Baby Growth Percentile Calculator (CDC/WHO charts)

Baby Growth Percentile Calculator (WHO & CDC)

Calculate z-score and percentile from WHO or CDC growth standards using the LMS method. For infants and children — educational only. If you have concerns, contact a healthcare professional.

Chart standard WHO (0–59 months) CDC (birth → 20 years) Sex Male Female Measurement type Weight-for-age (kg) Length/height-for-age (cm) Head circumference-for-age (cm) Age (months, decimals allowed) Measurement value

Results

Guidance

• Percentiles are a population comparison, not a diagnosis. Look for trends over time.
• For infants 0–24 months, WHO standards are recommended by WHO; CDC provides data and tools too. Use clinical judgement.
• If percentiles track very low (<3rd) or very high (>97th), or fall quickly, consult a pediatrician.

Sources: WHO child growth standards; CDC growth charts (LMS data). Links at the end of the page.

Need accurate, clinic-ready results?

If you want, I can embed the exact LMS parameter JSON for WHO and CDC into the page so calculations work offline (recommended). I can also add charts (plots), downloadable PDF growth report, and a pediatrician-friendly export.