How the Zodiac Calculator Works
The Western (tropical) zodiac splits the year into 12 date ranges, one for each sign. The zodiac calculator reads your birth month and day, finds the range that contains that date and returns the matching sun sign with its element (fire, earth, air or water), quality (cardinal, fixed or mutable), ruling planet, common traits and the signs it is most often paired with. Your birth year is not needed, and nothing you enter leaves your browser.
Zodiac Calculator Examples
- August 22 falls inside Jul 23 – Aug 22, so the result is Leo. One day later, August 23, is the first day of Virgo.
- January 5 belongs to Capricorn, the one sign whose range crosses New Year (Dec 22 – Jan 19).
- March 20 is the last day of Pisces; March 21 starts Aries, the first sign of the astrological year.
If you were born within a day of a boundary, keep in mind that the Sun's exact entry into a sign can move by about a day from one year to the next. The fixed ranges used here match most published horoscopes; an ephemeris with your birth year and time settles true cusp cases.
Zodiac Sign Dates
The table lists every range the calculator uses. Signs with a dedicated guide are linked; you can also browse the zodiac signs overview or check how two signs get along in zodiac compatibility.
| Sign | Dates | Element | Quality |
|---|---|---|---|
| ♈ Aries | Mar 21 – Apr 19 | Fire | Cardinal |
| ♉ Taurus | Apr 20 – May 20 | Earth | Fixed |
| ♊ Gemini | May 21 – Jun 20 | Air | Mutable |
| ♋ Cancer | Jun 21 – Jul 22 | Water | Cardinal |
| ♌ Leo | Jul 23 – Aug 22 | Fire | Fixed |
| ♍ Virgo | Aug 23 – Sep 22 | Earth | Mutable |
| ♎ Libra | Sep 23 – Oct 22 | Air | Cardinal |
| ♏ Scorpio | Oct 23 – Nov 21 | Water | Fixed |
| ♐ Sagittarius | Nov 22 – Dec 21 | Fire | Mutable |
| ♑ Capricorn | Dec 22 – Jan 19 | Earth | Cardinal |
| ♒ Aquarius | Jan 20 – Feb 18 | Air | Fixed |
| ♓ Pisces | Feb 19 – Mar 20 | Water | Mutable |
These are tropical zodiac dates, tied to the seasons rather than to where the constellations sit in the sky today. Background on how the 12 signs were defined is available in the astrological sign article on Wikipedia.