Child Adult Height Predictor
Fill in the values and the answer updates as you type.
How the Child Adult Height Predictor works
The mid-parental method adds the parents heights and then adjusts for sex. For a boy, adult height ≈ (father + mother + 13 cm) ÷ 2. For a girl, ≈ (father + mother − 13 cm) ÷ 2. About 95 percent of children land within 8.5 cm of the estimate. Nutrition, health, and puberty timing all play a part, so this is only a rough guide. Example: with Child sex Boy, Father height 178 cm, and Mother height 165 cm, the result is Predicted adult height (cm) = 178; Predicted adult height (ft and in) = 5 ft 10.1 in; Likely range, low (cm) = 169.5.
Inputs and results
The Child Adult Height Predictor takes 3 inputs and gives 4 results.
What you enter
- Child sex — starts at Boy. Choose from: Boy and Girl.
- Father height (cm) — starts at 178.
- Mother height (cm) — starts at 165.
What you get
- Predicted adult height (cm)
- Predicted adult height (ft and in)
- Likely range, low (cm)
- Likely range, high (cm)
Example: Child Adult Height Predictor with the starting values
With child sex Boy, father height 178 cm and mother height 165 cm, the calculator returns:
| Predicted adult height (cm) | 178 |
|---|---|
| Predicted adult height (ft and in) | 5 ft 10.1 in |
| Likely range, low (cm) | 169.5 |
| Likely range, high (cm) | 186.5 |
Change any value above and the results update straight away.
Child Adult Height Predictor FAQ
How do I use the Child Adult Height Predictor?
Enter child sex, father height and mother height in the fields, then read predicted adult height (cm), predicted adult height (ft and in), likely range, low (cm) and likely range, high (cm) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Child Adult Height Predictor calculate?
Expected adult height from the parents heights (mid-parental method). It returns predicted adult height (cm), predicted adult height (ft and in), likely range, low (cm) and likely range, high (cm) from the 3 values you provide.
What values does the Child Adult Height Predictor start with?
It opens with child sex Boy, father height 178 cm and mother height 165 cm so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Child Adult Height Predictor free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Child Adult Height Predictor for medical or health decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm medical or health decisions with a qualified professional. See the Disclaimer for more.