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Breast Milk Requirement Calculator

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

About Breast Milk Requirement Calculator

Multiplies infant weight by the daily millilitres-per-kilogram requirement and divides across the day's feeds, with energy at 0.67 kcal per mL of breast milk.

Formula

Infant feed volume

Daily volume = weight (kg) x 150 mL/kg/day (typical term infant); per feed = daily volume / feeds; energy = volume x 0.67 kcal/mL

Worked example

With the default values below, Breast Milk Requirement Calculator returns Daily milk requirement of 600. Change any input above and every figure here is recalculated in your browser.

Inputs used

Infant weightaccepts 0.5–15 kg
4 kg
Daily requirementaccepts 60–220 mL/kg/day
150 mL/kg/day
Feeds per dayaccepts 4–14
8

Results

Daily milk requirement
600 mL
Volume per feed
75 mL
Energy provided
402 kcal

Step by step

  1. 1Values used
  2. 2Infant feed volume
  3. 3Daily milk requirement= 600 mL
  4. 4Volume per feed= 75 mL
  5. 5Energy provided= 402 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 or compounding frequency into account.
  • Figures are rounded for display to whole numbers, 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

Does every baby need 150 mL/kg?

It is a guide for term infants after the first week; preterm and catch-up growth requirements are higher.

Do breastfed babies need measuring?

No. Demand feeding with weight gain and output monitoring is the norm; volumes matter for expressed or formula feeding.

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