Baby Formula Calculator

Estimate how much formula a baby needs per day and per feeding from weight and age, based on about 2.5 ounces per pound of body weight. Example: a 10 lb baby at 2 months needs about 25 oz a day, or roughly 4 oz across 6 feedings.

FreeNo sign-up

Units

Baby weight

Age in months (0 for newborn)

How to use the Baby Formula Calculator

Enter the values in the fields.
Press Calculate to see the result with the steps shown.

Formula and method

Daily formula (oz) = baby weight (lb) x 2.5, up to about 32 oz. Per feeding = daily amount / number of feedings.

Typical formula amounts by age

Age	Per feeding	Feedings per day	Per day
Newborn (first days)	0.5 to 1 oz	8 to 12	Increases daily
1 month	2 to 4 oz	6 to 8	16 to 28 oz
2 to 3 months	4 to 5 oz	5 to 7	24 to 30 oz
4 to 5 months	4 to 6 oz	5 to 6	24 to 32 oz
6 months+	6 to 8 oz	4 to 5	24 to 32 oz, plus solids

Signs your baby is getting enough

Six or more wet diapers a day, steady weight gain, alertness between feeds and settling after feeding.

Signs of too little or too much

Poor weight gain, fewer wet diapers, extreme fussiness or frequent large spit-up call for a pediatrician visit.

Safe formula prep

Wash hands, use safe water, measure with the scoop provided, discard leftovers after an hour and never dilute or concentrate formula. This calculator is for education and is not medical advice. Your own doctor, midwife or pediatrician should guide decisions about your care.

Frequently asked questions

How much formula should a newborn drink?

Start with about 1 to 2 oz per feeding and increase.

How much formula per day?

About 2.5 oz per pound of weight, up to 32 oz.

How often should a baby eat?

Every 3 to 4 hours, on demand.

When can I start solids?

Around 6 months, as advised by your pediatrician.

What if my baby wants more?

Offer a little more and check with the pediatrician.

Can I use this for breastfed babies?

No.

Sources

Related calculators

Browse all calculators

Effortless Math Team

5 minutes ago