Baby milk calculator
Enter your baby's weight to see roughly how much formula they may take over a whole day.
Enter your baby’s weight to see a rough daily amount.
Based on the 150–200ml per kilo per day rule of thumb that NHS trusts publish for babies from the end of the first week to around 6 months. It is a sense check for the whole day, not a target for any one feed. Always make formula exactly as the tin says and let your baby’s hunger and fullness cues lead. Speak to your health visitor if you’re worried about how much your baby is taking.
Milk over 24 hours by weight
The same rule worked out for common weights, from the end of the first week to around 6 months. Split it across however many feeds your baby takes.
| Weight | Over 24 hours | In fl oz |
|---|---|---|
| 3kg (6lb 10oz) | 450–600ml | 15–20 fl oz |
| 3.5kg (7lb 11oz) | 525–700ml | 18–24 fl oz |
| 4kg (8lb 13oz) | 600–800ml | 20–27 fl oz |
| 4.5kg (9lb 15oz) | 675–900ml | 23–30 fl oz |
| 5kg (11lb 0oz) | 750–1000ml | 25–34 fl oz |
| 5.5kg (12lb 2oz) | 825–1100ml | 28–37 fl oz |
| 6kg (13lb 4oz) | 900–1200ml | 30–41 fl oz |
| 6.5kg (14lb 5oz) | 975–1300ml | 33–44 fl oz |
| 7kg (15lb 7oz) | 1050–1400ml | 36–47 fl oz |
| 7.5kg (16lb 9oz) | 1125–1500ml | 38–51 fl oz |
| 8kg (17lb 10oz) | 1200–1600ml | 41–54 fl oz |
Common questions
How is this worked out?
It multiplies your baby's weight by 150–200ml, the per-kilo rule of thumb NHS trusts publish for formula-fed babies from the end of the first week to around 6 months, then divides the day's total by the number of feeds. Read the NHS guidance (Derbyshire Family Health Service).
Why is there no figure for the first week, or after 6 months?
The rule only covers the end of the first week to around 6 months. In the first few days newborns take small amounts, little and often. Once solids start, milk reduces gradually. A figure for either would be a guess.
Does it work for expressed breast milk?
The figure comes from NHS formula-feeding guidance. Expressed milk is given in broadly similar amounts, but breastfed babies' intake varies more, so treat the result as a rough guide and ask your midwife or health visitor about your own baby.
How do I know my baby is getting enough?
The reassuring signs are at least 6 heavy, wet nappies a day from day 5, steady growth along their own centile line, and a baby who seems content after most feeds. See the NHS signs of enough milk.
When should I get advice?
Speak to your midwife, health visitor or GP if your baby's intake drops suddenly and stays down, if they take far less than these amounts and have fewer wet nappies, or if they're hard to rouse for feeds. If you think your baby is seriously unwell, call 111, or 999 in an emergency. Never add extra scoops or dilute formula: make it exactly as the tin says.
My baby was born early. Does this apply?
Premature babies can have different needs, so follow the feeding plan from your neonatal team or health visitor rather than this calculator.
Related guides
CubTrack is a baby tracker, not a medical service. This calculator gives general information, and your midwife, health visitor or GP knows your baby and should guide feeding decisions.