Zodiac Sign Calculator – Free Sun Sign Finder (Western & Chinese)

What Is a Zodiac Sign Calculator?

A Zodiac Sign Calculator is a free online tool that reveals your astrological identity from the moment you were born. Using your birth date, it instantly works out your Western sun sign — one of the 12 zodiac constellations the Sun occupied when you arrived in the world. Using your birth year, it also finds your Chinese zodiac animal from the traditional 12-year cycle.

Whether you are curious about your horoscope, checking compatibility with a friend, or exploring astrology for the first time, this calculator gives you a complete profile in a single click — free, private, and working entirely in your browser.

How to Use the Zodiac Sign Calculator

Finding your sign takes just three quick steps:

1. Choose a mode. Tap “Western Zodiac” to find your sun sign or “Chinese Zodiac” to find your lunar animal.
2. Enter your birthday. Pick your birth date, or type your birth year for the Chinese zodiac.
3. Reveal your result. Click the button and instantly see your sign, element, ruling planet, lucky color, lucky numbers and best compatibility matches.

Tip: hit the “Today” chip to find the sign for today’s date in one tap — great for quickly checking a friend’s birthday or today’s zodiac date range.

The 12 Zodiac Signs & Their Dates

Each Western sign covers a fixed date range and belongs to one of four classical elements:

How the Zodiac Sign Calculator Works

Western sun sign

The tool reads the month and day of your birth and maps them against the 12 fixed date ranges used by modern Western astrology (the tropical zodiac). If your date falls on a boundary day — such as April 20, when Aries ends and Taurus begins — the calculator correctly assigns the sign whose range includes your exact date.

sign = range(month, day)   // matched against the 12 sign boundaries

Chinese zodiac animal

The Chinese zodiac follows a repeating 12-year cycle. The calculator finds your animal from your birth year using the standard formula, where each year maps to an animal in order: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig.

animal = CHINESE[year mod 12]   // e.g. 2024 → Dragon

The five traditional elements — Wood, Fire, Earth, Metal and Water — are derived from the last digit of your birth year, adding an extra layer of detail to your profile.

Key Features of Our Zodiac Sign Calculator

• Western sun signs — all 12 signs with accurate boundary handling.
• Chinese zodiac — all 12 lunar animals plus the five elements.
• Complete profile — element, modality, ruling planet, lucky color and lucky numbers.
• Compatibility — see your most and least compatible sign matches.
• Instant results — sign revealed the moment you click.
• 100% private — everything runs locally; nothing is uploaded or stored.
• Fully responsive — works on phones, tablets and desktops.

Why People Use a Zodiac Sign Calculator

Curiosity & Self-Discovery

Millions of people look up their sign to learn more about their personality, strengths and tendencies. A quick lookup is the perfect starting point.

Compatibility & Relationships

Wondering whether you and your partner, friend or colleague are astrologically in sync? Check both signs to see the classic compatibility between them.

Gift-Giving & Birthdays

Find a friend’s or family member’s sign from their birthday and pick a lucky-color gift that feels personal and thoughtful.

Festivals & Lunar New Year

Each Lunar New Year ushers in a new animal. Use the Chinese zodiac mode to see which animal rules the coming year — and which one you were born under.

Frequently Asked Questions