Free calculator

Free synastry chart — your two birth charts, crossed at home.

Your birth, theirs — and the bi-wheel appears: your chart inside, theirs outside, read in your houses. The contacts between your planets, from the tightest to the widest, with their exact orb. Nothing is sent: neither your birth, nor theirs.

You Your chart goes inside the wheel: theirs is read in your houses.

This database holds … cities for this country. If yours is missing, give its coordinates and time zone.

The other person Partner, ex, parent, child, friend, business partner: any bond.

This database holds … cities for this country. If theirs is missing, give its coordinates and time zone.

Just your chart? Your birth chart, free

Explore your two chartsTap a planet, a house or a line.

Your chart is inside (gold), theirs outside (blue): both are read in your houses.

The lines of the wheel

  • Conjunction same degree
  • Opposition face to face
  • Square the tension
  • Trine the ease
  • Sextile the opening
  • Dashed a contact on an angle (Ascendant, Midheaven)
  • The angles yours in solid gold, theirs in dashed blue

The hard aspects are warm, the soft ones are cool. By default only the tight contacts (orb under 2°) are drawn — the count of the others is written on the wheel.

Your points

Their points

The contacts between you

    On your angles

      Display

      A tight contact is felt every day; a wide one colors without imposing. Both are in the lists; the wheel first draws only the tight ones, to stay readable.

      What this page does not do

      It does not grade you. No percentage, no compatibility score — and we will not give you one: what two charts do together does not add up, it is read.

      It explains every crossing on a click: what their Venus does to your Sun, what a planet lays on your Ascendant. It stops at one contact at a time, never linking them together — and that weaving is what the reading is.

      And it does not know who you are to each other. A reading crosses everything, both ways.

      The synastry reading — $29.99 USD

      Partner, ex, parent and child, siblings, friendship, work — delivered within 72 h.

      The real questions

      What you can check for yourself.

      Why is there no compatibility score?

      Because it would be false. A synastry gives contacts and their orbs; a percentage would add up things that do not add up — a Venus-Mars conjunction and a Moon-Saturn square do not cancel each other out, they are read together. We give you the exact calculation, and we will not sell you hope in the shape of a number.

      Why is their chart read in my houses?

      That is the convention of the bi-wheel: the chart in the center sets the houses, the outer chart is placed on them. “Their Mars in my seventh house” tells you which area of your life their planet falls in — the very sentence one looks for in synastry. To read it the other way round, simply swap the two blocks: you move outside, and the wheel is re-read in their houses.

      What if one of us does not know the birth time?

      The planets in signs and the contacts between your planets remain exact: they do not depend on the time. What is missing on that side is the Ascendant, the Midheaven and the houses — and the Moon, which moves thirteen degrees in a day: placing it without the time would invent contacts, so it is not placed. If your time is the one missing, the wheel is read in the other person’s houses.

      Is this the same calculation as your synastry reading?

      Yes — the same engine, the same orbs, the same list of contacts, automatically checked against the documents I sell. What changes in the written reading is not the calculation: it is what is done with it. It crosses every contact with both whole charts, both ways, and names what each of you awakens in the other — which this page, not knowing who you are, cannot do.