Compatibility

Ashta Kuta is a way of matching two birth charts across eight factors and reducing the result to a single number. Each factor is called a kuta, there are eight kutas in all, and together they yield thirty-six gunas — units of agreement. What is matched is not the whole chart but the position of each person's Moon: its sign and its nakshatra. The same reckoning also goes by the name Kundali Milan.

Where the number comes from

Each kuta carries its own weight. Varna is one point, Vashya two, Tara three, Yoni four, Graha Maitri five, Gana six, Bhakoot seven, Nadi eight. The weights rise in order, and the eight together come to thirty-six.

That ladder means something simple: one kuta is not equal to another. Losing a point on Varna and losing eight on Nadi are different events, though both reduce the total. To read the sum without looking at what it is made of is to lose the very thing the reckoning was for.

Four kutas look at the nakshatra — Tara, Yoni, Gana and Nadi. Four take the sign of the Moon: Varna, Vashya, Graha Maitri and Bhakoot.

The Lagna does not enter this reckoning at all, so the birth time is needed here not for the houses but only for the Moon's position. The Moon crosses a nakshatra in roughly a day and a sign in a little over two, so when the hour is unknown the reckoning is made for noon, and near the edge of a nakshatra or a sign the score may come out differently.

The eight kutas

Varna Kuta — one point. The varna layer by the sign of the Moon; the score depends on whose layer stands higher, which makes the kuta directional.

Vashya Kuta — two points. The signs are sorted into groups, and the kuta speaks of the pull between them.

Tara Kuta — three points. The partners' nakshatras are counted from one another, and the remainder of the division by nine decides the outcome.

Yoni Kuta — four points. Twenty-seven nakshatras are reduced to fourteen animals; some of the pairings are named hostile.

Graha Maitri Kuta — five points. The friendship of the lords of the Moon signs: how those two planets get along is the measure.

Gana Kuta — six points. Three classes of nakshatras — divine, human and demonic. In the commentarial line this reckoning follows, swapping the groom and the bride changes the score.

Bhakoot Kuta — seven points. The distance between the Moon signs: three axes zero the kuta outright.

Nadi Kuta — eight points. The heaviest, and tradition names it the chief of the eight.

Standing apart from the total is Mangala Dosha — the position of Mars relative to the chart's reference points. It does not enter the thirty-six gunas and is reckoned separately.

The doshas are read before the sum

Nadi and Bhakoot are called blocking: when they fall to zero, the remainder is not added up and a high total is no cause for cheer. This reckoning flags a zeroed Gana the same way. A total of twenty-eight with a zeroed Nadi and a total of twenty-two with Nadi intact are not the same thing, though the first is larger.

Bhakoot has recognised exemptions — conditions under which the dosha is not counted. But the commentarial tradition sets a limit: whichever exemption applies, the Nadi must still agree. One dosha does not cover for another.

What Ashta Kuta is not

Thirty-six gunas are a first-pass filter. In the classics Guna Milan sits inside the muhurta of marriage: it is part of the procedure for choosing a time, not a separate science of human relations. The reckoning answers the question "are there gross mismatches visible at once", and there its task ends.

A full marriage reading works differently. One looks at the seventh house in both charts, at Venus, at the Navamsha, the Upapada and the Darakaraka. Ashta Kuta replaces none of these techniques and contradicts none of them — it answers a different, narrower question.

Ashta Kuta and the southern set of ten porutthams are different systems. The southern tradition counts agreement rather than a sum: ten factors, of which at least five must match. It assigns no points at all. The same couple is assessed differently by the two systems, and that is not a calculation error but two ways of putting the question.

The system does not decide about marriage. It lists the factors and shows where they diverge — the rest is for people to decide.

The school matters

The kuta matrices are not uniform. The make-up of the varna layers, the hostile pairs in Yoni, the cells of Gana, the composition of the Vashya groups, the direction of counting in Tara — on each of these the sources diverge, and the divergence runs not between "right" and "wrong" but between schools and commentarial lines. Sometimes it runs within a single edition: the root verse states the rule symmetrically while the commentary on that same verse states it directionally.

So every Ashta Kuta reckoning has a school, and an honest reckoning names it. The line taken here is the northern one. On the disputed points of composition — the Varna layers, the Yoni hostilities, the direction of Gana — this reckoning follows the Muhurta Chintamani. The numeric gradations of Yoni and Vashya do not agree with the printed table of the commentary in every cell, and for that reason the cell-by-cell values are not given in these articles.

How to read the result

First look at whether any blocking kuta has fallen to zero. Then look at what the sum is made of: eight points in one place and zero in another give the same figure as four and four, but they say different things. Only then look at the sum itself.

Read Mangala Dosha separately: it neither adds to the kutas nor subtracts from them.