Compatibility Between Couples Based on Dates of Birth

Updated February 21, 2017

Compatibility between couples is a widely varied subject and has many different aspects to it. There are theories and hypotheses about compatibility based on a wide range of factors, including birthdays. Birthday compatibility is a study of whether a couple might get along based on their date of birth.

Astrological Zodiac

There are 12 signs in the zodiac, which are based on the 12 months of the year. Some birthday compatibility relates to the zodiac sign when a birthday takes place. The 12 signs of the zodiac are Ares, Libra, Taurus, Scorpio, Gemini, Sagittarius, Cancer, Capricorn, Leo, Aquarius, Virgo and Pisces. The 12 signs are often associated with specific personality traits, such as Libra's balance or Capricorn's drive to success, and the traits combined with the signs determine compatibility.

Chinese Zodiac Signs

The Chinese zodiac is related to the years of birth and the signs associated with the years. The Chinese zodiac goes in a cycle of 12 years and has 12 signs. The Chinese signs are the year of the rat, ox, tiger, rabbit, dragon, snake, horse, goat, monkey, rooster, dog and pig. Each year is associated with different personality traits, such as a tiger's stubborn and competitive nature or the rat's wit and charm. The animals on the Chinese zodiac have compatibility charts determining what signs are most compatible and which ones are the most rocky.

Birthday Numerology Compatibility

Numerology is the study of numbers in the birthday. The primary number is found by using the day of the birthday. For example, May 3 has the number 3 as the primary number. For double digit numbers, add the numbers together. For May 13, for example, you would add 1 + 3 to get a total of 4. For compatibility, both numbers are considered and then a chart is used to determine the compatibility. There are numerous calculators available online for easier calculation.

Reading the Charts

Regardless of the type of birthday compatibility, there are charts available. The charts are usually numbered from either one to 10 or negative 10 to positive 10, depending on the type of compatibility option. Numerology usually uses the number 21, while the zodiac versions use a one to 10 chart. The lower the number, the less the compatibility. For example, a couple with a compatibility number of negative nine has very low compatibility, while a couple with positive nine has high compatibility. Most couples fall somewhere in the middle. Some charts go by two numbers instead of one, such as numerology. For example, the numbers may be 1 and 5 for the couple, so the chart gives information about the specific combination.

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About the Author

Helen Jain has been writing online articles since December 2009 for various websites. She has studied English and psychology and hopes to get a Ph.D. in English in the future.