HeightPredictorChild height calculator · ages 2–12
How tall will your child be?
Your heights, their age and height today. You get their adult height and their percentile on the CDC growth chart. A height calculator for ages 2 to 12, built on the same references pediatricians use.
Calculate their heightA boy, 8, on the CDC chart
How it works
How tall will my son be? My daughter?
Same formula, one difference: for a son, add 2.5 inches (6.5 cm) to the mother's height before averaging; for a daughter, subtract 2.5 inches from the father's. Boys keep growing about two years longer, so a boy's growth percentile at 12 can still shift more than a girl's.
"How tall will my son be?" is the most common question we get from parents. "How tall will my daughter be?" is second. The honest answer to both is a range about 4 inches (10 cm) wide at age 8, narrowing to about 2 inches by 14.
A worked example: a boy of 8
Father 5'10", mother 5'5", son aged 8 and 4'3.5" (131 cm) today. Mid-parental target: (70 + 65 + 2.5) ÷ 2 = 68.75 in, just under 5'9". On the CDC growth chart, 4'3.5" at 8 sits at the 72nd percentile for boys: taller than about seven in ten boys his age.
A boy who keeps tracking the 72nd percentile ends up around 5'11", so the result reads above the parents' target, with a range of about ±2 inches. Had he been at the 40th percentile, the same parents would give a result nearer 5'9". That is why today's height and age go in, not just yours.
CDC growth chart: 5th, 50th and 95th percentile by age
The normal band on the chart, ages 2 to 12. A child between the 5th and 95th lines is growing normally; the line they follow is what matters, and the result reads it for you.
| Age | Boys 5th | Boys 50th | Boys 95th | Girls 5th | Girls 50th | Girls 95th |
|---|---|---|---|---|---|---|
| 2 | 2'8" · 81 cm | 2'10" · 86 cm | 3'0.5" · 92 cm | 2'7" · 79 cm | 2'9.5" · 85 cm | 2'11.5" · 91 cm |
| 5 | 3'4" · 101 cm | 3'7" · 109 cm | 3'9.5" · 116 cm | 3'3.5" · 100 cm | 3'6.5" · 107 cm | 3'9.5" · 115 cm |
| 8 | 3'10.5" · 118 cm | 4'2" · 128 cm | 4'6" · 137 cm | 3'10.5" · 118 cm | 4'2" · 127 cm | 4'6" · 137 cm |
| 10 | 4'2.5" · 128 cm | 4'6.5" · 138 cm | 4'11" · 149 cm | 4'2" · 127 cm | 4'6" · 138 cm | 4'10.5" · 149 cm |
| 12 | 4'6" · 137 cm | 4'10.5" · 149 cm | 5'3.5" · 161 cm | 4'6.5" · 139 cm | 4'11.5" · 151 cm | 5'4" · 163 cm |
Source: CDC 2000 growth charts, stature-for-age, ages 2 to 20 (LMS tables), rounded to 0.5 inch and 1 cm.
Ages 2 to 12 here. 13 or older? Take the predictor.
This page is a height calculator for kids, asked in your words about your child. From 13 the growth spurt makes the curve personal, so the teen should answer for themselves.
People also ask
What is the mid-parental height formula?
For a boy: (mother's height + 2.5 in + father's height) ÷ 2. For a girl: (father's height − 2.5 in + mother's height) ÷ 2. The result is the genetic target; most children land within about 4 inches (10 cm) of it. The height calculator formula here adds the child's own growth curve on top, which tightens the range.
How accurate is a child height calculator?
Mid-parental height alone is right to within about 4 inches for 95 percent of children. Adding the child's current height and age against the CDC growth chart roughly halves that. Illness, nutrition and timing of puberty explain most of what remains.
What does a height percentile mean?
The share of children of the same age and sex who are shorter. The 50th percentile is the median. Between the 5th and 95th is the normal range on the CDC growth chart; outside it, a pediatrician usually takes a closer look.
What is a bone age calculator, and do I need one?
A bone age reading comes from an X-ray of the hand and tells how mature the growth plates are. It is the most precise input for adult height, but it needs a clinic. This calculator uses age, height and parent heights instead, which is what the Khamis-Roche method does without an X-ray.
Is this the same as a growth percentile calculator?
It includes one. A growth percentile calculator gives you today's position on the chart; this result adds the projected adult height and how much of the remaining growth sleep, movement and food can still move.
When do boys and girls stop growing?
Girls usually stop between 15 and 16, boys between 17 and 18, when the growth plates close. Early or late puberty shifts those ages by a year or two either way.