CDAI / SDAI
CDAI / SDAI: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.
CDAI / SDAI
Tender joint count (of 28)
Swollen joint count (of 28)
Patient global assessment (0–10)
Physician global assessment (0–10)
C-reactive proteinmg/L
CDAI
15
RA activity
Moderate
SDAI
16.5
SDAI activity
Moderate
More about: CDAI / SDAI
What it calculates
The “CDAI / SDAI” calculator computes CDAI from 5 parameters: tender joint count (of 28), swollen joint count (of 28), patient global assessment (0–10), physician global assessment (0–10), c-reactive protein (mg/L).
Used by professionals and patients to assess health metrics, dosages, and risks.
Example calculation
With parameters Tender joint count (of 28) = 5, Swollen joint count (of 28) = 3, Patient global assessment (0–10) = 4, Physician global assessment (0–10) = 3, C-reactive protein = 15 mg/L the result is 15 (In SDAI, CRP is converted to mg/dL).
How to use
- Enter tender joint count (of 28), swollen joint count (of 28), patient global assessment (0–10), physician global assessment (0–10) and c-reactive protein — each field above is adjustable with a slider.
- CDAI is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.
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