Compares an entered value with reference averages for ages 1-18.
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Calculation basis and official references
Reviewed on:
This calculator is not a diagnosis, treatment plan, or prescription. Please consult a qualified clinician about your medical decisions.
Formula basis
Uses age (1-18) and sex as keys into a reference table, then computes the difference between the entered height/weight and the looked-up reference values.
Calculation method
Looks up the national reference average height and weight for the given age and sex from the latest government survey figures and compares them with the entered values.
Exclusions and checks required
Ages 1-4 come from the decennial Infant and Preschooler Physical Growth Survey while ages 5-17 come from the annual School Health Statistics Survey, so the underlying survey year and method differ by age.
Age 18 is outside both the School Health Statistics Survey (ages 5-17) and the infant growth survey, so no current official figure backs that row.
This is not a growth-curve or month-level clinical assessment.
Example input:：Example: 6-year-old boy, height 115cm, weight 20kg
sex
Male
age
6
height
115
weight
20
The difference from the reference average (116.9cm/21.6kg) is a statistical comparison only, not an assessment of the child's development.
令和５（2023）年乳幼児身体発育調査 調査結果の概要Children and Families Agency (formerly conducted under the Ministry of Health, Labour and Welfare; the Agency has been responsible since the FY2023 survey)
Who is this calculator for? Child's Average Height and Weight
Compares an entered value with reference averages for ages 1-18.
What values should I enter?
Applies to: Population averages
How should I interpret this estimate?
Looks up the national reference average height and weight for the given age and sex from the latest government survey figures and compares them with the entered values.
How to use
Enter your input values and press Calculate.
Review the result and compare it with expected context.
Uses age (1-18) and sex as keys into a reference table, then computes the difference between the entered height/weight and the looked-up reference values.