Age in Weeks Calculator

The age in weeks calculator tells you how many weeks old you are. Enter your date of birth and it counts the exact number of whole weeks since you were born, plus the leftover days, and shows the full age breakdown alongside.

Counting age in weeks is common in the first months of life, when babies' growth and milestones are tracked week by week rather than in months. It is also a striking way to see the passage of time for any age — a number in the hundreds or thousands of weeks lands differently from the same span in years, which is part of why "your life in weeks" has become such a popular way to reflect on time.

The calculation is simple and exact: the total number of days you have been alive is divided into seven-day weeks, with any remaining days shown separately. Because it counts real days, leap years are already accounted for, and the result is anchored to UTC so it never drifts with your time zone. The breakdown also gives your age in months, days, and hours, and the weekday you were born on.

To use it, choose your date of birth and press Calculate age. The result appears instantly and is computed privately in your browser. If you would rather see whole months, the age in months calculator presents the same span that way, the age in days calculator gives the raw day count, and the full age calculator breaks everything into years, months, and days.

The calculator counts the total days from your date of birth to today, then divides by seven to give whole weeks, showing any remaining days separately. Because it works from an exact day count, leap years are already included and the result is timezone-safe.