Assessed bone age below chronological age
Chronological age: 12 years, 0 months. Assessed bone age: 10 years.
10 − 12 = −2 years.
Bone Age Calculator - Greulich & Pyle Method
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Compare a bone age already assessed by a clinician with chronological age in years and months. This tool calculates the age difference; it does not read X-rays, determine skeletal maturity or diagnose a condition.
Compare a clinician-provided bone age assessment with chronological age. Enter the bone age from an existing X-ray assessment; this calculator does not estimate bone age from chronological age alone or interpret an X-ray. It subtracts chronological age from the assessed bone age to show the difference in years.
More tools:Age Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter chronological age in years and months.
Step 2
Enter the assessed bone age from the clinical report in years, using a decimal for part of a year.
Step 3
Read the numerical age difference. A negative result means the assessed bone age is lower; a positive result means it is higher.
Worked Examples
Example calculations
See the inputs and their calculated results.
Assessed bone age above chronological age
Chronological age: 8 years, 6 months (8.5 years). Assessed bone age: 10 years.
10 − 8.5 = 1.5 years.
Frequently Asked Questions
Common questions
A little more context for your results.
Where does the assessed bone age come from?
It comes from a clinical imaging assessment. The Greulich and Pyle method compares a hand and wrist radiograph with reference images. Enter the reported assessment here; the calculator does not perform that assessment.
Does the numerical difference diagnose a condition?
No. The difference is arithmetic, without diagnostic thresholds. A clinician must interpret the imaging assessment and medical context.
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Important
This calculator compares two supplied ages for educational use. Clinical interpretation requires a qualified clinician.