KidGil | Baby formula calculator

How much formula
does your baby need

A free baby formula calculator based on age and weight, with support for corrected age in premature babies and for babies starting solids.

Start calculating FAQ
This tool provides a general range and does not replace advice from a pediatrician or a pediatric dietitian.
WHO-informed Preterm adjusted Feeding schedule included Free

Before you start: what the calculator shows

Enter age, weight and feeding stage, and the calculator will show an estimated daily formula range, amount per feed and a flexible feeding schedule.

Helpful range, not a strict target
What to enter Sex, age manually or by birth date, current weight in kg or grams, and if born preterm, gestational age at birth.
What you get A daily ml range, amount per feeding, number of feeds per day and safety notes based on the baby's situation.
How to read it The result is based on age and weight, but real feeding should also follow hunger cues, fullness cues and growth tracking.
Baby Formula Calculator by Weight and Age

Baby Formula Calculator by Weight and Age

Estimate daily formula intake and amount per feed by age, weight and feeding stage, with responsive feeding and growth tracking in mind.

AAP-informed
WHO-informed
Responsive feeding

Calculation details

Estimate a formula range by age and weight for healthy full-term babies, with cautious corrected-age adjustment for preterm babies.

1Sex
2Baby age
3Current weight
Weight unit
Weight kg
kg (0.5-20) - default: 5.5

Formula calculation results

Important note for preterm babies: For preterm babies, especially after a NICU stay or when using preterm/enriched formula, follow discharge instructions and professional guidance. The calculator does not replace an individual feeding plan.

Amount per feed
-
ml
Feeds
Feeds per day
-
feeds
Total
Daily total
-
ml/day
Note: According to AAP/HealthyChildren, healthy full-term babies generally do not need more than about 32 oz of formula per day, about 960 ml. This is a soft general ceiling, so if intake is consistently higher, consult a pediatrician or pediatric dietitian.

Suggested feeding schedule for the day

Day (06:00-21:59)
Night (22:00-05:59)

Suggested schedule only. Feed according to hunger and fullness cues and your home routine.

What to expect in about 2 months

Cues worth knowing

  • Full: slows down, releases the nipple, turns head away.
  • Hungry: opens mouth, roots or moves head, brings hands to mouth. Crying is a late cue.
  • Check further: frequent vomiting, discomfort or a persistent need for a very high amount.

Save the input and result to your account

You can return to the calculated range, save measurements and keep tracking over time.

Full transparency

What is this tool based on?

The calculator uses two main inputs: corrected age and current weight, aligned with practical feeding guidance from WHO and AAP/HealthyChildren resources.

  • 1
    ml/kg/dayFormula needs are estimated by body weight, because needs change with growth as well as age.
  • 2
    960 ml/day soft ceilingA general AAP/HealthyChildren reference for healthy full-term babies. Consistently needing more calls for professional review.
  • 3
    Corrected age for preterm babiesA baby born at 34 weeks and now 12 weeks old is calculated as roughly 4 weeks corrected age for formula estimation.
  • 4
    Adjusted for solidsAs solids become a bigger part of the diet, formula intake usually decreases. The tool adjusts by feeding stage.
  • 5
    WHO -2SD growth signalIf weight is lower than expected for age, the tool shows a professional-review alert.
Formula ranges by corrected age and feeding stage
Corrected ageml/kg/dayFeeds/day
First week30-60 ml/feed8-12
Weeks 1-4150-1658-10
1-2 months150-1656-8
2-4 months140-1655-6
4-6 months120-1504-5
6+ no solids120-1504-5
6+ first tastes100-1303-5
6+ partial solids70-1103-4

Scroll horizontally if the table is wider than the screen.

