WHO Infant Growth Percentile & Z-Score Calculator (Weight & Length for Age)
Track your baby's growth milestone from birth to 24 months by calculating exact Weight-for-Age and Length-for-Age percentiles and Z-scores based on official World Health Organization (WHO) Child Growth Standards.
Weight-for-Age Percentile
Calculator Inputs
Weight-for-Age Percentile
Length-for-Age Percentile
Weight Z-Score (Standard Deviations)
WHO 50th Median Weight
Weight vs Length Growth Percentile Comparison
Informational pediatric growth tracking tool. Steady progression along an individual growth curve is the primary indicator of healthy infant development.
This tool is a mathematical wellness and fitness estimation model for general educational guidance only. The results do not constitute medical diagnosis, clinical advice, or treatment plans. Always consult a qualified physician or certified dietitian before starting any dietary regimen, exercise program, or making health decisions.
Calculation Methodology
WHO LMS Method: Z-score = [(Value/M)^L - 1] / (L * S). Percentile is derived from the standard normal cumulative distribution function.
Frequently Asked Questions
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