A birthday calculator tells you exactly how many days until your next birthday, what day of the week your birthday falls on, your exact age in years and days, your birthstone, and your zodiac star sign. Enter your date of birth below for your complete birthday profile!
📅 Daily Life
🎂 Birthday Calculator
Find days until your next birthday, your zodiac sign, birthstone, birth day of week, and fun facts about your birthday. Create a complete birthday profile instantly!
✏️ Enter Your Values
✨ Your Result
🦉Owl's Explanation
🎂
Fill in the values above and click Calculate ✨
🤔 How Does This Work?
The Birthday Calculator combines several calculations:
Days until birthday: finds your next birthday date and calculates the difference from today
Day of week: uses the Zeller's formula to find what day of the week any date falls on
Zodiac sign: matches your birth month and day to the 12 zodiac sign date ranges
Birthstone: matches your birth month to the traditional birthstone for that month
Age: calculates exact age in years, months, and days
✅ Trusted Tool
The 365tool.net Birthday Calculator is a fun, free tool for discovering birthday facts. Zodiac and birthstone information is for entertainment purposes. All calculations run in your browser — your data stays private. No sign-up needed.
❓ FAQ
What day of the week was I born?▼
Enter your date of birth in our Birthday Calculator and it instantly shows what day of the week you were born! You can verify with historical calendar records.
A birthstone is a gemstone associated with the month of your birth. January=Garnet, February=Amethyst, March=Aquamarine, April=Diamond, May=Emerald, June=Pearl, July=Ruby, August=Peridot, September=Sapphire, October=Opal, November=Topaz, December=Turquoise.
How do I find out how many days until my birthday?▼
Enter your date of birth in our Birthday Calculator! It automatically calculates the exact number of days, weeks, and months until your next birthday from today.
What if my birthday is on February 29 (leap year)?▼
People born on February 29 celebrate on February 28 or March 1 in non-leap years. Our calculator correctly handles leap year birthdays and shows your next birthday date accurately.