This formula feeding calculator helps you find out how much formula should you feed your newborn or infant based on age and weight. You can read more on this subject below the tool.


How does this formula feeding calculator work?

This is a useful calculator for all mothers that are concerned whether their baby has enough formula and about which is the recommended amount they should be giving to their baby.

The formula feeding calculator is designed to answer this important and sometimes stressing question for new mothers by taking into account the age and weight of the baby.

There are different stages in the baby’s formula intake and this varies from newborns to infants and according to how much they weigh.

Formula feeding guidelines

Here are the guidelines to be followed according to age and taking into consideration the standard infant formula with 67 calories per 100 ml. These recommendations are also affected by whether the baby 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.

How much formula each feed?

Although the 24h quantity of formula depends largely on the baby’s weight. The amount that is given each feeding varies with age and according to the digestive capacity of the baby. Here are some recommendations:

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

Example calculation

Let’s take the case of a baby aged 3 months with a weight of 5 kg and 800 grams.

■ The quantity of formula your baby should have in a 24h period is between 870 ml and 1044 ml.

■ At this age, each feed should consist of around 150 to 220 ml.


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

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

29 Apr, 2015