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Use this birthday calculator for a clear date & time estimate. Results update instantly in your browser.
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
Current age is the calendar difference on the selected date. The live birthday countdown ends at midnight on the next local birthday.
Choose the calculation mode where available, then enter the values requested by the birthday calculator. Results update immediately.
Worked example
The defaults provide a complete worked example. Change any value to recalculate the result and any schedule shown.
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.