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How Much Milk Calculator

Put in your baby's weight and age and this gives the daily formula amount as a range, worked out two different ways from what the American Academy of Pediatrics actually publishes. If you are breastfeeding it will not give you a number, and the page explains exactly why that is the honest answer rather than a missing feature.

No account, no email, and nothing you type is sent anywhere.

What is she drinking? Breast milk has no arithmetic on this page and never will. Pick it and the page explains what to watch instead.
Formula in 24 hours
18–32 oz (540–960 ml)
An estimate with a wide range around it, worked two published ways at once. Babies regulate their own intake from day to day — the American Academy of Pediatrics’ own line is that no book or website can tell you precisely how much or how often your baby needs to be fed.
Drawn against the daily ceiling
Ceiling · 32 oz
The band both routes fall inside What the weight rule alone gives
By weight
27.6 oz
About 2½ ounces a day for every pound — a rule of thumb, capped at the daily ceiling.
By age, per feed
3–4 oz × 6–8
1 to 5 months: 18 to 32 ounces a day once the ceiling is applied.

The two published routes agree at this weight and age: the weight rule lands inside the range the per-feed figures give, which is the ordinary case. Use the band rather than either number, and let her leave what she does not want.

The published figure here is at least 3 or 4 ounces per feed about every 3 to 4 hours — at least, so the low end is a floor rather than a target. Nothing is published between the end of the first month and six months, so the top of this band is the 32-ounce daily ceiling rather than an invented per-feed number.

What this is. Arithmetic on two figures the American Academy of Pediatrics publishes, printed as a range because that is the shape they come in. It is an estimate about an average baby and it cannot see yours. The AAP itself notes there are high and low limits, and that a baby who consistently seems to want noticeably more or less than this is worth mentioning to your pediatrician — that sentence matters more than the band above it.

What it refuses to do. It will not turn breastfeeding into millilitres, because the calculation does not exist and every version of it on the internet is formula arithmetic wearing a different label. It will not tell you to top a baby up to fix sleep — no publisher this site may cite makes that claim, and the same body advises against adding cereal to a bottle for the same reason. It prints no single exact figure where the source gives a range, and there is no AI in it.

Two things that sit outside this page. Feeding equipment has to be sterilised, and made-up formula has to be prepared and stored the way the NHS sets out; neither is arithmetic and neither is covered here. And safe sleep still comes first between the feeds: babies sleep on their back, on a firm flat surface, in a cot clear of blankets, pillows, bumpers and soft toys, in your room for at least the first six months, with nothing weighted on or over them and never left alone with a propped bottle. If you are worried about feeding, weight or nappies, that is a call to your pediatrician or health visitor — and none of this is medical advice.

How this is worked out

  1. You give it three things: whether the milk is formula, breast or both, your baby's weight in kilograms or pounds, and her age in months. Everything is worked out in this browser and nothing you type is sent anywhere.
  2. The first route is by weight. The American Academy of Pediatrics publishes a rule of thumb: on average about 2½ ounces, which is about 75 millilitres, of formula a day for every pound of body weight — and no more than an average of about 32 ounces, or 960 millilitres, in 24 hours. This page applies that and shows the ceiling as a hard line on the drawing.
  3. The second route is by age, from the per-feed amounts the same organisation publishes: no more than about 1 to 2 ounces per feed in the first week; 3 to 4 ounces every 3 to 4 hours by the end of the first month; 6 to 8 ounces at each of 4 or 5 feeds by six months. Multiply the per-feed range by the number of feeds and you get a daily range straight out of the source, with the 32-ounce ceiling applied on top.
  4. The band you see holds both answers. When the weight figure lands inside the age range, the band is the age range with the weight figure marked inside it. When the two routes disagree — which happens at the edges, for a small baby who is feeding often or a big one who is not — the band stretches to cover both and the page says plainly that the two published routes have parted company at your numbers, which is worth mentioning to your pediatrician rather than resolving with a formula.
  5. For breastfeeding there is no arithmetic and there will not be. You cannot measure a breast, supply moves with demand, and the American Academy of Pediatrics' own answer to how much a breastfed baby needs is to feed whenever she seems hungry. What the page gives you instead is the checkable signal: nappies and weight gain, with the thresholds the NHS and the AAP publish and the point at which they say to make a phone call.
Questions

