Child Weight Percentile Calculator

A weight percentile tells you how your child's weight compares to other children of the same age and sex. For example, a child at the 60th percentile weighs more than 60% of children their age. Percentiles range from below the 5th to above the 95th, and most healthy children fall somewhere in between.

According to the CDC, a BMI-for-age between the 5th and 85th percentile is considered healthy weight. Below the 5th percentile is classified as underweight, between 85th and 95th is overweight, and at or above the 95th percentile is considered obese. A healthcare provider should interpret these results in context.

BMI is a screening tool, not a direct measure of body fat. It uses weight and height to estimate whether a child may have too much or too little body fat. Very athletic children may have a high BMI due to muscle mass rather than excess fat. Always consult a pediatrician for a full health assessment.

Not necessarily. A high percentile simply means your child is heavier than most children their age. It is one data point, not a diagnosis. Factors like bone structure, muscle mass, and growth patterns all matter. A pediatrician can evaluate the full picture and determine if any action is needed.

Most pediatricians track growth at every well-child visit — typically once a year for school-age children and more frequently for infants and toddlers. What matters most is consistent growth over time along a stable percentile curve, not a single measurement.

This calculator covers children and teens aged 2 through 19 years, consistent with CDC growth reference charts. For infants under 2, the WHO growth charts are more appropriate and a different calculator should be used.

Small differences can occur due to rounding of age, weight, or height values, and differences in the reference dataset or interpolation method used. This calculator is for informational purposes only — always rely on measurements taken by your child's healthcare provider for medical decisions.

A single out-of-range result is not cause for immediate alarm, but it is worth discussing with your child's pediatrician. Consistently low or high percentiles, or a rapid change in percentile over time, may warrant further evaluation for nutritional, hormonal, or other health concerns.