K10 scoring: calculate your total and understand the 10–50 bands
How do you calculate a K10 score?
Check that all ten items have one response scored from 1 to 5, then add the values once. There is no doubling step, no reverse-scoring, and no subscale grouping.
Take a fictional set of responses: 3, 4, 2, 3, 4, 3, 2, 3, 4, 2. The calculation is 3 + 4 + 2 + 3 + 4 + 3 + 2 + 3 + 4 + 2 = 30, which falls at the bottom of the highest band.
A total below 10 or above 50 indicates an input problem. The most common cause is a form that scored items 0 to 4 while the reader expected 1 to 5.
What are the K10 score ranges?
These are the interpretation bands used by the Australian Bureau of Statistics for the 10-to-50 version, and the ones the LuriaLab assessment reports. The labels describe reported distress over the period. They are not diagnoses and they do not name a condition.
You will also encounter a different set of cut-points on some sites and in some services, commonly 10–19, 20–24, 25–29, and 30–50. Both groupings are in genuine use, so a total near a boundary can be labelled differently depending on whose table you read. Check which one produced any label you are given.
| Total | ABS category | What it describes |
|---|---|---|
| 10–15 | Low distress | Little or no distress reported over the last four weeks. |
| 16–21 | Moderate distress | A noticeable load across the period. |
| 22–29 | High distress | Several feelings occurred often enough to look at closely. |
| 30–50 | Very high distress | The period has been heavy. This is a reason to talk to someone. |
Why do some sources show a 0 to 40 range?
Because they use the other scoring convention. Scoring each item 0 to 4 rather than 1 to 5 produces a total exactly ten points lower from identical answers. The United States National Health Interview Survey, where the K10 originated, uses the 0-to-4 form.
The two are equivalent once you know which you have: a 10-to-50 total minus ten gives the 0-to-40 total. What you must not do is read one against the other’s bands. A total of 28 is high distress on the 10-to-50 scale, but the same answers give 18 on the 0-to-40 scale.
This is the single most common K10 misreading online. Before comparing your number with any table, confirm which convention produced it.
What does a score of 15, 21, or 29 mean?
Endpoints belong to the band shown: 15 sits in 10–15, 21 in 16–21, and 29 in 22–29. The next band begins at 16, 22, or 30 respectively.
Moving from 21 to 22 changes a label, but one point is not a boundary in your experience. A single item answered one step higher can move you across a line without anything meaningful having changed.
The bands are also unequal in width. The lowest two span six points each, while the highest spans twenty-one, so the same point change means different things in different parts of the range.
Is my K10 score a percentage?
No. A total of 25 out of 50 does not mean you are 50% distressed or have a 50% chance of a disorder. It is a sum of ten responses on this questionnaire, and on the 10-to-50 version the lowest possible score is 10 rather than 0, so the arithmetic does not even start at zero.
It is also not comparable point for point with the GAD-7, PSS-10, ISI, DASS-21, or BAI. Do not rank your concerns by which questionnaire produced the largest number.
Does a low score mean nothing is wrong?
No. Ten questions over four weeks cannot capture everything, and the K10 asks about a specific set of feelings. Difficulties that do not appear in those items — sleep, physical symptoms, a specific fear, a situation you are avoiding — can be entirely absent from your total.
A low total also cannot rule out a condition. Screening tools miss cases, and this one is deliberately broad rather than sensitive to any particular presentation.
When discussing a result, pair the number with a sentence: “My total was 13, but I have stopped going to lectures.” The second half is the part that matters.
This page is educational. A questionnaire score cannot establish a diagnosis or explain the cause of your symptoms. If you are struggling, speak with a counselor or healthcare professional, whatever your score.
Read how to ask for support or find a helpline in your country.