Neonatal Gestational Age Calculator

Estimate gestational age using a simplified Ballard physical maturity score.

Skin

Lanugo

Plantar Surface

Breast

Ear/Eye

Genitals

Tab to move between fields

Physical Maturity Score

Estimated Gestational Age

34 weeks

How to Use This Calculator

Assess the newborn's physical maturity across six criteria and score each from 1 (immature) to 5 (mature).
Skin: score 1 = sticky/transparent, 3 = smooth/pink/visible veins, 5 = leathery/cracked/no visible veins.
Lanugo: score 1 = abundant, 3 = thinning, 5 = mostly bald. Plantar surface: score 1 = no creases, 5 = creases over entire sole.
Score Breast, Ear/Eye recoil, and Genitals maturity similarly from 1–5 based on the bedside Ballard criteria.
Review the Total Physical Score and Estimated Gestational Age in weeks — compare to stated gestational age to guide care decisions.

What each input means

Skin: 1 = Sticky/transparent, 3 = Smooth/pink, 5 = Leathery/cracked.
Lanugo: 1 = Abundant, 3 = Thinning, 5 = Mostly bald.
Plantar Surface: 1 = No crease, 3 = Anterior transverse crease, 5 = Creases over entire sole.
Breast: 1 = Imperceptible, 3 = Raised areola/3-4mm bud, 5 = Full areola/5-10mm bud.
Ear/Eye: 1 = Flat/stays folded, 3 = Curved/soft recoil, 5 = Firm/instant recoil.
Genitals: 1 = Immature, 3 = Moderate maturity, 5 = Fully mature.

Identify Input Parameters
4 parameters
Skin = 3, Lanugo = 3, Plantar Surface = 3, Breast = 3 = 6 input(s) provided
Calculate Physical Maturity Score
Physical Maturity Score
12 = 12

Engine last updated July 26, 2026. Checked against 3 independently-derived tests — how we verify calculators.

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