How to use
- Enter Baby's sex, Age, Current weight, Reference chart, WHO (World Health Organization) in Baby Weight Percentile Calculator. Use the freshest measurement you have, ideally from the same day or clinic visit.
Baby Weight Percentile Calculator
Calculate your baby's weight percentile using WHO or CDC growth charts. See if your baby is growing on track.
Growth Assessment Results
Your Baby · Growth Status
18.4 Percentile
Below average
Age: 6.0 months
Weight: 7.20 kg (7.2 kg)
Z-score: -0.90
Reference: WHO Child Growth Standards (WHO Child Growth Standards (2006)) · Supported ages: 0–60 months
Recommendation
Continue regular monitoring as part of routine care
About Percentiles
Percentiles show how your baby's weight compares to other babies of the same age and sex. For example, being in the 75th percentile means your baby weighs more than 75% of babies their age.
Parent guide
How to use this tool
Calculate your baby's weight percentile using WHO or CDC growth charts. See if your baby is growing on track.
What the result means
Calculate your baby's weight percentile using WHO or CDC growth charts. See if your baby is growing on track.
Method
LMS z-score using the selected WHO or CDC weight-for-age reference
Worked example
Important limitation
A single measurement cannot diagnose growth faltering; use repeated, accurately measured weights.
Primary sources
References and data notes
Safety note
Use this result for planning and discussion. Contact a qualified healthcare professional for unusual growth changes, feeding difficulty, fever, missed vaccines, developmental concerns, or urgent symptoms.
Next tools to compare
Baby Height Percentile CalculatorDetermine your baby's height percentile based on WHO or CDC growth charts. Track your baby's growth.Baby Head Circumference CalculatorTrack your baby's head growth percentile using reliable WHO/CDC charts. Monitor brain development.Baby BMI & Weight-for-Length CalculatorCheck your baby's BMI and weight-for-length percentile using CDC/WHO charts.
Frequently asked questions
Which sources and method does this tool use?
The method, version and primary sources are listed in the evidence section above.
Why might Baby Weight Percentile Calculator differ from a clinic visit?
Home measurements, rounding, age calculation, units, and reference choices can all shift the result. Use the same measurement method over time and bring concerns to your pediatrician.
What should I compare with this result?
Compare it with Baby Height Percentile Calculator, Baby Head Circumference Calculator, Baby BMI & Weight-for-Length Calculator, recent trends, feeding or sleep notes, and your child's usual behavior. A steady pattern is usually more informative than one isolated value.