TallPlanHeight and growth guides
Plain answers to what teens and parents ask about growing: how tall, until when, and what’s in your hands while you grow. Each guide lists its sources. Or go straight to the height calculator.
The mid-parental height formula, step by step
How to estimate a child’s adult height from both parents’ heights, with the formula in cm and inches, worked examples, and how wide the range really is.
When do you stop growing?
When girls and boys usually stop getting taller, by age, how the growth spurt works, the signs growth is ending, and when to talk to a doctor.
How much sleep do growing teens need?
How many hours of sleep children and teens need by age, why growth hormone is tied to deep sleep, and how to work out a bedtime that fits a school morning.
Protein and calcium for teens: how much, and from what
Daily protein and calcium targets for 9- to 18-year-olds, worked out by weight and age, with everyday foods that cover them and a sample day that adds up.
See your own range.
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