How is the BASDAI score calculated from the six questions?

The standard BASDAI formula is ((Q1+Q2+Q3) + (Q4+Q5+Q6)/2)/5, yielding a 0–10 score. Q1–Q3 are the first three questions, Q4–Q6 are the last three, and the second half is averaged before being added to the first half and divided by 5.

Do I need to provide a C-reactive protein (CRP) value to use these calculators?

BASDAI relies solely on six patient-reported symptom questions, so CRP is not needed. If you want a score that includes inflammatory markers, look for a tool that also calculates ASDAS, which adds CRP or patient global assessment to the BASDAI components.

Can I use a BASDAI calculator on a mobile phone or tablet?

All the calculators are web-based and work in mobile browsers. Slider-style inputs (as on Omni Calculator) tend to be more touch-friendly, while dropdown or numeric entry fields also function on phones but may require more tapping.

Is the BASDAI score meant to replace clinical judgment?

BASDAI is a patient-reported index for tracking disease activity over time, not a substitute for clinical judgment. Your rheumatologist will consider the BASDAI score along with physical exam, lab results, and other factors when making treatment decisions.

What does a BASDAI score above 4 mean?

A BASDAI score ≥4 is typically considered high disease activity, but interpretation should always be done in the context of your full clinical picture by your healthcare provider.

Medical & Clinical6 options compared

BASDAI Score Calculator

QxMD includes a BASDAI calculator that asks the canonical six BASDAI disease activity questions and computes the standardized score. The page includes formula context and references for clinical use. QxMD’s calculator access is generally offered free to users on web/app, without a mandatory paid subscription for this tool.

Other calculators

Editors’ Top PickBased on community votes

RheumCalc

rheumcalc.com

This tool provides an interactive BASDAI calculator using the standard symptom questions from the prior 7 days and co...

Open RheumCalc Read review →

Other OptionsRanked by votes

02
02
Spondylitis Association of America
spondylitis.org
This page provides a dedicated BASDAI Score Calculator for ankylosing spondylitis with the standard 6 BASDAI question...
Open site View details
03
03
QxMD Calculate
qxmd.com
QxMD includes a BASDAI calculator that asks the canonical six BASDAI disease activity questions and computes the stan...
Open site View details
04
04
MDApp
mdapp.co
MDApp offers a Bath Ankylosing Spondylitis Disease Activity Index calculator with all six input dimensions and immedi...
Open site View details
05
05
Omni Calculator
omnicalculator.com
BASDAI score calculator determines the effectiveness of the current treatment of patients with Ankylosing Spondylitis.
Open site View details
06
06
CReI (Collegio Reumatologi Italiani)
collegioreumatologi.it
CReI hosts a dedicated BASDAI Calculator page labeled 'Ankylosing Spondylitis Disease Activity Index' with six sympto...
Open site View details

Side by side

BASDAI Score Calculator options compared

Tool	Best for	Strengths	Limitations
RheumCalc rheumcalc.com	People who want BASDAI plus ASDAS on one page	Calculates BASDAI and ASDAS together Standard 7-day recall window Free without paid plan	Fewer unit options for morning stiffness duration
Spondylitis Association of America spondylitis.org	Users who want a dedicated BASDAI tool with interpretation guidance	Dedicated BASDAI calculator Includes interpretation guidance and formula details Free on public website	No ASDAS calculation included
QxMD Calculate qxmd.com	People who prefer the QxMD platform and want formula references	Canonical six BASDAI questions Includes formula context and references Free on web/app	Platform-specific UI may be less familiar to some users
MDApp mdapp.co	Users who want a free BASDAI calculator with optional account features	All six input dimensions Immediate result computation Clinical interpretation and references	Optional account features may require sign-up; live page excerpt not available
Omni Calculator omnicalculator.com	People who want a BASDAI calculator with visual slider inputs and inflammatory m	Slider-based 0–10 inputs for all symptoms Includes morning stiffness duration options Shares results easily	Fewer unit options for morning stiffness duration
CReI (Collegio Reumatologi Italiani) collegioreumatologi.it	Italian-speaking users or those who prefer the CReI interface	Standard BASDAI 0–10 response structure Publicly available online Free without paid plan	Interface in Italian only Community votes indicate lower usage

Buyer's guide

How to choose a basdai score calculator

When picking a BASDAI calculator, first confirm the tool uses the standard six questions covering fatigue, neck/back/hip pain, joint pain/swelling, tender area discomfort, morning stiffness intensity, and morning stiffness duration. The recall period should be the prior 7 days for consistency with the validated BASDAI protocol. If you also want ASDAS (which adds CRP or PGA into a combined score), choose a tool that includes that calculation on the same page. Otherwise a BASDAI-only calculator is sufficient for tracking symptom activity over time. Differences in input style — numeric entry versus sliders — and language of the interface are the main practical distinctions between options.

Questions

BASDAI Score Calculator FAQ

How is the BASDAI score calculated from the six questions?: The standard BASDAI formula is ((Q1+Q2+Q3) + (Q4+Q5+Q6)/2)/5, yielding a 0–10 score. Q1–Q3 are the first three questions, Q4–Q6 are the last three, and the second half is averaged before being added to the first half and divided by 5.
Do I need to provide a C-reactive protein (CRP) value to use these calculators?: BASDAI relies solely on six patient-reported symptom questions, so CRP is not needed. If you want a score that includes inflammatory markers, look for a tool that also calculates ASDAS, which adds CRP or patient global assessment to the BASDAI components.
Can I use a BASDAI calculator on a mobile phone or tablet?: All the calculators are web-based and work in mobile browsers. Slider-style inputs (as on Omni Calculator) tend to be more touch-friendly, while dropdown or numeric entry fields also function on phones but may require more tapping.
Is the BASDAI score meant to replace clinical judgment?: BASDAI is a patient-reported index for tracking disease activity over time, not a substitute for clinical judgment. Your rheumatologist will consider the BASDAI score along with physical exam, lab results, and other factors when making treatment decisions.
What does a BASDAI score above 4 mean?: A BASDAI score ≥4 is typically considered high disease activity, but interpretation should always be done in the context of your full clinical picture by your healthcare provider.

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