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Low FODMAP Portion Calculator

Work out low fodmap portion instantly with clear inputs, formula shown and shareable results.

About Low FODMAP Portion Calculator

Compares a planned portion, and the day's total, with the published low FODMAP serving size, since FODMAP load accumulates across the day.

Formula

FODMAP load

Portion ratio = planned portion / published safe serving; daily load = portion ratio x servings that day

Worked example

With the default values below, Low FODMAP Portion Calculator returns Portion as a multiple of the safe serving of 2.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Planned portionaccepts 1–1,000 g
80 g
Published low FODMAP servingaccepts 1–1,000 g
40 g
Servings planned that dayaccepts 1–10
2

Results

Portion as a multiple of the safe serving
2.000
Daily load as a multiple of the safe serving
4.000
Verdict
Above the low FODMAP serving — reduce the portion or spread it across days
Whole safe portions within one serving
0.00

Step by step

  1. 1Values used
  2. 2FODMAP load
  3. 3Portion as a multiple of the safe serving= 2.000
  4. 4Daily load as a multiple of the safe serving= 4.000
  5. 5Verdict= Above the low FODMAP serving — reduce the portion or spread it across days
  6. 6Whole safe portions within one serving= 0.00

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why does load accumulate?

FODMAPs are additive within a few hours, so several borderline servings can together exceed the threshold.

Is the elimination diet permanent?

No. It runs two to six weeks and is followed by structured reintroduction to identify personal triggers.

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