How it's calculated
days = ⌊(next birthday − now) ÷ 1 day⌋
next birthday = the upcoming anniversary of the birth date, now = current moment. Age turning = next-birthday year − birth year.
Common questions
When do people born on Feb 29 celebrate their birthday?
In non-leap years there is no Feb 29, so most leaplings mark it on Feb 28 or Mar 1. The countdown picks one consistently for the year.
How many days until my birthday?
Enter your birth date and the tool counts from today to your next birthday, refreshing the days, hours, and seconds live.