More than a sign match
Most compatibility tests compare two Sun signs. This one compares two whole birth charts: the Sun, Moon, Mercury, Venus, Mars and the outer planets at their exact degrees, plus the Ascendant when you know your birth time. That is the same comparison an astrologer draws by hand, called synastry, and it is why two couples with the same signs can get very different results.
What you get
A score out of 100 with the five areas behind it, the three strongest lines between your charts with a plain-English meaning for each, an interactive bi-wheel you can tap line by line, and the full list of aspects and house overlays. Pick Love, Marriage or Friendship at the top to change how it is framed.
Questions people ask
How does the astrology compatibility calculator work?
It casts both birth charts from date, time and place, then measures every angle between one person’s planets and the other’s. Each aspect is weighted by how tight it is and how personal the planets are, and the result is grouped into a 0–100 score and five areas.
Is it free?
The calculator, the chart and the aspect list are free with no account. An optional written reading for your two charts costs $9.99 once.
What if I don’t know my birth time?
Tick “I don’t know”. The chart is cast for noon, so the Sun and planets stay accurate; the Moon may be a few degrees off and the Ascendant and houses are skipped.