Baby Growth Percentile
Where your baby's weight and height fall among Korean peers, with age in months and corrected age.
Using the LMS growth reference published by Korea's National Health Insurance Service, this tool counts roughly where today's weight, height and head circumference fall among 100 babies of the same sex and month. Enter the birth date to get the age in completed months, and the due date to get a preterm baby's corrected age as well. Everything is computed inside this browser and stored nowhere.
Growth percentile
Enter sex, birth date, the measuring date and a weight, height or head circumference to get that month's percentile and z score. From 24 months, body mass index is counted too.
Open the percentile calculatorAge in months
From the birth date: completed months, days since birth, the 100th day and the first birthday. Add the due date to get the corrected age.
Open the months calculatorReference tables and sources
Which public datasets are used and under what terms, how the percentile is computed, and month-by-month percentile tables for boys and girls.
See the reference tablesHow to use
What a percentile is and is not, how months are counted, what differs for preterm babies, and where this app stops.
How to useWhat this app does not do
It does not label the numbers. Whatever the percentile, no verdict is attached beneath it, no growth is predicted, and no visit is replaced. This screen is not reference material for a paediatric check-up. A baby's growth is read as a trend over time rather than a single number, and reading that trend is the job of the doctor who examines the child.
What you type stays on this device
Neither the birth date nor the weight reaches our server, stays in this browser, or appears in the address bar. Close the page and it is gone. There is no account and no share feature.