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Zodiac Sign Calculator

Date & Time

Birth date to star sign with dates and elements

Quick Answer

Zodiac Sign Calculator: Birth date to star sign with dates and elements. Aries 3.21–4.19 · Taurus 4.20–5.20 · Gemini 5.21–6.21 · Cancer 6.22–7.22 · Leo 7.23–8.22 · Virgo 8.23–9.22 · Libra 9.23–10.23 · Scorpio 10.24–11.22 · Sagittarius 11.23–12.21 · Capricorn 12.22–1.19 · Aquarius 1.20–2.18 · Pisces 2.19–3.20.

6 / 1
Gemini
5/21 – 6/21 · Air · Ruled by Mercury
Zodiac signGemini
ElementAir
Ruling planetMercury
TraitsWitty, versatile, curious

Calculation steps

  1. 1Birthday: month 6, day 1
  2. 2Compare against the 12 sign date ranges (mainstream Western astrology boundaries)
  3. 36/1 falls in Gemini (5/21 – 6/21)
  4. 4Element group: Air — Aquarius, Gemini, Libra

All 12 zodiac signs

SignDatesElementRuler
Capricorn12/22 – 1/19EarthSaturn
Aquarius1/20 – 2/18AirUranus
Pisces2/19 – 3/20WaterNeptune
Aries3/21 – 4/19FireMars
Taurus4/20 – 5/20EarthVenus
Gemini5/21 – 6/21AirMercury
Cancer6/22 – 7/22WaterMoon
Leo7/23 – 8/22FireSun
Virgo8/23 – 9/22EarthMercury
Libra9/23 – 10/23AirVenus
Scorpio10/24 – 11/22WaterPluto
Sagittarius11/23 – 12/21FireJupiter
About Ophiuchus: astronomically the Sun passes through 13 constellations including Ophiuchus (Nov 29 – Dec 17), but Western astrology uses a 12-sign system fixed to the seasons (tropical zodiac), not the actual constellations — so the traditional 12 signs remain the standard. Zodiac signs are for entertainment and cultural reference.

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How to Use

  1. Pick dates or a mode: select start/end dates or switch modes in the Zodiac Sign Calculator.
  2. Instant calculation: results appear immediately with day/week/month equivalents.
  3. Solve both ways: change any field and everything updates — forward or reverse.
  4. Check the context: read the solar-term/holiday/rule notes on this page.

Key Points

  • Zodiac Sign Calculator is a free online date & time tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Birth date to star sign with dates and elements.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Zodiac sign dates (solar calendar)

Aries 3.21–4.19 · Taurus 4.20–5.20 · Gemini 5.21–6.21 · Cancer 6.22–7.22 · Leo 7.23–8.22 · Virgo 8.23–9.22 · Libra 9.23–10.23 · Scorpio 10.24–11.22 · Sagittarius 11.23–12.21 · Capricorn 12.22–1.19 · Aquarius 1.20–2.18 · Pisces 2.19–3.20

Elements: Fire, Earth, Air, Water. Lunar birthdays must be converted to solar first.

FAQ

How do I use the Zodiac Sign Calculator?
Open the page and fill in the input fields — results update automatically. Birth date to star sign with dates and elements.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on standard calendar arithmetic. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Zodiac Sign Calculator[EB/OL]. https://www.yijiansuan.com/en/c/date/constellation

Results provided by this tool are for reference only and do not constitute professional advice.