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Lactose Intolerance Portion Calculator

Work out lactose intolerance portion instantly with clear inputs, formula shown and shareable results.

About Lactose Intolerance Portion Calculator

Compares planned lactose intake with a personal daily tolerance, which is typically about 12 grams in one sitting for adults with lactose malabsorption.

Formula

Lactose tolerance

Servings allowed = daily tolerance / lactose per serving; 250 mL of milk contains about 12 g of lactose

Worked example

With the default values below, Lactose Intolerance Portion Calculator returns Servings within tolerance of 1.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Daily lactose toleranceaccepts 0.5–40 g
12 g
Lactose per servingaccepts 0.01–30 g
12 g
Servings plannedaccepts 0–10
1

Results

Servings within tolerance
1.00
Lactose in the planned servings
12.00 g
Remaining tolerance
0.00 g
Verdict
Within the stated tolerance

Step by step

  1. 1Values used
  2. 2Lactose tolerance
  3. 3Servings within tolerance= 1.00
  4. 4Lactose in the planned servings= 12.00 g
  5. 5Remaining tolerance= 0.00 g
  6. 6Verdict= Within the stated tolerance

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

How much lactose do most people tolerate?

Around 12 g in a single sitting, and more when spread across the day or taken with other foods.

Which dairy foods are lowest?

Hard aged cheeses contain almost none, and yoghurt is better tolerated because its bacteria supply lactase.

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