Enter the child’s current height and the % of adult height attained (typically looked up from the Bayley–Pinneau tables using clinician-determined bone age, sex, and maturation tempo) into the calculator to estimate predicted adult height.

Bone Age Height Calculator (Bayley–Pinneau)

Enter current height and % of adult height attained to calculate predicted adult height

Tip: PM (% of adult height attained) is typically taken from Bayley–Pinneau tables using bone age, sex, and maturation category (late/average/early).

Related Calculators

Bone Age Height Formula

The following formula is used to estimate predicted adult height (PAH) using the Bayley–Pinneau approach once you have the child’s current height and the % of adult height attained from the BP tables.

PAH = C ÷ (PM / 100)

Variables:

  • PAH is the predicted adult height
  • C is the current height
  • PM is the percent of adult height attained (from Bayley–Pinneau tables)

What is a Bone Age Height?

In clinical practice, bone age is an estimate of skeletal maturity determined from an X-ray of the hand and wrist by comparing bone development to reference standards (such as the Greulich–Pyle atlas or Tanner–Whitehouse methods). A bone age–based height estimate commonly refers to a predicted adult height derived by combining the child’s current height with a bone-age-specific percentage from the Bayley–Pinneau tables. Clinicians use this as an estimate (not a guarantee) when evaluating growth patterns.

How to Calculate Bone Age Height?

The following steps outline how to estimate predicted adult height using bone age (Bayley–Pinneau):

  1. Have the child’s bone age assessed from a clinician-ordered hand/wrist X-ray and interpreted by a qualified professional (e.g., radiology/pediatric endocrinology).
  2. Using bone age, sex, and maturation tempo (late/average/early), look up PM = % of adult height attained in the Bayley–Pinneau tables.
  3. Measure the child’s current height (C) in any unit (cm, m, in, or ft).
  4. Compute predicted adult height: PAH = C ÷ (PM/100) (equivalently, PAH = C × 100 ÷ PM).
  5. Report the result in the desired unit (and remember this is an estimate that depends on the appropriateness of the table/category used).

Example Problem:

Use the following variables as an example problem:

Current Height (C) = 140 cm

% of Adult Height Attained (PM) = 88

Predicted Adult Height (PAH) = 140 ÷ (88/100) = 140 × 100 ÷ 88 = 159.09 cm (≈ 159.1 cm)