Months Until Birthday
Enter a date of birth to find out precisely how long remains until the next birthday, down to the month.
About this calculator
This months until birthday finds the very next occurrence of a birthday — even if it already happened this calendar year — and counts down the gap in months.
It automatically rolls forward to next year if this year's date has already passed, and handles the rare case of a February 29th birthday by using February 28th as the observed date in non-leap years.
How it works
Enter the date of birth
The month and day are what matter most — the year is used to display the birth weekday.
Calculate
The tool finds the next upcoming occurrence of that month and day, whether that's later this year or early next year.
See the countdown
View the exact countdown in months, plus the exact date and day of the week the next birthday falls on.
Frequently asked questions
What happens if the birthday already passed this year?
The calculator automatically counts down to next year's date instead of showing a negative number.
How does it handle a February 29th birthday?
In non-leap years, the observed date is treated as February 28th; the calculator notes when a 'real' February 29th birthday is coming up.
Can I use this for anniversaries instead of birthdays?
Yes — any recurring annual date works the same way, so it doubles as an anniversary countdown.
Does the countdown update automatically?
It calculates based on today's date each time you run it — reload the page or recalculate to refresh the count.