🏃 Health & Fitness
Baby Growth Calculator
Growth charts describe populations, not individuals: a healthy baby on the tenth centile who tracks steadily is in better shape than one on the fiftieth centile who has just dropped two bands. Use this as a rough sanity check against the averages, and let your paediatrician read the trend.
How it works
Baby’s age
Sex
Birth weight
Current weight
Current length
Average weight for this age
Average length for this age
Difference from average
Where this sits
Typical daily weight gain
Typical daily milk volume
Typical feeds per day
Next milestone to watch
Frequently asked questions
How do I use the Baby Growth Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.