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Fibre Requirement Calculator

Work out fibre requirement instantly with clear inputs, formula shown and shareable results.

About Fibre Requirement Calculator

Applies the 14 grams per 1,000 kcal dietary guideline, or the flat 30 gram UK reference, and compares it with current intake.

Formula

Fibre target

Target = energy intake / 1000 x 14 g, or a flat 30 g a day; fibre density = intake / energy x 1000

Worked example

With the default values below, Fibre Requirement Calculator returns Daily fibre target of 33.6. Change any input above and every figure here is recalculated in your browser.

Inputs used

Daily energy intakeaccepts 800–6,000 kcal
2,400 kcal
Current fibre intakeaccepts 0–100 g
18 g
Basisone of 14 g per 1,000 kcal (DGA), 30 g a day (UK reference)
14 g per 1,000 kcal (DGA)

Results

Daily fibre target
33.6 g
Shortfall to make up
15.6 g
Share of target currently met
53.6%
Current fibre density
7.50 g per 1000 kcal

Step by step

  1. 1Values used
  2. 2Fibre target
  3. 3Daily fibre target= 33.6 g
  4. 4Shortfall to make up= 15.6 g
  5. 5Share of target currently met= 53.6
  6. 6Current fibre density= 7.50 g per 1000 kcal

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 2 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 link fibre to energy intake?

Fibre comes with food volume, so larger eaters need proportionally more to achieve the same dietary quality.

How quickly should intake rise?

Gradually over a few weeks with extra fluid, since a sudden increase commonly causes bloating.

Related Calculators

Fibre Requirement Calculator – Calculate Daily fibre target