Baby Percentile Calculator (WHO Growth Standards)

Your details

WHO growth charts are sex-specific because boys and girls grow at different rates.
Age in completed months (0 = newborn at birth). Decimal values like 6.5 are allowed for half-months.
months
Your baby's current weight. Leave at 0 to skip weight percentile.
kg
Measured lying down for babies under 24 months (recumbent length). Leave at 0 to skip.
cm
Measured at the widest point (occipitofrontal circumference). Leave at 0 to skip.
cm
Weight percentileNormal range (15th-85th)
48.4th percentile

Where your baby's weight falls among babies of the same age and sex

Weight z-score-0.04
Length percentile49.6th percentile
Length z-score-0.01
Head circumference percentile49th percentile
Head z-score-0.03
WHO median weight for age7.93
WHO median length for age67.6
48.4 th pct46.9% below · Percentile

Weight: 48.4th percentile (Normal range (15th-85th)) | Length: 49.6th percentile | Head: 49th percentile

  • Your baby's weight places them in the Normal range (15th-85th) on the WHO chart.
  • The WHO median weight for a 6-month boy is 7.93 kg.
  • The WHO median length at this age is 67.6 cm.
  • Percentile is not a grade: anywhere from the 3rd to the 97th is within the normal range. What matters most is a consistent growth trend over time.

Next stepBring this calculator's output to your baby's next well-child visit. Pediatricians look at growth trends across multiple visits, not a single measurement. If your baby has consistently followed the same percentile curve, that is reassuring even if the number is low or high.

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