The short answers

For a formula-fed baby the American Academy of Pediatrics gives two answers and this page runs both: about 2½ ounces — around 75 millilitres — a day for every pound of body weight, and separately a set of per-feed amounts by age. Both stop at the same ceiling: usually no more than about 32 ounces, or 960 millilitres, in 24 hours. For a breastfed baby there is no volume answer, and the same organisation says so: feed whenever she seems hungry. Either way, the AAP's own line is the one worth keeping — no book or website can tell you precisely how much or how often your baby needs to be fed.
Take her weight in pounds and multiply by about 2½ to get ounces a day, or take her weight in kilograms and multiply by about 165 to get millilitres — that is the same rule of thumb converted, and this page does the conversion for you. Then cap the answer at around 32 ounces or 960 millilitres, because the guidance does. Treat the result as a middle rather than a target: the AAP notes there are high and low limits and that a baby who consistently wants noticeably more or less than this is worth a word with your pediatrician.
Because the calculation does not exist. A breastfed baby regulates her own intake and a nursing parent's supply moves with her demand, so there is no fixed number of millilitres to hit and no way to measure what went in. Every site that prints one has taken formula arithmetic and quietly relabelled it. What is genuinely useful is the other end: wet and dirty nappies, and weight gain. If you are expressing and want to know roughly what to put in a bottle, the AAP's published figure is that most breastfed infants take about an ounce in the first few weeks, rising to roughly four and a half ounces by a year — a range across a whole year, not a per-feed target.
It changes shape rather than falling off a cliff. Solids start to be added at around six months, and for the rest of the first year milk stays the main event while food is practice — this page therefore keeps showing the same six-to-eight-ounce feeds at four or five a day right through, and lets your baby do the adjusting. If she starts leaving milk in the bottle after a big lunch, that is information rather than a problem to correct.
By what comes out and by the scales, not by the bottle. The NHS looks for around six wet nappies a day from a few days after birth, with clear or pale yellow urine, and at least one poo a day in the early weeks. The AAP says a newborn may pee as often as every one to three hours or as rarely as four to six times a day, and that at least four wet nappies a day is generally reassuring. Steady weight gain at the routine weigh-ins is the other half. If nappies drop off, weight gain stalls, or your baby is hard to rouse for feeds, that is a call to your pediatrician or health visitor — this page cannot tell you anything about your own baby and nothing on it is medical advice.
In your own browser, under one key, so you do not retype it every week. Nothing is sent to a server, there is no account and no request carries it anywhere — the arithmetic runs on your phone. The Clear button under the calculator deletes it and a private window never keeps it at all.

Where this comes from

  1. American Academy of Pediatrics (HealthyChildren.org) (2022). Amount and Schedule of Baby Formula Feedings. https://www.healthychildren.org/English/ages-stages/baby/formula-feeding/Pages/Amount-and-Schedule-of-Formula-Feedings.aspx
  2. American Academy of Pediatrics (HealthyChildren.org) (2024). How Often and How Much Should Your Baby Eat?. https://www.healthychildren.org/English/ages-stages/baby/feeding-nutrition/Pages/How-Often-and-How-Much-Should-Your-Baby-Eat.aspx
  3. NHS (2024). Bottle feeding advice. https://www.nhs.uk/baby/breastfeeding-and-bottle-feeding/bottle-feeding/advice/
  4. NHS (2023). Formula milk: common questions. https://www.nhs.uk/baby/breastfeeding-and-bottle-feeding/bottle-feeding/formula-milk-questions/
  5. American Academy of Pediatrics (HealthyChildren.org) (2024). Baby's First Days: Bowel Movements and Urination. https://www.healthychildren.org/English/ages-stages/baby/Pages/babys-first-days-bowel-movements-and-urination.aspx
  6. American Academy of Pediatrics (HealthyChildren.org) (2022). How to Keep Your Sleeping Baby Safe: AAP Policy Explained. https://www.healthychildren.org/English/ages-stages/baby/sleep/Pages/A-Parents-Guide-to-Safe-Sleep.aspx
  7. NHS (2025). Reduce the risk of sudden infant death syndrome (SIDS). https://www.nhs.uk/baby/caring-for-a-newborn/reduce-the-risk-of-sudden-infant-death-syndrome/

Every link above was opened and read when this page was last updated. Snuggle is not affiliated with any of these organisations and none of them has reviewed this page. Nothing here is medical advice.

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The app this site is for

Snuggle does this with your baby’s own pattern.

This page works from an age band, because an age band is all a web page knows about you. Snuggle starts from the same bands and then blends them with what your baby actually did today — how long she lasted, when she went down, how the last nap ran — and shows on the face of the ring how sure it is. Early estimates say they are early.

It logs sleep, feeds, nappies and growth in one tap on a dim red screen, and every caregiver in the household is on the same timeline in their own account. The arithmetic runs on the phone, on your baby’s own history. There are no AI features in it.

In development for iPhone and Android. Not released yet — when it is, it will be on this site.

What Snuggle is