How to count days to a birthday
Enter the birth date and the day to count from.
1
Enter the birth date
Month and day set the birthday; the year sets the age.
2
Set the counting date
Use today or another date for a planned celebration.
3
Check the next date
The result rolls to next year once the birthday has passed.
What does this tool do?
The countdown resets on the birthday itself, so the result is always the gap to the next occurrence. Enter the birth date and a counting date to check a specific day rather than only today.
The Formula
Days = Next birthday − Reference dateFrequently Asked Questions
Does the birthday itself count as zero days?
Yes. On the birthday the next occurrence is that same day, so the result is zero and the row shows the current date.
What if the birthday is today?
The main result reads 0 days (today). Set the counting date to tomorrow to see the start of the next year of the countdown.