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Calcimator

FODMAP Elimination Planner Calculator

Plan a low-FODMAP diet protocol with elimination, reintroduction, and personalization phases. Estimates symptom improvement and creates a challenge schedule.

Inputs

Results

Elimination Phase (days)

28

Total Protocol (weeks)

10

Reintroduction Phase (days)36
Expected Symptom Reduction2.8
Expected Post-Elimination Score2.2
Days per FODMAP Group6
Reintroduction Duration (weeks)6
Estimated Safe Groups6
Long-Term Restriction (%)0%
Improvement Likelihood (%)84%
How to Use This Calculator
  1. Enter your Baseline Symptom Severity on a 0–10 scale and the Elimination Phase duration in weeks.
  2. Enter your Expected Compliance percentage and the number of FODMAP Groups to test.
  3. Enter Challenge Duration in days per group and Washout Period between challenges.
  4. Review Total Protocol Duration in weeks and the Reintroduction Phase schedule.
  5. Track Triggers Identified to build a personalized long-term low-FODMAP diet strategy.

What each input means

Baseline Symptom Severity (0–10)
Current IBS symptom severity: 0 = none, 5 = moderate, 10 = very severe.
Elimination Phase (weeks)
Duration of strict low-FODMAP elimination. Recommended: 2–6 weeks (max 8).
Expected Compliance (%)
Estimated adherence to the elimination diet. Higher compliance improves outcomes.
FODMAP Groups to Test (1–6)
Number of FODMAP groups to reintroduce: fructose, lactose, fructans, GOS, sorbitol, mannitol.
Challenge Duration (days)
Days per food challenge during reintroduction. Standard: 3 days with escalating dose.
Washout Between Challenges (days)
Return-to-baseline days between challenges. Minimum 2–3 days recommended.
Known Triggers Identified (0–6)
FODMAP groups already identified as triggers (for personalization phase planning).

What each result means

Elimination Phase (days)
Duration of strict elimination in days.
Reintroduction Phase (days)
Total days needed for all food challenges and washouts.
Total Protocol (weeks)
Total weeks for elimination + reintroduction phases.
Expected Symptom Reduction
Estimated symptom score reduction (out of 10) based on compliance.
Expected Post-Elimination Score
Predicted symptom severity after elimination phase.
Days per FODMAP Group
Challenge + washout days per group tested.
Reintroduction Duration (weeks)
Total weeks for the reintroduction phase alone.
Estimated Safe Groups
FODMAP groups likely tolerated (tested minus triggers).
Long-Term Restriction (%)
Estimated percentage of FODMAP foods remaining restricted after personalization.
Improvement Likelihood (%)
Estimated probability of meaningful symptom improvement (literature: 50–80%).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Baseline Symptom Severity (0–10) = 5, Elimination Phase (weeks) = 4, Expected Compliance (%) = 80, FODMAP Groups to Test (1–6) = 6 = 7 input(s) provided
  2. Calculate Elimination Phase
    Elimination Phase
    28 = 28
  3. Calculate Total Protocol
    Total Protocol = ceil(totalDays / 7)
    10 = 10
  4. Calculate Reintroduction Phase
    Reintroduction Phase
    36 = 36
  5. Calculate Expected Symptom Reduction
    Expected Symptom Reduction = round(
    2.8 = 2.8

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