Why your birth date matters more than your birth year
The Chinese zodiac, often called the Asian zodiac in the US, does not start its year on January 1. Each animal year begins on Lunar New Year, a date that moves around on the Western calendar and always falls somewhere between late January and the middle of February.
That shifting start is the reason so many quick charts get people wrong. If you were born in January or early February, your birth may come before that year's Lunar New Year, and in that case you belong to the previous year's animal. Someone born on January 15 of a Dragon year, for example, is a Rabbit, because Lunar New Year never comes that early.
This calculator checks your exact birth date against the exact Lunar New Year date of that year, so the edge cases come out right instead of being guessed from the year number alone.
How we find the Lunar New Year date
We do not copy dates from a printed list. The site works out Lunar New Year with astronomy: it finds the December solstice, then the second new moon after it, and reads the calendar date of that new moon in China time, which is how the Chinese calendar fixes the first day of the year.
The moments of the solstice and the new moons come from Astronomy Engine, the same open-source library behind our other tools. The rule above gives the correct date in nearly every year; in the rare years with an unusual leap month, the traditional calendar has its own refinements, which is worth keeping in mind for a birth right on the boundary.
One more detail: some Chinese astrologers, especially in the Four Pillars method, start the animal year at the solar term called the Start of Spring, close to February 4, instead of at Lunar New Year. Both customs exist. Our calculator follows the Lunar New Year boundary, which is the one most people use for their animal sign.
Twelve animals, five elements, one 60-year cycle
The twelve animals repeat in a fixed order: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog and Pig. That gives a 12-year cycle, so you share your animal with people born 12, 24 or 36 years before or after you.
Running alongside it is a 10-year cycle of elements. Each of the five elements, Wood, Fire, Earth, Metal and Water, lasts two years in a row, once in its yang form and once in its yin form. Read more on our Chinese zodiac elements page.
Because 12 and 10 only line up again after 60 years, each animal and element pairing, such as Fire Horse or Water Rabbit, returns once every 60 years. In Chinese tradition that full cycle is a meaningful span, and a 60th birthday is often marked as a special one.
Your hour animal
In Chinese timekeeping, the day is split into twelve two-hour periods, and each one belongs to an animal in the same order as the years. The Rat hour runs from 11 pm to 1 am, the Ox hour from 1 am to 3 am, and so on around the clock until the Pig hour, from 9 pm to 11 pm.
If you enter a birth time, we show the animal for that two-hour slot, based on the clock time you give. Traditional practitioners sometimes adjust the clock to local solar time first, so a birth a few minutes from a boundary can be read differently by different schools.
Astrologers often describe the year animal as how others see you and the hour animal as a more private side. Without a birth time we simply leave the hour animal out; the year animal, element and yin or yang do not need it.
Where to go next
Once you know your animal, open its page from the list, such as the Year of the Dragon, for its traditional character and element versions. To compare two animals, try the Chinese zodiac compatibility tool.
If you are curious how your Chinese sign sits next to your Western one, our sun sign calculator uses the same birth date. The two systems come from different traditions and measure different things, so many people enjoy reading them side by side.