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Find your next birthday, days until birthday, day of the week, upcoming milestones, and total days lived. Plan perfect birthday celebrations.
Please select your birth date
Date of Birth
This calculator provides accurate birthday calculations based on the Gregorian calendar. Milestone ages are based on common cultural celebrations.
If you were born on February 29 (leap day), your birthday is celebrated on February 28 or March 1 in non-leap years, depending on local custom.
A birthday calculator is a specialized tool that provides comprehensive birthday information based on your date of birth. It shows when your next birthday falls, how many days until that date, what day of the week it will be, and your age on that birthday. It also calculates upcoming milestone birthdays and total days lived, helping with birthday party planning and milestone celebrations.
The calculator uses your birth date and the current date to determine when your next birthday occurs. If your birthday hasn't happened yet this year, it's the anniversary of your birth date in the current year. If it has already passed, the next birthday is in the following year. The calculator counts the days until that date, determines the day of the week, and identifies upcoming milestone birthdays.
See exactly how many days until your next birthday with automatic countdown
Discover upcoming milestone birthdays (sweet sixteen, 21st, 50th, 100th)
Find out what day of the week your next birthday falls on
Calculate total days you've been alive for interesting life perspective
Your golden birthday is when you turn the age matching your birth day (e.g., 15 on the 15th)
If born on February 29, celebrate on February 28 or March 1 in non-leap years
Weekend birthdays are easier for parties; weekday ones may need adjusted dates
Some celebrate half-birthdays, especially children born near major holidays
Enter your birth date in the calculator, and it will show exactly how many days remain until your next birthday. The countdown automatically accounts for whether your birthday has already occurred this year or is still upcoming.
Milestone birthdays are culturally significant ages marking important life transitions. Common milestones include: Sweet Sixteen (16), legal adulthood (18), 21st, Quarter Century (25), 30th, 40th, Golden Jubilee (50), Diamond Jubilee (60), retirement age (65), and Centenarian (100).
A golden birthday occurs when you turn the same age as the day of the month you were born. For example, if you were born on the 15th, your golden birthday is when you turn 15. If born on the 28th, it's your 28th birthday.
If you were born on February 29, you only have a 'real' birthday every 4 years during leap years. In non-leap years, people typically celebrate on February 28 or March 1. Legally, you age normally every year.
Enter your birth date and the calculator will show you what day of the week you were born on. This is calculated using the Gregorian calendar. Many people find it interesting to know they were born on a particular day.
The calculator shows what day of the week your birthday falls on, helping you decide whether to celebrate on the actual day or the nearest weekend. It also shows how much time you have to plan.
The calculator shows your total days lived from your birth date to today. For example, someone who is 30 years old has lived approximately 10,950 days (accounting for leap years).
Milestone birthdays mark significant life transitions and achievements. They provide natural moments for reflection, celebration, and gathering loved ones. Sweet Sixteen, 18, 21, 50, and 100 are particularly significant occasions.