Formula Feeding Calculator

Estimates recommended formula amount based on new-born or infant age and weight.

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Steps on how to print your input & results:

1. Fill in the calculator/tool with your values and/or your answer choices and press Calculate.

2. Then you can click on the Print button to open a PDF in a separate window with the inputs and results. You can further save the PDF or print it.

Please note that once you have closed the PDF you need to click on the Calculate button before you try opening it again, otherwise the input and/or results may not appear in the pdf.

About formula feeding

The formula feeding calculator determines recommended formula amount by taking into account the age and weight of the baby. It uses the guidance in the below table and considers the 67 calories per 100 mL of standard infant formula.

Please note that these recommendations could be affected if the infant has been diversified and also eats solids.

Age Formula
Preterm 180ml per kilogram per day.
5 days to 3 months 150ml per kilogram per day.
3 to 6 months 120ml per kilogram per day.
6 to 9 months 100ml per kilogram per day.
9 to 12 months 60-90ml per kilogram per day.

Source: National Health & Medical Research Infant Feeding Guidelines. 2013, page 79.

Whilst the 24h quantity of formula depends largely on the baby’s weight, there are also guidelines on the amount to be given with each feed, and these vary with baby’s age (according to digestive capacity):

Age Formula
up to 2 weeks around 70 ml
up to 1 month 75 - 105 ml
between 1 and 3 months 110 - 150 ml
between 3 and 4 months 150 - 220 ml
between 4 and 6 months 200 -210 ml
after 6 months 150-200 ml


Unicef UK. (2007) Health Profesional’s guide.

Stuebe A. (2009) The Risks of Not Breastfeeding for Mothers and Infants Rev Obstet Gynecol; 2(4): 222–231

Specialty: Neonatology

Objective: Determination

No. Of Variables: 2

Article By: Denise Nedea

Published On: April 11, 2020

Last Checked: April 11, 2020

Next Review: April 11, 2025