Composite Chart Calculator
Merge two birth charts into one relationship chart and meet the astrology of your bond itself. Enter both sets of birth details.
What is a composite chart?
A composite charttakes two people's birth charts and combines them — point by point — into a single chart that represents the relationship as its own living entity. Where synastry compares two charts, the composite mergesthem: the composite Sun is the relationship's core purpose, the composite Moon its emotional heart, and the composite Venus how love and affection flow between you.
It's one of astrology's most powerful tools for understanding the “third entity” that two people create together.
Frequently asked questions
What is a composite chart?
A composite chart is a single chart created from the midpoints of two people's birth charts. Instead of comparing two charts (synastry), it reveals the personality and purpose of the relationship itself as its own entity.
How is a composite chart calculated?
Each composite point is the mathematical midpoint between the two people's corresponding planets — your composite Sun is the midpoint of both Suns, and so on. Our calculator does this automatically from two sets of birth details.
What's the difference between composite and synastry?
Synastry compares two separate charts to see how two people interact. A composite chart merges them into one chart that describes the relationship as a third entity. Many astrologers use both together.
Do I need exact birth times?
For the composite Sun, Moon, Venus and planets, birth dates and places are enough. Exact birth times add the composite Ascendant and Midheaven for a fuller relationship chart.