How to Calculate Birthday Calculator

What is Birthday Calculator?

A birthday calculator computes your exact age in years, months, days, hours, and even seconds. It can also calculate how many days until your next birthday, what day of the week you were born, and your star sign.

Step-by-Step Guide

1. 1Subtract the birth date from today's date
2. 2Handle leap years (Feb 29 birthdays fall on Mar 1 in non-leap years)
3. 3Days until next birthday = Next birthday date − Today's date

Worked Examples