How are they growing?
Enter your child's measurements and we'll show their percentile, project their adult height, and compare to their genetic potential.
Stylized curves based on WHO/CDC growth standards. Benjamin is the green dot, sitting on the 57th percentile.
If Benjamin stays on the 57th percentile curve, projected adult height:
range: 5'8" to 6'0"
Based on parents' heights:
range: 5'7" to 6'2"
Adult height projection from a child's growth curve is roughly 85% accurate at age 2 or older — meaning a projected 5'11" usually lands within an inch or two. Under 12 months, projections are much less reliable; we'll show a wider range.
We use the same WHO/CDC growth standards your pediatrician uses, plus the mid-parental height formula (boys: parents' average + 2.5"; girls: parents' average − 2.5"), with a 95% confidence interval of ±4 inches.
What we don't do: predict height from genetic tests, account for nutrition or illness, or claim a single number is the answer. Children grow on their own curve, and outliers are common. Sources: WHO Child Growth Standards (2006), CDC Growth Charts (2000), Tanner et al. (1970).
A typeset keepsake — your baby's name, the projected adult height, and the 95% range. Cream + sage matte paper.
Free, attribution-only. One iframe — your readers stay on your page, the calculator works exactly the same, and the math runs on willthey.baby so we keep it accurate.