Chinese Zodiac Compatibility Explained: Harmonies, Clashes and What They Really Mean

Chinese zodiac compatibility is a traditional way of describing how the twelve animal signs relate to one another. It rests on the twelve earthly branches, the older system that the animal names were later attached to, and on patterns that almanacs recorded over many centuries. This guide explains the main patterns, shows how the year boundary decides which sign a person belongs to, and says plainly what modern research does and does not support.

What Chinese zodiac compatibility is built on

The Smith College Museum of Art explains that the twelve zodiac animals are known as the twelve earthly branches (dizhi). Those branches work alongside ten heavenly stems to name days, months and years. The Wikipedia article on Earthly Branches gives more background on how the branches are used in the wider calendar system.

The calendar behind all of this is lunisolar. Encyclopaedia Britannica describes it as following the moon, with twelve months of 29 or 30 days, and with intercalary months added so the seasons stay roughly in step. Stems and branches combine into a 60-year cycle, which is why the same animal returns every twelve years in a slightly different combination.

The harmony patterns

Traditional almanacs describe two kinds of harmony. The first is the Six Harmonies (六合), pairs that are said to combine well and are sometimes called "secret friends." The second is the Three Harmonies (三合), a group of three signs spaced four years apart that are said to share an outlook.

These are descriptions of a tradition, not measurements of how people actually get along. Think of them as a vocabulary for talking about a relationship, not a verdict on it.

The friction patterns

The older texts also list signs that oppose or rub against each other. The most familiar is the clash (冲), which links signs six positions apart, directly opposite on the twelve-branch wheel. Other friction tags are harm (害), break (破) and punishment (刑).

Some pairs carry both a harmony tag and a friction tag. Tiger and Pig, for example, form a Six Harmony pair and also a Break pair. Real relationships are often mixed in the same way, so this site shows every Chinese zodiac compatibility tag rather than picking one label.

Chinese zodiac compatibility and the year boundary

Before reading any pair, you need the correct sign. The zodiac year begins at Chinese New Year, not on 1 January. Encyclopaedia Britannica notes that the zodiac year begins with Chinese New Year, which falls on a new moon between 21 January and 20 February. Someone born in early February may therefore belong to the previous animal.

The Hong Kong Observatory publishes the boundary dates used here, in its Gregorian-Lunar Calendar Conversion Table. Using those boundaries gives these worked examples:

Once the sign is right, the chart can be read. A person born on 2026-02-16 is a Snake, so the Snake pairings apply: Snake and Monkey are a Six Harmony pair, while Snake and Pig are a clash. A person born the next day is a Horse, and the Horse pairings change completely.

What research says about zodiac beliefs

Several studies have tested whether the zodiac affects real outcomes, and their results are mixed. Yip, Lee and Cheung (2002) examined births in Hong Kong and found that births in Dragon years in 1988 and 2000 rose by 7.8% and 4.2% over the preceding year. Their reading was that the effect was mainly about timing, with little effect on cumulative fertility. You can read the abstract on Elsevier's ScienceDirect page.

Other work points the same way from different angles. Goodkind (1993) studied Taiwan in 1976 and found that notable Dragon-year fertility increases did not appear before that year. The 1976 boom was mostly linked to marriage timing and other behaviour rather than to the animal itself; see the Demography article.

Mocan and Yu, in an NBER working paper, report that births jump in Dragon years and that Dragon-born children were more likely to be college educated and to have higher entrance exam scores. However, the effect disappeared once the authors accounted for parents' expectations, which suggests a self-fulfilling pattern rather than a direct effect of the sign. Ma Yan (2010), in Population Research, found no national zodiac birth preference in mainland China from 1949 to 2008, and attributed the year-to-year fluctuations to population momentum.

None of these studies tests whether two signs make a good match. They are useful mainly as a reminder that beliefs can shape behaviour, and that large patterns are not the same as personal fate.

Why there are no percentages

You will find websites that rate couples with numbers such as a precise percentage score. Those figures are invented. The tradition describes patterns of harmony and friction; it never produced probabilities. This site shows the actual relationships, what each one traditionally means, and practical ways to think about romance, friendship and work.

