Formula Feeding Calculator

Get a rough idea of how much formula a baby under about 6 months may need each day, based on weight, and how that splits across feeds. General guidance, not medical advice.

General guidance, not medical advice. Follow your pediatrician and the directions on your formula tin. Not for babies on solids or over 6 months without guidance.

Baby's weight

Feeds per day

Enter your baby's weight to see an estimate.

How to use this

Treat the numbers as a starting point and feed on cue. Always follow your formula tin's mixing instructions and your pediatrician's advice.

How it works

A common starting point for babies under about 6 months is roughly 150 ml of formula per kilogram of body weight per day. Enter your baby's weight in kilograms or pounds and we convert and apply that rule.

We then divide the daily total by the number of feeds you choose (8 by default) to show a per-feed amount in both millilitres and ounces. The daily total is capped at a sensible maximum so the estimate stays reasonable for heavier babies.

Every baby is different. Use this as a ballpark only, and always follow the directions on your formula tin and the advice of your pediatrician or health visitor — especially once your baby starts solids or is over 6 months.

Frequently asked questions

How much formula does my baby need? +

Under about 6 months, many babies take roughly 150 ml per kg of body weight per day, spread across feeds. This tool turns that rule into an estimate, but appetite varies day to day. Feed responsively and let your baby's hunger and fullness cues guide the amount.

Why is there a maximum daily amount? +

Beyond a certain point, more formula isn't usually needed and can be too much. We cap the daily estimate at about 1200 ml (around 32 oz). If your baby seems to want more than this, talk to your pediatrician rather than simply increasing the bottles.

Is this right for babies over 6 months or on solids? +

No. Once solid foods start, milk needs change and this simple weight rule no longer applies well. For older babies, babies on solids, or any feeding concern, follow your formula tin and your pediatrician's guidance.