Free height predictor
Height predictor
Predict adult height from both parents’ heights. Enter each height, pick boy or girl, and see the range.
Predict adult height
It runs in your browser. Nothing you type is sent or saved.
It’s a guide, not a promise. A few people finish outside their range.
How the prediction works
This is the Tanner method, from 1970. It needs each parent’s height and whether the child is a boy or a girl.
Add the two parents’ heights and halve the total. Boys usually end up about 6.5 cm taller than that, girls about 6.5 cm shorter. That’s about 2½ in.
Most people finish within 8.5 cm of their middle, or about 3½ in. So the prediction is a range, not one number.
Say the mother is 160 cm and the father is 178 cm. Half their total is 169 cm. A boy’s middle is about 176 cm, and his range is 167 to 184 cm. In feet and inches, that’s 5 ft 6 in to 6 ft 0 in.
It doesn’t use age, height today or weight, so the range is wide. See the full method.
Want a narrower range?
For a narrower range, Plus uses the Khamis–Roche method. It takes what you’ve already given and adds your age, your height today and your weight today.
Centile Plus is for ages 13 to 17½, in the Centile app.
Get the Centile app
Free to download for iPhone and Android. Centile is for ages 13 and over.
Questions
Why is it a range, not one number?
Nobody can work out an exact adult height. Most people finish within 8.5 cm of their middle, and a few finish outside it.
Is it the same as the Centile app?
Yes. The free range in the app uses the same method and the same numbers.
Can it spot a growth problem?
No. It’s a guide, not medical advice. If you’re worried about growth, talk to a doctor.