Crohn's Disease Activity Index (CDAI)
Enter 8 clinical variables over the past 7 days to calculate your CDAI score and determine Crohn's disease activity level.
Enter 7-Day Clinical Variables
Record values from the past 7 consecutive days. All fields are required for an accurate CDAI score.
Count every loose or liquid stool over the past 7 days. Weight factor: ×2
Rate each day: 0 = none, 1 = mild, 2 = moderate, 3 = severe. Enter the 7-day sum (0-21). Weight factor: ×5
Rate each day: 0 = generally well, 1 = slightly below par, 2 = poor, 3 = very poor, 4 = terrible. Enter the 7-day sum (0-28). Weight factor: ×7
Check each complication currently present. Each item adds 1 point × 20. Weight factor: ×20 per item
Used loperamide, opiates, or similar antidiarrheals in the past 7 days? Weight factor: ×30
Assessed by a clinician on physical examination. Weight factor: ×10
The calculator uses the expected normal (47% for men, 42% for women). Weight factor: ×6 on the deviation.
Enter standard weight and current weight. Weight factor: ×1 on percent deviation below standard (negative values enter as 0).
Fill in all variables and press
Calculate CDAI Score
CDAI Score
Score Breakdown
CDAI Classification
| Score Range | Activity Level |
|---|---|
| < 150 | Remission |
| 150 – 219 | Mildly Active |
| 220 – 450 | Moderately Active |
| > 450 | Severely Active |
Summary
Enter 8 clinical variables over the past 7 days to calculate your CDAI score and determine Crohn's disease activity level.
How it works
- Record each of the 8 clinical variables over the past 7 consecutive days.
- Enter the 7-day totals or select the appropriate category for each variable.
- The calculator multiplies each variable by its predefined weighting factor.
- All weighted values are summed to produce the total CDAI score.
- The score is classified as remission (<150), mild (150-219), moderate (220-450), or severe (>450).
- Use the result alongside your physician's clinical assessment to guide treatment decisions.
Use cases
- Monitor disease activity trends over time in Crohn's patients.
- Assess eligibility for clinical trials requiring a baseline CDAI score.
- Evaluate response to biologic or immunosuppressive therapy.
- Determine whether a patient meets the threshold for clinical remission.
- Guide shared decision-making between patients and gastroenterologists.
- Standardize disease activity reporting across care teams.