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CDAI Online Calculator

Crohn's Disease Activity Index
CDAI = 2x1 + 5x2 + 7x3 + 20x4 + 30x5 + 10x6 + 6x7 + (weight factor)8

The purpose of this crohn's disease activity index (CDAI) calculator is to gauge the progress or lack of progress for people with crohn's disease. The reference article says "generally speaking, CDAI scores below 150 indicate a better prognosis than higher scores." (See Reference at bottom).

However, since the original study, other researchers use a 'subjective value' of 200 to 250. Therefore, this just reinforces the fact that the purpose is to gauge Your Progress i.e. compare readings from one week to the next to determine if you are getting better or worst. Bottom line is that you need to use the CDAI on a regular basis and view it as a personal gauge. Watch for changes in your score (your gauge).

This 'indicator' does NOT predicts the outcome of the disease. Crohn's disease conditions vary for each patient. This calculator is only a 'gauge' of progress i.e. not a prognosis tool!

1. Number of liquid or very soft stools in one week

Total For One Week

2. Sum of seven daily abdominal pain ratings:
    (0=none, 1=mild, 2=moderate, 3=severe)

Overall Rating: 0     1     2     3

3. Sum of seven daily ratings of general well-being:
    (0=well, 1=slightly below par, 2=poor, 3=very poor, 4=terrible)

Rating: 0     1     2     3     4  

4. Symptoms or findings presumed related to Crohn's disease
    Select each set corresponding to patient's symptoms:
arthritis or arthralgia
iritis or uveitis
erythema nodosum, pyoderma gangrenosum, apththous stomatitis
anal fissure, fistula or perirectal abscess
other bowel-related fistula
febrile (fever) episode over 100 degrees during past week

5. Taking Lomotil or opiates for diarrhea

No     Yes

6. Abnormal mass
    0=none; 0.4=questionable; 1=present

None     Questionable     Present    

7. Hematocrit [ (Typical - Current) x 6 ]
Normal average:     For Male = 47     For Female = 42
VIP: Skip this section if typical and current are unknown.

Enter 'YOUR' typical value and the current value
If you want to include this calculation

Male Female
Enter Typical = Current =

8. 100 x [(standard weight-actual body weight) / standard weight]

Skip this section unless weight 'changes related' to crohn's are known !
The purpose is to check for weight change = change in conditions.
For example: Weight loss such as that caused by dehydration.

Standard Weight
Actual Weight

Source: "Natural Approach to Inflammatory Bowel Disease," American Journal of Natural Medicine, July/Aug 1997, referring to the index developed as a monitoring tool in the National Cooperative Crohn's Disease Study (Best WR, et al., "Development of a Crohn's disease activity index." Gastroenterology 70:439-444, 1976.

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