Zodiac Sign Calculator
Determine your Western astrological Sun Sign, planetary ruler, element, and modality from your birth date.
Input Parameters
Live Result
Details
Quick Answer & Understanding Your Result
A Zodiac Sign Calculator determines your astrological Sun Sign and element based on the Sun's ecliptic path on your Gregorian birth date.
The 12 Western Zodiac Signs & Dates
- Aries (Fire): March 21 – April 19 | Ruler: Mars
- Taurus (Earth): April 20 – May 20 | Ruler: Venus
- Gemini (Air): May 21 – June 20 | Ruler: Mercury
- Cancer (Water): June 21 – July 22 | Ruler: Moon
- Leo (Fire): July 23 – August 22 | Ruler: Sun
- Virgo (Earth): August 23 – September 22 | Ruler: Mercury
- Libra (Air): September 23 – October 22 | Ruler: Venus
- Scorpio (Water): October 23 – November 21 | Ruler: Pluto / Mars
- Sagittarius (Fire): November 22 – December 21 | Ruler: Jupiter
- Capricorn (Earth): December 22 – January 19 | Ruler: Saturn
- Aquarius (Air): January 20 – February 18 | Ruler: Uranus / Saturn
- Pisces (Water): February 19 – March 20 | Ruler: Neptune / Jupiter
Select your birth day and month above to discover your Sun Sign and elemental blueprint instantly.
Formula & Calculation Logic
Mathematical FormulaAstronomical mapping principle:
- Divides the 360° celestial sphere into twelve 30° sectors starting at the Vernal Equinox (0° Aries).
- Maps calendar birth dates to corresponding tropical zodiac sectors.
Step-by-Step Guide
Select Birth Month
Choose your Gregorian month of birth.
Select Birth Day
Select your exact calendar birth date.
View Complete Zodiac Profile
Receive your Sun Sign, element, quality (Cardinal/Fixed/Mutable), and ruling planet.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Born on August 15 | Falls in the Leo date range (July 23 to August 22). | ||
| Leo Leader (August 8) | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
Astrological Association of Great Britain
International Society for Astrological Research (ISAR)
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Zodiac Sign = LookupTropicalEcliptic(BirthMonth, BirthDay)
Last Reviewed: August 21, 2026
Primary Source: Astrological Association of Great Britain
Reference Document: International Society for Astrological Research (ISAR)
Computation Privacy: 100% client-side 0ms computation, zero data retention
Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.