Baby Formula Calculator: How Much Milk Your Baby Needs a Day and Per Feed

Calculate the volume

Give your baby's weight in kilos and the number of times you feed in a day. Also fill in the baby's age. This calculator works till the baby has reached 6 months, as post that period babies should move to a mix of semi-solid food and milk, the exact proportions and ratios which are best defined in consultation with a pediatrician.

How did this number come about?

The calculator uses approximately 150 ml of prepared formula per kilogram of body weight per day as a starting estimate. It divides this by the number of feeds you enter. The result is a guide; follow your baby's hunger and fullness cues.

The guideline for formula milk is generally accepted to be 960 ml. If the calculation exceeds that due to your baby's weight, please consult your pediatrician. It is important to remember that the above guidance is for babies past their first week and below six months of age who are formula fed.

This is for formula milk, not breast milk

Babies feeding directly at the breast are generally fed according to hunger and fullness cues rather than a measured volume. Milk supply responds to feeding. Wet nappies and appropriate weight gain help indicate whether your baby is getting enough milk. The feeding tracker can help you keep a record.

This calculator does not estimate breast-milk intake, including expressed breast milk, or formula top-ups for babies receiving both breast milk and formula. For mixed feeding, ask your pediatrician for individual advice.

Always prepare formula using the exact water-to-powder ratio on the container. Measure the water first, then add the stated number of level scoops. Adding extra water or powder can be harmful.

How this changes with age

During the first week, feeding amounts change rapidly. This calculator begins after that first week.

In the early months, babies generally progress from smaller, more frequent feeds to larger, less frequent feeds. The daily weight-based estimate remains a guide rather than a fixed requirement.

Around six months, babies begin complementary foods. As they gradually eat more food, their formula intake may decrease. This calculator ends below six months for this very reason.

Let your baby decide, not the bottle

Offer feeds when your baby shows hunger cues and stop when they show they are full. Turning away, closing the mouth or slowing down can signal that they have had enough. There is no need to finish every bottle.

Steady growth and regular wet nappies are more useful than hitting an exact daily number. If your baby remains hungry despite feeds or you are unsure about the amount, speak with your pediatrician.

When to speak with your doctor

Premature babies and babies with low weight, poor growth or medical conditions affecting feeding need individual feeding advice. Follow the amounts recommended by their pediatrician.

Speak with your pediatrician if your baby remains unusually hungry, seems very distressed during or after feeds, vomits forcefully or has fewer wet nappies than usual.

Regular growth checks help establish whether your baby is receiving enough nutrition. This calculator provides an approximate feeding estimate; it cannot assess your baby's growth or health.