What is astrological love compatibility?
Astrological compatibility compares two birth charts and reads the angles between them as a description of how the two people interact. It is the same technique as synastry; the difference here is that the result is condensed into a single score with the reasoning shown. Rather than the usual "Leo and Aquarius are opposites" - which compares two Sun signs and ignores the other nine placements in each chart - this uses the real positions of the Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn and the ascendant in both charts.
As a love compatibility calculator by birthdate, it works from two dates alone. Enter 14 February 1991 for the first person and 30 August 1989 for the second, with no times, and the score is 47%: five supportive contacts, five frictional ones, and the band that reads more friction than support. The contact that moved the number most is the first person's Sun opposite the second person's Moon. A zodiac sign love compatibility calculator would compare Aquarius with Virgo and stop; this compares seven placements in each chart, eight once a birth time and place add the ascendant.
The score is a scheme, not a measurement, and this tool says so on the result rather than in the small print. Synastry is a traditional technique with a large literature and no agreed arithmetic; reducing it to a percentage is a modern convention that no historical source supports. What can be done honestly is to state the scheme: which pairings count, what each is worth, how exactness is factored in, and what happens to friction. The result prints a caveat saying so, lists every supportive and frictional contact with its orb, and shows the six contacts that moved the score most with what each contributed, so you can judge the number instead of taking it on trust.
Two choices in that scheme are worth knowing about. Contacts are scaled by exactness, so a Sun-Moon trine within a degree counts for far more than the same aspect six degrees out - that is the one part of the weighting every tradition agrees on. And friction is discounted rather than subtracted in full, because a relationship with no squares at all is not the ideal the score should point at. The literature is consistent that some friction is what gives a pairing energy, and a scoring scheme that punished it would rank inert relationships highest.
How to check astrological compatibility?
Enter both birth dates
The date alone gives a usable comparison of the planets. Add times and places and the ascendant joins in, which is one of the contacts the tradition weighs most.
Read the score with its description
The percentage is never shown bare - the line under it says what that band means, and the caveat under that says what the number is and is not.
Look at what helps and what does not
Supportive and frictional contacts are listed separately, each with the orb it was found at, so the score can be traced back to specific placements.
Check what moved the number
The six strongest contacts are listed with the score each contributed. If you disagree with a weighting, you can see exactly what it did.
Key Features
Real Positions, Not Sun Signs
Compares eight placements in each chart from computed positions, rather than pairing two Sun signs and ignoring the rest
The Weighting Is Shown
The six contacts that moved the score most are listed with what each added or took away, so the number can be argued with instead of believed
Scaled by Exactness
A contact within a degree counts far more than the same aspect at six - the one weighting every tradition agrees on
Friction Counted Honestly
Hard aspects are discounted rather than subtracted in full, because a frictionless comparison describes an inert relationship, not an ideal one
Frequently Asked Questions
Related Tools
Chiron Sign Calculator
Find your Chiron sign - the "wounded healer" - from your birth date, computed from a JPL Horizons ephemeris rather than an approximate date table
Dating & Personal Growth Calendar
A transit calendar for the months ahead: which days carry supportive contacts to your birth chart, which carry friction, and which are quiet
Synastry Chart Calculator
Compare two birth charts and see every aspect between them, in both directions, with the orb each was found at
Venus Sign Calculator
Find your Venus sign from your birth date - how you love, what you find beautiful, and what you value in a partner - computed from Venus's real position
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