Birthday Calculator
Calculate days until your next birthday and find out interesting facts about your birth date.
Enter Birth Date
Table of Contents
Birthday Calculations
Birthday calculations help you determine important information about your next birthday, including how many days are left until it arrives and how old you'll be.
- Days until next birthday
- Next birthday date
- Age at next birthday
Birthday Facts
Interesting facts about birthdays:
- About 1 in 1,461 people are born on February 29th (Leap Day)
- The most common birthday is September 9th
- The least common birthday is December 25th
Practical Examples
Example 1 Basic Birthday Calculation
Calculate birthday info for birth date: January 1, 2000
Next Birthday: January 1, 2025
Age at Next Birthday: 25 years
Example 2 Birthday in Current Month
Calculate birthday info for birth date: March 15, 2000
Next Birthday: March 15, 2024
Age at Next Birthday: 24 years
Example 3 Leap Year Birthday
Calculate birthday info for birth date: February 29, 2000
Next Birthday: February 29, 2024
Age at Next Birthday: 24 years