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Next Birthday Countdown Calculator
Count the days until your next birthday and the age you will turn.
Date of birth
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How it works
Days = next occurrence of your birth month/day − today
The calculator finds the next time your birth month and day come around from today, counts the days to it, and works out the age you will reach and which weekday it falls on.
Worked example
For a June 15 birthday, it counts the days from today to the next June 15.
Frequently asked questions
What about February 29 birthdays?
In non-leap years it rolls to the following valid date; leap-day birthdays are a fun edge case.
Is it based on my timezone?
It uses the date only, so it is stable regardless of the exact time of day.
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This calculator is for educational purposes. Double-check important results before acting on them.