📅 Date & Time
Baby Age Calculator
Babies are measured in weeks for the first months and in months thereafter, so both are useful at once. This calculator also shows the corrected age for babies born early.
How it works
Date of birth
Original due date (for premature babies)
Days old
Weeks old
Months old
Age
Corrected age
Frequently asked questions
How do I use the Baby Age 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.