How to use the age in weeks calculator
Supply the birth date and your chosen as-of date. Seven completed days make one week.
How the calculation works
Week counts are useful for short periods such as early childhood, but months and weeks are different units: a calendar month is not exactly four weeks.
Check your inputs carefully: an incorrect date can change a result. Dates and times are entered using your device settings, and no account is needed. For formal, legal, medical or financial purposes, verify the applicable local rules and official records.
Frequently asked questions
How is a partial week displayed?
For example, 45 days is shown as 6 weeks and 3 days.
Does the calculator account for leap years?
Yes. AgeGlide uses calendar-based calculations and includes 29 February where applicable.
Are the dates I enter uploaded?
No. AgeGlide calculates your results in your browser. Entered dates are not sent to our server for processing.