Birthday Week Calculator
Find out which week of the year you were born. Learn your birthday week number, the day of the week you were born, and total weeks you've lived.
Understanding Birthday Weeks
The year has 52 weeks, and each birthday falls into one of these weeks. Week 1 includes January 1-7, week 2 includes January 8-14, and so on through week 52 in late December.
Knowing your birthday week can be fun for comparing with friends and family. People born in the same week share a "birthday week" even if their exact dates differ.
This calculator also shows the total number of weeks you've been alive — a unique way to measure your age beyond just years.
How to Use This Calculator
- Enter your date of birth
- Click "Calculate Birthday Week"
- See your birthday week number and day of the week
- Learn how many total weeks you've been alive