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What this calculator does
Count down to the next birthday and show the upcoming date.
How to use this calculator
- Enter the birth month and day.
- Review the calculation assumptions before using the result.
- The result updates for the next occurrence.
How to calculate
Choose the calculation mode where available, then enter the values requested by the birthday calculator. Results update immediately.
Worked example
With the example values shown above, the current age is 35 years 9 months 12 days.
Understanding your result
The result updates for the next occurrence.
- Leap-day birthdays follow local conventions in non-leap years.
- Double-check values and units before calculating.
Frequently asked questions
What does this birthday calculator do?
Count down to the next birthday and show the upcoming date.
How do I use this birthday calculator?
Enter the birth month and day.
What does the result mean?
The result updates for the next occurrence.
What should I check before relying on it?
Leap-day birthdays follow local conventions in non-leap years.
What happens if today is my birthday?
The countdown shows zero days remaining, since the next birthday is today itself — it updates to count down to next year's birthday shortly after midnight.
How are leap-day (February 29) birthdays handled in non-leap years?
Common conventions treat a leap-day birthday as falling on either February 28 or March 1 in non-leap years — double-check which convention applies to your context if the exact day matters.