What is the Birthday Calculator?
Find the weekday you were born, your zodiac sign and days until your next birthday. Dates are deceptively tricky — months have different lengths and leap years shift everything. These date and time calculators handle calendar math exactly, using UTC to avoid daylight-saving surprises.
How to use the Birthday Calculator
- Enter your birth date.
- Results update automatically as you type; you can also press Calculate.
- Read the output: born on a, zodiac sign, chinese zodiac, days alive.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With birth date = 1995-08-23, the Birthday Calculator returns born on a: Wednesday; zodiac sign: Virgo; chinese zodiac: Pig (by calendar year).
Tips for better results
- Decide whether you need to include the end date when counting days.
- Business-day counts exclude weekends but not public holidays unless you subtract them.
- Timestamps are shown in UTC; convert to your local time zone as needed.
Frequently asked questions
What does the Birthday Calculator do?
Find the weekday you were born, your zodiac sign and days until your next birthday.
How is it calculated?
The Birthday Calculator uses this method: Weekday from the Gregorian calendar; tropical zodiac date ranges.
Can you show an example?
With birth date = 1995-08-23, the Birthday Calculator returns born on a: Wednesday; zodiac sign: Virgo; chinese zodiac: Pig (by calendar year).
Is the Birthday Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Birthday Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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