Birthday Calculator — Days Until Next Birthday
Find out how many days until your next birthday, what day of the week you were born, your zodiac sign, birthstone, and Chinese zodiac animal. Try our Age Calculator for detailed age breakdown or the Date Calculator for date arithmetic.
How to Calculate Days Until Your Next Birthday
- Enter your date of birth in the input field.
- Click Calculate to see your results.
- View your next birthday date, countdown, zodiac sign, and life statistics.
- Your Chinese zodiac is determined by your birth year in the 12-year cycle.
- Your birthstone is based on your birth month.
Formula
Next Birthday = birth_month/birth_day of current or next year
Days Until = Next Birthday - Today (in days)
Age = current_year - birth_year (adjusted if birthday hasn't occurred)
Example
Date of Birth: June 15, 1990
Today: January 10, 2025
Next Birthday: June 15, 2025 (Sunday)
Days Until: 156 days
Age: 34 years
Zodiac: Gemini (Air) | Birthstone: Pearl | Chinese Zodiac: Horse
Zodiac Signs Reference Table
| Sign | Dates | Element | Birthstone |
|---|---|---|---|
| Capricorn | Dec 22 - Jan 19 | Earth | Garnet |
| Aquarius | Jan 20 - Feb 18 | Air | Amethyst |
| Pisces | Feb 19 - Mar 20 | Water | Aquamarine |
| Aries | Mar 21 - Apr 19 | Fire | Diamond |
| Taurus | Apr 20 - May 20 | Earth | Emerald |
| Gemini | May 21 - Jun 20 | Air | Pearl |
| Cancer | Jun 21 - Jul 22 | Water | Ruby |
| Leo | Jul 23 - Aug 22 | Fire | Peridot |
| Virgo | Aug 23 - Sep 22 | Earth | Sapphire |
| Libra | Sep 23 - Oct 22 | Air | Opal |
| Scorpio | Oct 23 - Nov 21 | Water | Topaz |
| Sagittarius | Nov 22 - Dec 21 | Fire | Tanzanite |
Frequently Asked Questions
How is the zodiac sign determined?
Western zodiac signs are based on the position of the sun at the time of birth. Each sign covers approximately 30 days, starting with Aries on March 21.
What is the Chinese zodiac cycle?
The Chinese zodiac follows a 12-year cycle, with each year assigned an animal: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig.
Are birthstones the same worldwide?
The modern birthstone list was standardized by the American Gem Society in 1912. Some months have alternative stones in different traditions.
What if I was born on February 29?
If born on a leap day, your next birthday in non-leap years would technically be March 1. The calculator counts days to the actual date occurrence.
How accurate is the day of week calculation?
The day of week calculation is 100% accurate for any date in the Gregorian calendar, which has been in use since October 15, 1582.