Formula Feeding Calculator
Enter your baby's weight in kilograms and how many feeds a day you are doing. The calculator applies the standard 150 ml per kg per day rule and shows the typical amount per feed, the accepted range, and the ounce conversion for bottle markings.
Feeding guides on formula tins give broad bands by age. Weight-based maths is more accurate: a small 3-month-old and a big one have very different needs, and per-feed amounts follow the day's total, not the month on the box.
How to use
- Weigh your baby (or use the last clinic weight) and enter it in kilograms.
- Count the actual number of feeds in the last 24 hours, including night feeds.
- Read the typical ml per feed and the range — feed to hunger cues within it, not to the line on the bottle.
Frequently asked questions
How much formula should a baby drink per feed?
By the 150 ml/kg/day rule, a 5 kg baby over 7 feeds takes about 107 ml per feed. The accepted range is 120-200 ml/kg/day: the same baby might reasonably take 86-143 ml per feed depending on growth and spitting-up.
When do feed amounts stop rising?
Around 5-6 months most babies settle near 150-210 ml per feed and the daily total stops climbing as solids start. Do not keep scaling up with weight forever — the per-day total plateaus in the second half of year one.
Should I wake a baby for a scheduled feed?
In the first weeks, yes if advised for weight gain; after that, night feeds on demand beat the clock. The calculator sets the day's budget, not a timetable — cluster feeding before bedtime is normal and not a sign of underfeeding.
Is more than 200 ml per kg per day dangerous?
It can indicate overfeeding or simply a growth spurt — one heavy day is fine, a steady pattern above the range is worth a pediatrician check. Never dilute or concentrate formula to adjust amounts.