Bone Age Estimation Calculator

Bone age (skeletal age) is a measure of how mature a child’s bones are compared to their chronological age. It helps pediatricians assess growth potential and predict adult height.

How bone age works: Bone age is typically determined by X-ray of the left hand and wrist, compared to a standard atlas (Greulich-Pyle method). This calculator provides a simplified estimation based on height percentile.

Height-for-age percentile concept:

• If a child is taller than average for their age, their bone age may be advanced (bones maturing faster).
• If a child is shorter than average, their bone age may be delayed (more growth potential remaining).

Average heights by age (approximate midpoints):

Key concepts:

• Advanced bone age: Bones are maturing faster than normal. The child may stop growing earlier.
• Delayed bone age: Bones are maturing slower. The child may have more time to grow.
• A difference of up to 1 year between bone age and chronological age is generally considered normal.

Predicted adult height uses the Bayley-Pinneau method concept: current height divided by the percentage of adult height typically achieved at the child’s bone age.

Important: This is a simplified estimation tool. Actual bone age requires an X-ray evaluated by a trained physician. Always consult a pediatrician for growth concerns.