Bone Age Calculator
Estimate a child's adult height from their bone age and current height.
Awaiting Data
Enter your details and tap Calculate to see your results appear here.
Your result appears here.
What it measures
Bone age shows how far a child's skeleton has matured, read by a doctor from a hand X ray. Compared with calendar age, it hints at growth ahead. From bone age and current height, the Bayley and Pinneau method estimates adult height.
This tool needs a bone age that a radiologist has already measured. It cannot read an X ray for you. For calendar age, see our Chronological Age Calculator.
How to use this calculator
- Get the bone age from a doctor's X ray report.
- Choose metric or US units.
- Enter sex, current height, and bone age.
- Tap Calculate for the predicted adult height.
The formula used
- bone age
- Skeletal maturity from an X ray.
- percent
- Share of adult height reached, by Bayley and Pinneau.
Understanding Your Results
Tips to Improve
- Use a bone age read by a professional.
- Pair the estimate with growth charts.
- Re measure as the child grows.
- Discuss any concern with a pediatrician.
Bone age against calendar age
Two ages tell a growth story. Calendar age counts birthdays, while bone age reads skeletal maturity from a hand X ray. When bone age runs ahead, growth may finish sooner; when it lags, more height may lie ahead. The gap, not either number alone, holds the meaning.
This estimate uses the Bayley and Pinneau method, a long trusted way to predict adult height from bone age and current height. Read it as a guide beside growth charts, not a promise. For calendar age to the day, see our Chronological Age Calculator.
Where the limits lie
Genetics, nutrition, and health all shape final height, so no formula can be exact. A bone age must come from a doctor's X ray, since no tool can read film from a number alone. Discuss any worry about growth with a pediatrician. For developmental milestones, the Centers for Disease Control and Prevention is a calm guide.
Frequently Asked Questions
No. A radiologist provides the bone age; this tool uses that number.
It is a guide. Genetics, health, and timing all shape final height.
The Bayley and Pinneau average tables for predicted adult height.
Scientific References
- Bayley, N., & Pinneau, S. R. (1952). Tables for predicting adult height. Journal of Pediatrics, 40(4), 423–441.
- Greulich, W. W., & Pyle, S. I. (1959). Radiographic Atlas of Skeletal Development.