About This Site
Last updated: 2026-06-25
Baby Calculators is a website that offers free baby formula, feeding interval, infant growth percentile, and vaccine schedule calculators that new parents need most.
All calculations are based on trusted standards (WHO Child Growth Standards, standard immunization schedule, and more), run instantly in your browser, and never send or store your inputs on a server.
What is Baby Calculators?
Baby Calculators is a collection of free tools for the calculations parents run into often while raising a baby but find tedious to look up each time. You can find the daily formula amount from weight, check the feeding interval for the age, gauge how your baby's height and weight compare with peers as a percentile, and see the vaccine schedule from a birth date — all right in your browser with no install or sign-up.
Accuracy and reliability principles (E-E-A-T)
Accuracy matters above all for parenting and health information. Baby Calculators follows these principles.
- Trusted standards: growth percentiles use the LMS statistics from the WHO Child Growth Standards, and the vaccine schedule follows a standard immunization schedule.
- Standard formulas: formula amount uses about 150 ml per kg of body weight (range 120-180 ml), and percentiles use the LMS-to-z conversion.
- Adjustable values separated: recommended values that can change over time are kept as editable constants in the code so they are easy to keep current.
- Verified calculation logic: all calculation functions are pure functions that always return the same result for the same input, and they are pre-tested with a range of inputs.
- Transparent limits: each calculation is clearly marked as an estimate, and we recommend consulting a pediatrician so results are not taken as absolute.
Calculation sources
The standards and formulas used by Baby Calculators are based on authoritative references such as the following.
| Calculator | Basis / formula | Reference |
|---|---|---|
| Formula | about 150 ml per kg per day (range 120-180 ml), cap about 960 ml | American Academy of Pediatrics (AAP) general guidance |
| Feeding interval | recommended interval and frequency by month | general infant feeding guidance |
| Growth percentile | WHO growth standards LMS-to-z conversion | WHO Child Growth Standards |
| Vaccine | standard immunization schedule | CDC Immunization Schedules |
Official child health and immunization information is also available from authorities such as the CDC and the World Health Organization.
Medical disclaimer
All results from Baby Calculators are general medical reference information and estimates. No calculation result replaces medical diagnosis, prescription, or professional consultation. Decisions about your baby's health — formula amount, feeding, growth, vaccines, and more — must be made in consultation with a pediatrician or public health center. In an emergency, seek medical care immediately.
Operation and contact
- Operated by: Baby Calculators
- Contact email: jin@zerolabskorea.com
- Privacy: see the Privacy Policy for how data is handled.
The email and domain above are placeholder values. The site operator should replace them with real contact details.
Last updated: 2026-06-25