Birthday Calculator
Find your exact age, the day you were born, days until your next birthday, and check if you have a leap year birthday.
Birthday Details
Birthday Calculator gives you detailed information about your birth date.
What it calculates:
- Exact age in years, months, and days
- Day of the week you were born
- Days until your next birthday
- Leap year birthday check (Feb 29)
- Total days you have been alive
Fun facts about birthdays:
- September is the most common birth month in the US
- The most common birthday is September 9th
- The least common birthday is February 29th (leap day)
- You share your birthday with approximately 20.8 million other people worldwide
- The odds of two people in a group of 23 sharing a birthday is 50% (the birthday paradox)
Leap year rules:
- Divisible by 4 — leap year
- Divisible by 100 — NOT a leap year
- Divisible by 400 — leap year again