Low-FODMAP Portions Calculator

Estimate portions that keep FODMAP load within your chosen limits customize category thresholds explore example foods and add your own entries see green amber or red status for a target serving export results to CSV or PDF use this educational tool alongside professional guidance and personal tolerance tracking over time for better dietary decisions

Category thresholds (example values)

Set maximum tolerated load per category per serving. Values below are illustrative only.

Shareable URL

Encodes thresholds foods and target using safe compression. Anyone with the link can load the same view.

Portion safety and max-safe estimates
# Food Categories per 100g Max safe portion (g) Target serving (g) Status Notes

Example nutrient values are placeholders for demonstration and not authoritative. Replace with values from trusted databases or clinical guidance.

Add custom food
Formula used

Each food can contain one or more FODMAP categories. Provide approximate content in grams per 100 g of food. For a category c with content content_c_per100 and a user-set threshold threshold_c (both in grams), the maximum safe portion is:

portion_c = threshold_c / (content_c_per100 / 100)
max_safe_portion = min over all categories with content > 0 of portion_c

If a food has no values or all thresholds are zero, the calculator cannot estimate a safe portion. Status for a target serving is computed relative to max_safe_portion using the simple traffic-light rule displayed above.

  • Green: target ≤ 80% of max safe portion
  • Amber: near the threshold (≈ 80–120%)
  • Red: exceeds the threshold (> 120%)

This tool is educational. Actual tolerance varies widely between individuals. Always verify data with authoritative sources and seek professional advice when needed.

How to use this calculator
  1. Set example category thresholds or enter your own targets according to guidance from a clinician or trusted database.
  2. Adjust the target serving size to evaluate.
  3. Review the example foods. Replace placeholder values with data from reliable sources, or add new foods via the form.
  4. Check the status color for your target serving and the calculator’s estimated maximum safe portion.
  5. Export the table to CSV or PDF, or get a shareable URL that preserves your inputs.
  6. Use the filter to quickly search by food or FODMAP category.
FAQs

Thresholds in this tool are examples only. People set personal targets based on clinical advice and trusted resources. Replace the example values with guidance appropriate for your situation.

No. They are placeholders to demonstrate calculations. Always consult authoritative references for precise amounts and consider personal tolerance during reintroduction phases.

Yes. Enter grams per 100 g for any categories that apply. The calculator takes the most limiting category to estimate the maximum safe portion.

Green suggests your target serving is comfortably below the example threshold. Amber is near the threshold. Red indicates your target likely exceeds it given the entered values.

Accuracy depends entirely on the quality of inputs and the suitability of thresholds for you. This is an educational calculator and not a diagnostic tool.

Yes. The calculator stores thresholds and custom foods in your browser’s local storage. Use Export CSV, Export JSON, or the Shareable URL for backup.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.