Why the whole chart beats your Sun sign
Sun signs change once a month, so they split the world into twelve groups. Your birth chart is much more specific: the Moon moves through a sign in about two and a half days, the Ascendant in about two hours. Two people who are both “a Scorpio and a Gemini” can have charts that barely touch, or charts with a Moon sitting exactly on a Venus. That exact contact is what people notice in real life.
What the five areas mean
Emotional is built mostly from Moon contacts, with the Sun and Venus: how safe and understood each of you feels. Attraction comes from Venus, Mars and the Ascendant, what draws you together and how desire is expressed. Communication follows Mercury, with the Sun and Jupiter: whether conversations land or loop. Staying power follows Saturn’s contacts to the Sun and Moon, the sense that this is serious and built to last. Ease is the balance of flowing against tense aspects across the whole chart.
The headline score is a weighted average of the five, with emotional and staying power counting a little more. The bars show where it comes from, so a 60 driven by a strong attraction score and a weak communication score reads very differently from a flat 60 everywhere.
Getting an accurate result
Use the time on the birth certificate if you have it; a remembered “around dinner time” is still better than nothing. Pick the city you were born in, not where you grew up, because the Ascendant and houses depend on the exact place. If one of you has no birth time, the calculator still runs at noon and tells you which parts it had to skip.
From score to reading
The free result shows the score, the three strongest aspects and every line on the wheel. The full reading, if you want it, is written for your two charts specifically: each major aspect in context, where each of you lands in the other’s houses, and the transits that touch the relationship over the next twelve months.
Questions people ask
How is birth chart compatibility different from zodiac sign compatibility?
Zodiac sign compatibility compares one placement each, your Sun signs, so every Leo gets the same answer about every Pisces. Birth chart compatibility compares all ten planets and the Ascendant at their exact degrees, which is why two couples with the same signs can get very different results.
What does the compatibility score measure?
Every aspect between the two charts adds or subtracts according to its type, how tight it is and how personal the planets are. The five bars group them: emotional (Moon, Sun, Venus), attraction (Venus, Mars, Ascendant), communication (Mercury, Sun, Jupiter), staying power (Saturn with the Sun and Moon) and ease, which counts every aspect. A middling score with strong individual lines is common and often describes a lively relationship.
Can a low score mean we are not compatible?
It means the charts have more friction than flow. Plenty of long relationships have exactly that, and astrology was never meant to replace knowing the person. Read the score as a description of the dynamic, not a pass or fail.
Does it work for friends and family?
Yes. Pick Friendship at the top. The chart math is identical; what changes is how the reading frames attraction and commitment.