Time & Date
Birthday Calculator
Find your current age, next birthday date, countdown days, and the weekday you were born.
Educational estimates only. Not medical, legal, tax, or financial advice.
Guide: Birthday Calculator
What it does
Calculates age, next birthday, days remaining, and the weekday of a birth date.
How to use it
Enter a birth date. The reference date defaults to today, but you can change it for planning or testing.
Formula
Next birthday = next occurrence of birth month/day on or after the reference date.
Example
Birth date 2000-06-10 and reference date 2026-05-27 gives age 25 and 14 days until the next birthday.
FAQs
How does the birthday calculator find my next birthday?
It compares your birth month and day with the reference date, then uses this year or next year for the next upcoming birthday.
Does it handle leap day birthdays?
For February 29 birthdays in non-leap years, this calculator uses February 28 as a practical observed birthday date.
Is the calculated age legal advice?
No. The result is a general calendar calculation. Legal age rules can vary by country, time, and local policy.