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

Adolescent Sleep Requirements Calculator

Estimates the recommended nightly sleep duration for teenagers aged 12–18 based on age, activity level, stress, and screen time habits. Helps set a science-backed bedtime routine.

Age (years)

Activity Level

Stress Level

Evening Screen Time

Fill in the required fields to see your result.

Key differences

	Head Circumference Percentile Calculator	Adolescent Sleep Requirements Calculator
Category	Pediatrics	Pediatrics
Inputs required	2	4
Result	Percentile (%)	Recommended Sleep Duration (minutes)
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.	Estimates the recommended nightly sleep duration for teenagers aged 12–18 based on age, activity level, stress, and screen time habits. Helps set a science-backed bedtime routine.