Free online baby weight percentile calculator based on WHO (World Health Organization) growth standards for 0-24 months. Enter your baby's gender, age, and weight to calculate their percentile ranking among peers. Help parents understand their baby's growth scientifically. | No registration · Data never leaves your device
Based on WHO standards · Works offlineEnter your baby's details to see how their weight compares
| Month | Boy P3 | Boy P50 | Boy P97 | Girl P3 | Girl P50 | Girl P97 |
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1. Select your baby's gender.
2. Enter your baby's age in months (0-24 months).
3. Enter your baby's weight in kg or lbs (1 lb = 0.4536 kg).
4. Click "Calculate" to see the percentile ranking.
The percentile shows where your baby's weight ranks among peers of the same age and gender. For example, P75 means your baby is heavier than 75% of babies. P3-P97 is considered the normal range.
Below P3 may indicate underweight, above P97 may indicate overweight. However, growth trends matter more than single measurements. Consult a pediatrician if concerned. This tool is for reference only, not medical advice.
This calculator uses WHO 2006 Child Growth Standards, covering 0-24 months weight-for-age percentiles. It's the globally recognized gold standard.
Full-term newborns typically weigh 2.5-4.0 kg (5.5-8.8 lbs), with a median of about 3.3 kg (7.3 lbs). Below 2.5 kg is considered low birth weight.