Birthday Weekday Finder
Enter a birth date and year to find the weekday of your birthday, the age reached that year, and upcoming birthday weekdays.
Last updated: July 2026
Your result
Upcoming birthday weekdays
This is a calendar convention only. Legal treatment of birthdays, especially leap-day birthdays, can vary by jurisdiction.
What this birthday weekday finder tells you
Use this tool to see what weekday a birthday fell on or will fall on in a selected year, as well as the age reached and the surrounding birthdays around that year.
Why birthday weekdays change
Birthdays move across the week because a calendar year is not an exact multiple of seven days. The weekday can shift forward or backward over time.
Leap years and February 29 birthdays
For a February 29 birthday, the calculator uses February 29 in leap years and February 28 in non-leap years for the displayed calendar birthday. Legal handling of leap-day birthdays can vary by jurisdiction.
Worked example
Birth date: May 17, 1990. Year to check: 2026. The original birth weekday is Thursday, the birthday in 2026 is May 17, 2026, the weekday is Sunday, and the age reached is 36.
Frequently asked questions
What day of the week was I born?
The tool shows the weekday for the original birth date.
Why does my birthday move to a different weekday?
Because the calendar repeats on a 365-day cycle and a year is not an exact multiple of 7 days.
How do leap years affect birthday weekdays?
Leap years can shift the weekday of a birthday by one or more days, depending on the year.
How are February 29 birthdays handled?
They use February 29 in leap years and February 28 in non-leap years for the displayed calendar birthday.
Can I check a past or future year?
Yes. Choose any year from 1 to 9,999 that is not earlier than the birth year.
Is this suitable for legal age decisions?
No. This is informational only and not legal-age advice.