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Zodiac Calculator

Updated Aug 31, 2026 By Jehan Wadia
Rate Formulas

Western Zodiac (Sun Sign)

Used to correctly resolve cusp boundary dates.

Your Sign's Compatibility With Every Sign

Introduction

Want to know your zodiac sign? This free zodiac calculator gives you the answer. Just enter your birthday and get your Western sun sign, Chinese zodiac animal, or check how well two signs match. You will learn your sign's element, lucky numbers, key traits, strengths, and more.

There are 12 signs in Western astrology, from Aries to Pisces. Each sign is tied to a set of dates, an element like Fire or Water, and a ruling planet. The Chinese zodiac also has 12 signs, but they follow a yearly cycle based on the lunar calendar. Each year belongs to an animal like the Dragon, Rat, or Tiger.

Use the tabs above to explore all four tools. The Western Zodiac tab finds your sun sign based on your birth month and day. The Chinese Zodiac tab reveals your animal sign based on your birth year. The Compatibility tab scores how well any two signs work together in love, friendship, and communication. The Sign Reference tab lists all 12 Western signs with their dates, symbols, and elements in one quick table.

How to Use Our Zodiac Calculator

Enter your birth date to find your Western zodiac sign or Chinese zodiac animal. You will get your sign, key traits, lucky colors, compatible signs, and more.

Western Zodiac Tab

Birth Month: Pick the month you were born from the dropdown menu.

Birth Day: Pick the day of the month you were born.

Birth Year: Type the year you were born. This helps check if your birthday falls on a cusp between two signs.

Click "Calculate My Zodiac Sign" to see your sun sign, personality traits, strengths, weaknesses, lucky numbers, and a compatibility chart with all 12 signs.

Chinese Zodiac Tab

Birth Year: Type the year you were born to find your Chinese zodiac animal.

Before Chinese New Year Checkbox: Check this box if you were born before Chinese New Year in your birth year. Chinese New Year falls between late January and mid-February, so this ensures you get the correct animal.

Click "Reveal My Chinese Zodiac" to see your animal sign, element, personality traits, and compatible animals.

Compatibility Tab

Person 1 Sign: Choose the first person's Western zodiac sign from the dropdown.

Person 2 Sign: Choose the second person's Western zodiac sign from the dropdown.

Click "Check Compatibility" to see an overall match score plus breakdowns for emotional, communication, romantic, and friendship compatibility.

Sign Reference Tab

This tab shows a quick-reference table of all 12 Western zodiac signs with their date ranges, symbols, elements, and modalities. No input is needed.

What Is a Zodiac Sign?

A zodiac sign is based on the position of the sun on the day you were born. There are 12 zodiac signs in Western astrology, and each one covers a range of dates throughout the year. Your sign is linked to one of four elements (Fire, Earth, Air, or Water), which shapes the core traits tied to your personality. For example, Fire signs like Aries and Leo are known for boldness, while Water signs like Cancer and Pisces are known for deep emotion. Your sun sign is just one piece of the puzzle: a complete birth chart maps the positions of all the planets at the time of your birth.

Western Zodiac vs. Chinese Zodiac

The Western zodiac uses your birth month and day to find your sign. The Chinese zodiac works differently. It follows a 12-year cycle, and each year is tied to an animal like the Rat, Dragon, or Tiger. Your Chinese zodiac animal is based on the year you were born. Because Chinese New Year falls on a different date each year (usually between late January and mid-February), people born in January or early February may belong to the previous year's animal.

What Is Zodiac Compatibility?

Zodiac compatibility looks at how well two signs get along. Signs that share the same element often connect easily. Signs with opposite elements may need more effort to understand each other. Compatibility scores can cover areas like emotions, communication, romance, and friendship. These scores are based on how the elements, modalities, and positions of the two signs interact with each other on the zodiac wheel.

What Is a Cusp Sign?

A cusp sign happens when your birthday falls within a day or two of a sign change. This means you may show traits from both signs. For example, someone born on November 21 sits near the Scorpio-Sagittarius boundary and could feel a mix of both signs. Traditional astrology assigns only one sun sign per date, but many people find cusp descriptions match them well.

Formulas used

Base Compatibility Score
B_{\text{base}} = \operatorname{clamp}\!\left(B(e_1,e_2) + M(m_1,m_2) + 4 \cdot \mathbf{1}_{\text{opposite}},\; 35,\; 97\right)
Overall Compatibility Score
C_{\text{overall}} = \operatorname{clamp}\!\left(\frac{S_{\text{emo}} + S_{\text{comm}} + S_{\text{rom}} + S_{\text{friend}}}{4},\; 30,\; 99\right)
Clamp Function
\operatorname{clamp}(v,\, lo,\, hi) = \max\!\bigl(lo,\; \min(hi,\; \lfloor v + 0.5 \rfloor)\bigr)
Chinese Zodiac Animal Index
i = \bigl((y - 1900) \bmod 12 + 12\bigr) \bmod 12
Chinese Year Element
d = y \bmod 10, \quad E = \begin{cases} \text{Metal} & d \in \{0,1\} \\ \text{Water} & d \in \{2,3\} \\ \text{Wood} & d \in \{4,5\} \\ \text{Fire} & d \in \{6,7\} \\ \text{Earth} & d \in \{8,9\} \end{cases}
Cusp Detection (days from boundary)
\Delta = \left\lfloor \frac{d_{\text{birth}} - d_{\text{boundary}}}{86400000} + 0.5 \right\rfloor, \quad \text{cusp if } |\Delta| \le 2

Frequently asked questions

What zodiac sign am I?

Enter your birth month and day in the Western Zodiac tab and click Calculate My Zodiac Sign. The tool will show your sun sign, its symbol, element, and key traits right away.

What does it mean if I am on a cusp?

A cusp means your birthday is within two days of where one sign ends and another begins. You may feel traits from both signs. The calculator will show a cusp alert if this applies to you.

Can I check compatibility between the same sign?

Yes. Pick the same sign for both Person 1 and Person 2 in the Compatibility tab. The tool will score how well two people of the same sign match in areas like romance, friendship, and communication.

What are the four elements in Western astrology?

The four elements are Fire (Aries, Leo, Sagittarius), Earth (Taurus, Virgo, Capricorn), Air (Gemini, Libra, Aquarius), and Water (Cancer, Scorpio, Pisces). Each element shapes the core personality traits of its signs.

What is a modality in astrology?

A modality describes how a sign approaches action. Cardinal signs start things, Fixed signs stay the course, and Mutable signs adapt to change. Each sign belongs to one of these three modalities.

Why do I need to check a box for Chinese New Year?

Chinese New Year falls on a different date each year, usually between late January and mid-February. If you were born before that date in your birth year, your Chinese zodiac animal is actually from the previous year. The checkbox fixes this.

What is the difference between a sun sign and a moon sign?

Your sun sign is based on the date you were born and shows your core personality. Your moon sign is based on where the moon was at the time of your birth and reflects your emotions and inner self. This calculator finds your sun sign.

Can two incompatible signs still have a good relationship?

Yes. A lower compatibility score means the two signs may need more effort and patience, but it does not mean the relationship will fail. Many happy couples have signs that are not a natural match.

How many zodiac signs are there?

There are 12 signs in Western astrology (Aries through Pisces) and 12 animal signs in the Chinese zodiac (Rat through Pig). Both systems cover every person based on their birth date.

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