Baby Height & Length Percentile Calculator
Enter your baby's age, sex, and length or height to instantly see their percentile, plotted on an interactive WHO or CDC chart.
Infant Growth Percentile Calculator.
Enter your baby's measurements and location to see percentiles on the most appropriate growth chart for your region — with interactive curves, growth spurt indicators, and a printable report.
Weight-for-age
Height-for-age
What do these numbers mean?
Multi-child dashboard.
No saved measurements yet
Calculate your baby's percentiles above, then click "Save to Dashboard" to track growth over time.
Open calculatorAll data is stored only in your browser's localStorage. Nothing is sent to any server.
Length vs. height: what's the difference?
Growth charts distinguish between length (measured with the baby lying flat, used up to age 2) and height (measured standing, used from age 2 onward). This distinction matters because a standing measurement is typically slightly shorter than a lying measurement, roughly by 0.5–1cm, due to spinal compression under gravity — growth charts already account for this difference.
Reading your baby's height percentile
A percentile from 3rd to 97th is within the typical healthy range. Height percentile tends to be more stable over time than weight percentile, since height is less affected by short-term factors like recent feeding or illness — a sudden shift is more likely to prompt a closer look from your pediatrician.