How to find the next birthday
Enter a birth date and the date to count from.
1
Enter the birth date
The month and day define the recurring birthday.
2
Set the reference date
Use today or a date in the future to check that year.
3
Read the result
The main result includes the weekday and the rows show days away and age turning.
What does this tool do?
Birthdays recur on the same calendar date each year, except for 29 February. This calculator finds the next occurrence, the age the person will turn and the number of days from a chosen reference date.
The Formula
Next birthday = Birth month and day in the current year, or next year if already passedFrequently Asked Questions
What happens when the birthday is today?
The next birthday is today, so the date row matches the reference date and the days-away value is zero.
How is the age at the next birthday calculated?
The calculator subtracts the birth year from the year of the next occurrence. That matches the age reached on the birthday itself.