Baby Growth Calculator

Calculate your baby's height, weight, and head circumference percentile online using WHO Growth Standards and the 2017 Korean pediatric growth chart. See your child's ranking compared to peers in under a minute.

Date of Birth

Gender

Measurement Date

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What is the Baby Growth Calculator?

A browser-based baby growth calculator for tracking infant and toddler development online. Enter your child's birth date, sex, height, weight, and head circumference to get percentile rankings compared to peers. Uses WHO Growth Standards for children under 36 months and the 2017 Korean Pediatric Growth Chart for ages 36 months and older. Calculations are based on exact age in days for greater precision.

Growth Standard Application

For children under 36 months the WHO Growth Standards are applied. These standards are based on an ideal growth model including breastfed infants and are the most widely used international reference.

For children 36 months and older the 2017 Korean Pediatric Growth Chart is used. This fully reflects the data used as the standard by Korea's CDC and pediatric clinics.

How to Interpret Percentile Results

Percentile shows where your child ranks among 100 children of the same age and sex.

Percentile Range	Interpretation	Action
Above 97%	Overgrowth or obesity concern	Further evaluation recommended
85–97%	Larger than peers	Periodic monitoring needed
15–85%	Normal range	Normal development
Below 3%	Growth delay concern	Specialist consultation needed

What matters more than a single number is the rate of growth. Even a low percentile is considered healthy if the child consistently grows along their own curve. If percentile shifts by two or more bands across two measurements, consult a pediatrician.

Recommended For

Before check-ups: When you want to check your child's growth percentile before a pediatric visit
Growth tracking: When monitoring your child's growth pattern over time
Preemie parents: When evaluating premature baby growth using corrected age
Peer comparison: When curious about how your child's height and weight compare to peers
Growth spurt check: When wondering if your child is in a rapid growth phase

Frequently Asked Questions

Very accurate. The calculator uses your child's exact age in days from their birth date before comparing with the growth chart, giving much more precise results than simple month-based comparisons.

Premature babies should use corrected age calculated from the expected due date rather than the actual birth date. Corrected age is typically applied until 24 months of age.

Not necessarily. Anything within the 3rd to 97th percentile is normal. What matters is whether the child is growing consistently along their own curve. Consult a pediatrician if there are sudden percentile shifts.

A period when your child eats much more, sleeps more, and grows rapidly. It typically occurs around 3 weeks, 6 weeks, 3 months, and 6 months of age. Temporary fussiness and increased feeding are normal.

Yes. Head circumference up to age 2 is an important indicator of brain development. If it is significantly smaller or larger than peers, additional testing may be needed. Always have it measured during regular check-ups.

Baby Growth Calculator

What is the Baby Growth Calculator?

Growth Standard Application

How to Interpret Percentile Results

Recommended For

Frequently Asked Questions

1.How accurate are the results?

2.How should premature babies be measured?

3.Is a low percentile a problem?

4.What is a growth spurt?

5.Is head circumference important?

Frequently Asked Questions

1.How accurate are the results?

2.How should premature babies be measured?

3.Is a low percentile a problem?

4.What is a growth spurt?

5.Is head circumference important?