Enter your child's age and a measurement to see their percentile and Z-score, calculated entirely in your browser from official growth reference data — nothing is uploaded or stored. Pick a standard below: WHO's international reference, or Japan's official MHLW survey data.
World Health Organization Child Growth Standards (2006) — used as the reference in most countries worldwide.
Percentile and Z-score for length or standing height by age and sex.
Open calculator →Percentile and Z-score for head circumference by age and sex.
Open calculator →Body mass index percentile, computed from weight and length/height.
Open calculator →Source: WHO Child Growth Standards, official LMS reference tables.
Based on Japan's official growth survey by the Ministry of Health, Labour and Welfare (厚生労働省) — useful if your pediatrician in Japan references the Japanese percentile chart and you'd like to check it in English.
Percentile based on Japan's official 2023 national infant growth survey.
Open calculator →Percentile based on Japan's official 2023 national infant growth survey.
Open calculator →Percentile based on Japan's official survey — head circumference is only measured under age 3 as of the 2023 survey.
Open calculator →Source: 厚生労働省 乳幼児身体発育調査報告書 (Japan's official national infant growth survey).