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Instant result
The result is updated directly from the data entered.
Online Calculator
Next birthday calculator
Enter your date of birth to see how long it is until your next birthday.
Information
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Local processing
The calculations are done in your browser without sending the values to a server.
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Free
No registration, subscription, or paid API required.
Frequently asked questions
What does this tool calculate?
Find your next birthday, the days remaining, and the age you will turn.
Can I change the reference date?
Yes.
What if my birthday is today?
The result indicates zero days.
Do the calculations depend on the time zone?
Calendar dates are processed in UTC to prevent one-day shifts.