Professional sources and references
  1. AAP / HealthyChildren - Amount and Schedule of Baby Formula Feedings
  2. WHO - Infant and Young Child Feeding
  3. WHO 2023 - Guideline for Complementary Feeding of Infants and Young Children 6-23 Months of Age
  4. WHO - Preterm birth: before 37 completed weeks of gestation
  5. Israel Ministry of Health - Preterm birth before week 37
  6. Israel Ministry of Health - Infant formula up to one year, responsive bottle feeding and transition to complementary foods.
  7. Kleinman RE, Greer FR (eds). Pediatric Nutrition, 8th ed. American Academy of Pediatrics, 2019.
  8. Abrams SA; AAP Committee on Nutrition - Calcium and Vitamin D Requirements of Enterally Fed Preterm Infants.
Important to know

When should you contact a professional?

The tool gives a direction. Some situations need direct medical or nutrition guidance.

Contact your pediatrician or a pediatric dietitian if:
  • Your baby is not gaining weight according to growth charts.
  • Your baby consistently drinks far above the calculated range and still seems unsatisfied.
  • Your baby refuses formula completely or vomits a large part of feeds.
  • You suspect cow's milk intolerance, significant reflux or allergy.
  • Your baby was born preterm and recently came home from the NICU.
  • The amount is consistently above about 960 ml/day in a healthy full-term baby.
  • When in doubt, professional guidance is better than guessing.
Questions and answers

Common parent questions

Open a question to read the answer

  • How much formula does a 2-month-old baby need?
    At around 2 months and an average weight of about 5 kg, the typical range is about 750-825 ml per day, divided into 6-8 feeds. The exact amount depends on the baby's actual weight.
  • Does formula amount increase with age?
    Not always. Intake rises as the baby gains weight, but from around 6 months, once solids begin, formula intake often gradually decreases.
  • What does corrected age mean for a preterm baby?
    A baby born at 34 weeks who is now 12 weeks old chronologically is treated as roughly 4 weeks corrected age for feeding calculations. This affects daily range, feed size and number of feeds.
  • What happens to formula intake when solids begin?
    As solids take up more room in the diet, formula intake usually decreases. With first tastes the decrease is small; with partial solids, the daily amount may fall more noticeably.
  • Is there a maximum amount of formula per day?
    It is not an absolute ceiling. AAP/HealthyChildren notes that healthy full-term babies generally do not need more than about 32 oz per day, about 960 ml. If your baby consistently needs more, seek professional guidance.
  • Why is my baby drinking less than the calculator suggests?
    There can be many reasons, including tiredness, gas, a growth-spurt pattern or a longer sleep stretch. If it continues for more than 2-3 days with poor weight gain, unusual irritability or dark urine, contact a pediatrician.
  • We combine breast milk and formula. How should we calculate?
    The calculator estimates the formula portion only. For balancing breast milk and formula, it is best to work with a lactation consultant, pediatrician or pediatric dietitian.
  • My baby was born preterm. What should I enter?
    Select "Born before 37 weeks" and enter gestational age at birth. The calculator will use corrected age and show an adjusted range. Recently discharged preterm babies need close professional follow-up.
  • What if my baby wants more than the range?
    Check whether this may be hunger, a need to suck, a growth spurt or a temporary pattern. If intake is consistently above about 960 ml/day, or your baby remains unsettled after feeds, ask a pediatric professional.
  • How many times a day should I feed my baby?
    It depends on age: first week 8-12 feeds; 1-2 months 6-8 feeds; 2-4 months 5-6 feeds; from about 4 months 4-5 feeds. The calculator shows the relevant range with a suggested schedule.
More tools

What comes after formula?

Solids

Readiness for solids

When is your baby ready to start solids? Check readiness signs by age and motor development.

Open tool
Growth

Growth calculator

WHO-based growth charts, corrected age calculation and BMI for babies and children.

Open tool

Use the result as a range

Formula amounts vary between babies and days. Follow hunger and fullness cues, and use growth tracking to understand the bigger picture.

Back to calculator

General information only. Not a substitute for medical advice.