It also helps to know where the personality descriptions come from. The Victoria and Albert Museum notes that the stem-and-branch reckoning and its 60-year cycle were in use for a long time before 1912, but that describing personality by sign is a fairly recent development that does not appear in old Chinese texts. Personality traits linked to the animals are cultural tradition, not science, and they are best read as storytelling rather than measurement.

Same sign, perfect match?

In Chinese zodiac compatibility, a shared sign is not automatically a perfect match. Two people of the same sign share some rhythms, but they can also share blind spots. Folk tradition notes a self-punishment pattern for Dragon, Horse, Rooster and Pig, which is one reason same-sign pairs are not always treated as an easy fit. Judge the actual people, their values and their habits, before reaching for any chart.

How to check

Start by confirming the sign using the boundary dates above, especially if the birthday falls in January or February. Then open the Chinese zodiac compatibility tool to compare any two signs, or scan the full 12 by 12 chart on the same page. If you are not sure of someone's sign, you can enter their birthday there. It is checked in your browser and never stored. For more on the calendar and the sign list, visit the homepage.

Frequently asked questions

What is Chinese zodiac compatibility?

Chinese zodiac compatibility is a traditional system for describing how the twelve animal signs relate to each other. It uses the twelve earthly branches and patterns such as Six Harmonies, Three Harmonies, clashes, harms, breaks and punishments. These are cultural descriptions of relationships. They do not measure how well two people will actually get along.

Does Chinese zodiac compatibility give a percentage score?

No. The tradition describes patterns, not probabilities, so any site that shows a precise percentage for a couple is making up that number. This guide and the Chinese zodiac compatibility tool show the actual pairings and what each one traditionally means.

When does a new zodiac year start for Chinese zodiac compatibility?

The zodiac year begins at Chinese New Year, which falls on a new moon between 21 January and 20 February, not on 1 January. A birthday in early February may belong to the previous animal. Check the exact boundary date for the year before using any pairing.

Is there research on zodiac effects linked to Chinese zodiac compatibility?

Some studies test zodiac effects on births and outcomes, but none tests whether two signs make a good match. Yip, Lee and Cheung (2002) found Hong Kong Dragon-year births rose 7.8% and 4.2% over the preceding year, mainly a timing effect. Ma Yan (2010) found no national zodiac birth preference in mainland China from 1949 to 2008.

Are two people of the same sign a perfect Chinese zodiac compatibility match?

Not automatically. Same-sign pairs share some rhythms, but they can also share blind spots. Folk tradition notes self-punishment for Dragon, Horse, Rooster and Pig. Chinese zodiac compatibility is best used as a conversation starter rather than a fixed rule about two people.

How can I check my sign before reading Chinese zodiac compatibility?

Compare your birthday with the boundary dates for your year, which change at Chinese New Year. The Hong Kong Observatory publishes the conversion table used for these dates. You can also enter a birthday in the Chinese zodiac compatibility tool on this site, where it is checked in your browser and never stored.

Sources

• Yip, Lee & Cheung (2002), The influence of the Chinese zodiac on fertility in Hong Kong SAR, Social Science & Medicine — Elsevier
• Chinese New Year — Encyclopaedia Britannica
• Chinese calendar — Encyclopaedia Britannica
• Gregorian-Lunar Calendar Conversion Table — Hong Kong Observatory
• Mocan & Yu, Can Superstition Create a Self-Fulfilling Prophecy? School Outcomes of Dragon Children of China (NBER w23709) — NBER
• Ma Yan (2010), Having an Auspicious Baby in an Auspicious Year? Zodiac Preference in China 1949-2008, Population Research 34(5) — Population Research (Renmin University)
• Lunar Year and the Art of Chinese Cosmology — Smith College Museum of Art
• Goodkind (1993), New zodiacal influences on Chinese family formation: Taiwan, 1976, Demography 30 — Springer
• The 12 zodiac animals at the V&A — Victoria and Albert Museum
• Earthly Branches — Wikipedia