Age in Weeks Calculator
Track age in weeks.
Calculate age in weeks instantly. Free weeks-old calculator for babies and milestones.
Calculator Inputs
About Age in Weeks
Track age in weeks.
Converts elapsed days to weeks + days.
Where it is used
Baby milestones, project age.
How to use the Age in Weeks
- Date of Birth — enter the value.
- Calculate — press the Calculate button to see the result instantly above.
Formula
floor(days/7) weeks + remainder days.
Examples
Example
dob:2026-01-01
Result: ≈ 36 weeks 2 days
Frequently Asked Questions
- Why "weeks old"?
- Common for newborns (< 1 year old).