Free tool
Compatibility calculator
Real birth-chart compatibility, not just sun signs. Enter both birth dates, times and places, and we compute two complete charts and read the aspects between them: moon, Venus, Mars and rising.
Person one
Person two
Both people need a birth date, time, and place.
Want the whole picture? Get your complete birth-chart reading in plain language, and see what to actually do with it. Free.
How it works
Two real charts, the aspects between them
We compute each person’s full birth chart from a precision ephemeris, then find every close aspect between the two: where one person’s Venus meets the other’s Mars, where the moons align or clash, where Saturn steadies or weighs. Those contacts are the real mechanics of attraction, comfort, friction, and staying power.
The planet positions and rising signs are exact, validated against reference charts to the degree. The aspects are factual geometry. The scores and the reading we build on top are an honest interpretation, the same craft an astrologer brings, not a measured certainty.
FAQ
What does this compatibility calculator do?
It computes both people’s complete birth charts and reads the actual aspects, the angles, between them: moon to moon, Venus to Mars, and more. That goes far beyond sun signs, so it accounts for how each of you feels (moon), loves (Venus), connects (Mars), and comes across (rising). This branch of astrology is called synastry, and it is where real compatibility lives.
Why do you need birth time and place?
The moon moves about a degree every two hours and the rising sign changes every couple of minutes, so both depend on the exact time and location of birth. Without them a calculator can only read sun signs. The place sets the coordinates and the correct historical timezone, which matters for getting each chart right.
How accurate is the chart?
The astronomy is exact. Planet positions come from a precision ephemeris validated against NASA JPL data, and the rising sign is computed from real sidereal time and your coordinates, tested against known reference charts down to the degree. The aspects it finds between your charts are factual; the scoring and interpretation on top are an honest reading, not a hard science.
Is my birth data stored or shared?
No. Your birth details are used to compute the charts and are not saved. The shareable card shows only the scores and first names, never anyone’s birth time or place, so sharing it never exposes private data.
Prefer to browse? See all compatibility pairings or work out your life path number.
Want to know what to do with it?
A compatibility chart shows the wiring. A full reading walks you through how to actually navigate it together.
Get your free reading