Baby Weight Percentile Calculator

Track your baby's weight against WHO growth charts. See their percentile ranking for age and sex.

Inputs

Baby's Age

months

Weight

Unit

Sex

Tab to move between fields

Results

Weight Percentile

33.1%

ClassificationNormal

Weight (kg)7.5 kg

Weight (lbs)16.5 lbs

Median for Age (kg)7.9 kg

How to Use This Calculator

Enter your baby's age in months (0–36).
Input your baby's current weight and select pounds or kilograms.
Select baby's sex (male or female) for the correct WHO growth chart.
Review the Weight Percentile result and growth category.
Bring these results to your pediatrician to discuss growth trends over time.

How the result changes with Weight

Weight	Weight Percentile
5.9	0.1%
18	61%
33	99.9%
45	99.9%

What each input means

Baby's Age: Age in months.
Weight: Body weight in the selected unit.
Unit: Measurement system to use.
Sex: Biological sex for calculation accuracy.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Baby's Age = 6, Weight = 16.5, Unit = 0, Sex = 0 = 4 input(s) provided
Calculate Weight Percentile
Weight Percentile
33.1 = 33.1
Calculate Classification
Classification
Normal = Normal
Calculate Weight
Weight
7.5 = 7.5

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