Rat and Dragon compatibility
Combination
The Rat is the branch 子, Yang Water. The Dragon is 辰, Yang Earth. Here is how the two branches meet in the tables Korean saju uses, and how their elements relate.
By the tables, the Rat and the Dragon have a combination and no friction marks. This is usually called an easy pairing.
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Branches: 子 and 辰
Half trine (半合)
子 and 辰 are two of the 申子辰 Water team of three, including its middle sign, so the tables count them as a half set. It is read as a shared direction: things started together tend to grow.
Elements: Water and Earth
Earth controls Water in the controlling cycle. The Dragon side tends to set the frame and the Rat side tends to feel it. Read gently it is structure, read harshly it is pressure. Agreeing who decides what usually helps.
Both branches are Yang.
Groups you share
The Rat and the Dragon belong to the same three-sign team, 申子辰 (Water). The Monkey is the third member, so these three signs together make the classic full set.
How to read this
A zodiac sign is one character out of eight in a saju chart. For two people, the birth-day pairs, the balance of elements and timing usually say more than the signs do. Treat this page as a tendency, for fun and self-reflection, not a verdict on anyone.

A sign is just one character
Two full charts have sixteen. Enter your birthday, then theirs, and the Moon Rabbit works out your compatibility score for free, on your device.
Questions
Are the Rat and the Dragon compatible?
By the tables, the Rat and the Dragon have a combination and no friction marks. This is usually called an easy pairing. It is one character each, so treat it as a tendency. The full charts of both people say more.
Which signs are traditionally closest to the Rat and the Dragon?
By the tables, the Rat’s closest partner (six harmony) is the Ox and its three-sign teammates are the Monkey and Dragon. For the Dragon, the closest partner is the Rooster and the teammates are the Monkey and Rat.
Is zodiac compatibility the same as saju compatibility?
No. Zodiac compatibility compares only the two birth-year signs. Saju compatibility compares both full charts, especially the birth-day pairs and how the elements fill each other in. SajuBunny shows that score for free.