Baby Weight Percentile Calculator
Where your baby's weight sits.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Estimated percentile
- 37.1%
- Median weight for age
- 7.9 kg
- Z score
- -0.33
- Difference from median
- -0.3 kg
- Interpretation
- Within typical range
Quick answer
A weight percentile shows the share of babies of the same age and sex who weigh less than yours.
How to use the Baby Weight Percentile Calculator
- 1Enter your baby's age in whole months (0–12).
- 2Enter weight in kilograms.
- 3Select boy or girl.
Frequently asked questions
Is a low percentile a problem?
Not on its own — steady growth along a curve matters more than the number.
Is this a medical tool?
No, it is an estimate; your paediatrician uses the full WHO tables.