Free height calculator
How tall will I be?
Enter your mum’s and dad’s heights, and whether you’re a boy or a girl. You’ll see the range you’re likely to finish in.
Work out your range
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 it works
Free uses the Tanner method, a proven height formula. It needs three things: your mum’s height, your dad’s height, and whether you’re a boy or a girl.
Add your mum’s and dad’s heights and halve the total. That’s the middle of your parents’ heights.
Boys usually end up about 6.5 cm taller than that, girls about 6.5 cm shorter. That’s about 2½ in. It’s because boys and girls grow differently.
Most people finish within 8.5 cm of their middle, or about 3½ in. So your range runs 8.5 cm either side of it.
Say your mum is 165 cm and your dad is 181 cm. Half their total is 173 cm. A girl’s middle is about 167 cm, and her range is 158 to 175 cm. In feet and inches, that’s 5 ft 2 in to 5 ft 9 in.
It doesn’t use your age, your height today or your weight. That’s why 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
Will I end up inside my range?
Most people do, and a few finish outside it. It’s a guide, not a promise.
Can anything make me taller than my range?
No habit adds height beyond what your genes allow. Food, sleep and exercise help you grow normally.
What if I’m worried about my growth?
Talk to a doctor. This calculator can’t spot a growth problem, and it isn’t medical advice.