Birthday Calculator
Count down to your next birthday and find the weekday you were born on.
About the Birthday Calculator
Enter your date of birth to see how many days are left until your next birthday, the age you'll turn, which weekday it falls on, the weekday you were born on and how many days you've been alive.
If you were born on 29 February, the calculator marks your birthday on 28 February in non-leap years, which matches the legal convention in many countries.
The formula
Days to birthday = next birthday − today
Worked example
Born 15 June 1990, checked on 11 November 2026
- Next birthday: Tuesday 15 June 2027, turning 37
- 216 days to go
- Born on a Friday; 13,298 days alive so far
Questions people ask
How many days have I been alive?
Shown under “Days alive”.
Does my birthday fall on the same weekday every year?
No, it moves on one weekday each year, or two after 29 February.