BASDAI Score Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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Axial spondyloarthritis can feel different from one day to the next, which is why a repeatable symptom score can be useful. BASDAI summarizes six patient-reported areas into one 0–10 disease-activity number.

What this calculator does

The calculator asks about fatigue, neck/back/hip pain, peripheral joint pain or swelling, tender areas, morning-stiffness intensity and morning-stiffness duration. Each item is rated from 0 to 10. The result is a BASDAI score; it does not use blood tests, imaging or a clinician’s examination.

How to use it

Rate each question for the period your clinician or study protocol asks you to consider, using the same scale consistently. For morning stiffness, answer both intensity and duration because those two questions are averaged before the final score is calculated.

How the calculation works

BASDAI = [Q1 + Q2 + Q3 + Q4 + (Q5 + Q6)/2] ÷ 5. This gives the morning-stiffness domain the same overall weight as each of the first four domains. The final score ranges from 0 to 10, with higher values reflecting more patient-reported disease activity.

Example

If all six responses are 0, as in the default demonstration, the morning-stiffness average is 0 and the BASDAI is 0/10. If the first four questions were 4 and both stiffness questions were 4, the formula would produce 4/10.

How to interpret the result

A BASDAI of 4 or more is often used as a marker of higher or active disease in research and treatment pathways, but it is not a diagnosis and does not prove that symptoms are caused by inflammation. Trends over time, treatment response and the full clinical picture are usually more informative than a single value.

Limitations and notes

BASDAI is entirely patient reported and can be influenced by pain from other causes, fatigue, sleep and comorbid conditions. It does not include CRP/ESR or imaging. Use the score as a structured symptom measure and discuss meaningful changes with a rheumatology professional rather than treating the cutoff as an absolute rule.