Child Weight Percentile Calculator
Find your child's weight percentile using WHO growth standards for ages 0 to 5 years with z-score and growth band.
What Is a Child Weight Percentile?
A weight percentile compares a child's body weight to WHO reference children of the same age and sex. It helps pediatricians monitor growth velocity rather than judge a single number. Pair results with the Child Height Percentile Calculator and Baby Percentile Calculator for infants under 24 months.
Reading the WHO Weight Chart
Healthy children often track a similar percentile canal over months. A shift across two or more percentile bands may signal illness, feeding issues, or endocrine problems and should prompt clinical review.
Weight vs BMI Percentile
Weight alone does not account for height. After age 5, BMI percentile becomes more informative. For combined height and weight context under 5, use the Child BMI Percentile Calculator for ages 2 to 20.
Frequently Asked Questions
What ages are included?
This tool covers 0 to 60 months (5 years) using WHO weight-for-age reference medians and standard deviations by month.
What weight unit should I use?
Enter weight in kilograms. One pound is about 0.454 kg.
What does the 85th percentile mean?
About 85% of reference children at that age weigh less and about 15% weigh more. It is not automatically unhealthy.
Can I use decimal months for age?
Yes. Enter ages such as 5.5 months or switch to years for older toddlers.
How is the growth band shown?
The band groups percentiles into clinical ranges such as 50th to 75th, matching common WHO chart intervals.
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