download.fan

Height Calculator

Predict how tall a child will be as an adult from the parents' heights (mid-parental method) or their height at age 2. In cm and feet and inches. Free.

Predicted adult height
178 cm (5 ft 10 in)
Likely range
170–187 cm
In feet and inches
5 ft 7 in to 6 ft 1 in

About 95% of children end up within 8.5 cm of their mid-parental height.

How tall will my child be?

The mid-parental method is the most common way to predict a child's adult height. Average the parents' heights, then add 6.5 cm for a boy or subtract 6.5 cm for a girl. With a 178 cm father and 165 cm mother, a son is predicted at 178 cm (5 ft 10 in) and a daughter at 165 cm. About 95% of children end up within 8.5 cm of this. A rougher rule doubles a boy's height at age 2, or a girl's at 18 months. Nutrition, health and puberty timing all affect the final height.

How to use it

  1. 1

    Choose a method

    Parents' heights, or the child's height at age 2.

  2. 2

    Enter the heights

    In cm or inches.

  3. 3

    See the prediction

    Predicted adult height and the likely range.

Frequently asked questions

How accurate is the mid-parental height?

About 95% of children end up within ±8.5 cm of it.

Does the doubling rule work?

It's a rough guide. Twice a boy's height at 2 (a girl's at 18 months) is usually within a few centimeters.

When do children stop growing?

Girls usually by 14–16 and boys by 16–18, a couple of years after puberty starts.

Is this medical advice?

No. If you're worried about a child's growth, talk to a pediatrician.

Health & fitness calculators

Related tools