 |
| All of the time | 5 |
K is the total and ri is the contribution from item i. The complete range is 10 to 50 points, and the sum needs no averaging or rounding. If item 2 or item 5 is None of the time, its dependent follow-up is also recorded as None of the time and contributes 1 point.
Rule Core
The same value of K is evaluated against both complete sets of inclusive boundaries.
| Guide | Band | Inclusive total |
|---|---|---|
| Common four-band | Low | 10 to 19 |
| Common four-band | Mild | 20 to 24 |
| Common four-band | Moderate | 25 to 29 |
| Common four-band | Severe | 30 to 50 |
| Australian population | Low | 10 to 15 |
| Australian population | Moderate | 16 to 21 |
| Australian population | High | 22 to 29 |
| Australian population | Very high | 30 to 50 |
For example, contributions of 2, 3, 1, 2, 3, 1, 2, 2, 3, and 3 sum to 22. That substitution produces one fixed total and the two different guide labels described above.
Limits, Safety, and Privacy:
K10 is a screening measure of frequency, not a diagnostic assessment. It cannot establish the cause of distress, select treatment, predict an outcome, determine fitness or eligibility, or confirm that immediate risk is absent.
- Responses remain in the current browser session during ordinary use, with no automatic URL syncing.
- A copied result link contains all 10 raw responses in a compact URL code. It is not encrypted or access-controlled.
- Starting over clears the in-memory session and removes the shared response fragment.
- Seek urgent local support for suicidal thoughts, self-harm urges, immediate danger, or an inability to stay safe without waiting for a K10 band.
References:
- K10 and K6 Scales, National Comorbidity Survey, Harvard Medical School.
- K-10 score of psychological distress, Australian Institute of Health and Welfare METEOR, 2015.
- National Health Survey Users’ Guide: Kessler Psychological Distress Scale-10, Australian Bureau of Statistics, 2018.
- Screening for serious mental illness in the general population, Archives of General Psychiatry, 2003.
- My Mental Health: Do I Need Help?, National Institute of Mental Health, revised 2025.