Birth Chart Calculator
Zodiac Signs Reference
All 12 Western zodiac signs with their dates, elements, and modalities.
| Sign | Dates | Element | Modality | Ruling Planet |
|---|---|---|---|---|
| Aries | Mar 21 – Apr 19 | Fire | Cardinal | Mars |
| Taurus | Apr 20 – May 20 | Earth | Fixed | Venus |
| Gemini | May 21 – Jun 20 | Air | Mutable | Mercury |
| Cancer | Jun 21 – Jul 22 | Water | Cardinal | Moon |
| Leo | Jul 23 – Aug 22 | Fire | Fixed | Sun |
| Virgo | Aug 23 – Sep 22 | Earth | Mutable | Mercury |
| Libra | Sep 23 – Oct 22 | Air | Cardinal | Venus |
| Scorpio | Oct 23 – Nov 21 | Water | Fixed | Pluto |
| Sagittarius | Nov 22 – Dec 21 | Fire | Mutable | Jupiter |
| Capricorn | Dec 22 – Jan 19 | Earth | Cardinal | Saturn |
| Aquarius | Jan 20 – Feb 18 | Air | Fixed | Uranus |
| Pisces | Feb 19 – Mar 20 | Water | Mutable | Neptune |
How We Calculate This
This birth chart calculator uses established formulas and industry-standard data to provide accurate estimates.
- Enter your specific values into the calculator fields above
- Our algorithm applies the relevant formulas using your inputs
- Results are calculated instantly in your browser — nothing is sent to a server
- Review the detailed breakdown to understand how each factor affects your result
These calculations are estimates based on standard formulas. For critical decisions, always consult a qualified professional.
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This simplified birth chart calculator determines your key astrological placements from your date and optional time of birth. It provides your Western Sun sign, approximate Moon sign, and Chinese zodiac.
The basic rule:
- Your Sun sign is determined by your birth date and represents your core identity
- Your Moon sign is approximated from the lunar cycle on your birth date and represents emotions
- Your Rising sign (if birth time is provided) is estimated and represents how others see you
Note: Moon and Rising sign calculations are approximations. A full natal chart requires precise birth time, location, and an astronomical ephemeris for exact placements.
When Would You Use This Calculator?
This birth chart calculator is designed for anyone who needs quick, reliable estimates without complex spreadsheets or professional consultations.
- When you need a quick estimate before committing to a purchase or project
- When comparing different options or scenarios side by side
- When planning a budget and need to understand potential costs
- When you want to verify a quote or estimate you've received from a professional
- When teaching or learning about the concepts behind these calculations
Frequently Asked Questions
What is a birth chart?
A birth chart (or natal chart) is a map of where all the planets were at the exact moment you were born. It includes your Sun sign, Moon sign, Rising sign, and the positions of all planets in the zodiac. This calculator provides a simplified version with the three most important placements.
What is the difference between Sun sign and Moon sign?
Your Sun sign represents your core identity, ego, and life purpose — it is determined by your birth date. Your Moon sign represents your emotional nature, instincts, and inner world — it is determined by the moon's position at birth and changes signs every 2-3 days.
Why do I need my birth time for a Rising sign?
The Rising sign (Ascendant) changes approximately every two hours as the zodiac rotates through the sky. Without an accurate birth time, it is impossible to determine your Rising sign precisely. This calculator provides an approximation if birth time is given.
How accurate is the Moon sign calculation?
The Moon sign calculation here is an approximation based on the lunar cycle. The Moon changes zodiac signs every 2-3 days, so without precise birth time and location, there can be overlap between signs. For exact Moon sign placement, use a full ephemeris-based calculator.
What is my Chinese zodiac animal?
The Chinese zodiac assigns one of 12 animals to each year in a repeating cycle: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig. Your animal is determined by your birth year. Note that the Chinese New Year falls in January/February, so early-year births may fall under the previous year's animal.
What are zodiac elements and modalities?
Each zodiac sign belongs to one of four elements (Fire, Earth, Air, Water) and one of three modalities (Cardinal, Fixed, Mutable). Elements describe temperament and energy style, while modalities describe how you approach action and change.