Age To Birthday Calculator
The Days Until Birthday Calculator counts how many days remain until your next birthday. Enter your birth date and it finds the next occurrence of that day and counts the days from today.
Formula
Days Until = Next Birthday − Today
- The calculator takes the month and day of your birth and finds the next time it occurs.
- If this year's birthday has already passed, it counts to next year's.
- The result is the whole number of days from today until that date.
- If today is your birthday, the count is zero.
Example Calculation
Inputs
- Birth Date: 2000-01-01
For a birthday of 1 January, the calculator counts the days from today until the next 1 January.
Frequently asked questions
How many days until my birthday?
Enter your date of birth and the calculator returns the number of days from today until your next birthday.
What if my birthday already passed this year?
It automatically counts to next year's birthday.
What happens on my birthday?
On the day itself the countdown is zero.
Does the birth year matter?
No. Only the month and day are used to find your next birthday.
How are leap-day birthdays handled?
A 29 February birthday lands on that date in leap years; in other years the calculator uses the equivalent date your browser computes.