Free calculator

Synastry Calculator

Synastry lays two birth charts over each other and reads the aspects between them—where your planets spark, soothe, or grind against someone else’s.

Free to useReal astronomical dataBuilt for mobile

1First person

2Second person

Birth date

Birth timeI don't know my birth time

Birth place

Curious about a pairing in general? Browse zodiac compatibility for every sign pair.