Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Head Circumference Percentile Calculator

Plots a child's head circumference against age-based growth norms to return a percentile. Used by pediatricians to screen for microcephaly, macrocephaly, and hydrocephalus.

Head Circumference (cm)

Age (months)

Fill in the required fields to see your result.

Pediatrics

Infant Development Milestone Calculator

Generates a composite developmental score for infants by assessing motor, cognitive, and social skill levels relative to age, with a correction for premature birth. Parents and clinicians use it to spot domains where a baby may need extra support.

Infant's Age (months)

Motor Skills Level

Cognitive Skills Level

Social Skills Level

Premature Birth Adjustment (weeks early)

Fill in the required fields to see your result.

Key differences

	Head Circumference Percentile Calculator	Infant Development Milestone Calculator
Category	Pediatrics	Pediatrics
Inputs required	2	5
Result	Percentile (%)	Development Score (months)
What it does	Plots a child's head circumference against age-based growth norms to return a percentile. Used by pediatricians to screen for microcephaly, macrocephaly, and hydrocephalus.	Generates a composite developmental score for infants by assessing motor, cognitive, and social skill levels relative to age, with a correction for premature birth. Parents and clinicians use it to spot domains where a baby may need extra support.