Ultimately, Capricorns typically are most compatible with Taurus, Virgo, Scorpio, and Pisces (via Compatible Astrology). The water signs tend to balance the earth in Capricorns, while their earth gives grounding to the water. That doesn't mean, though, that you could never find happiness with a person who isn't your ideal compatible sign. It just means you'll have to work harder to overcome some of the incompatibility issues. "Comparing sun signs can give a good general idea of compatibility. However, this is just a quick and easy way to compare, and it's going to have lots of exceptions on this broad level," explained Compatible Astrology. 

Capricorns vibe well with partners who are committed, reliable, hardworking, passionate, ambitious, rational, encouraging, organized, and responsible, as these are the traits they often have in themselves. They love feeling understood by their significant others, which those under their most compatible zodiac signs find easy to do.