Guna Milan scores 36 points. Here is what they miss.
Ashta koota matching gives a marriage a number out of 36, and families treat that number as a verdict. It helps to know exactly what the arithmetic looks at, and what it never sees.
What the 36 points are actually counting
Guna Milan, sometimes called ashta koota, means "eight categories." Each category compares one thing between two birth charts and awards points. Add them up and you get a score out of 36.
The eight, with their maximum points, run like this. Varna, worth 1 point, compares a rough temperament class. Vashya, worth 2, looks at which chart is traditionally said to hold more sway. Tara, worth 3, counts the distance between the two birth stars and calls the result lucky or unlucky. Yoni, worth 4, assigns each birth star an animal symbol and asks whether the two animals get along. Graha Maitri, worth 5, checks whether the ruling planets of the two Moon signs are friendly. Gana, worth 6, sorts people into three broad natures: godly, human and restless. Bhakoot, worth 7, measures the distance between the two Moon signs. Nadi, worth 8, sorts each birth star into one of three groups and penalises a match when both fall in the same group.
Those add to 36. In most north Indian practice, 18 or more is treated as workable and below 18 as a warning. Different regions use different cutoffs, and south Indian astrologers often weigh a smaller set of factors instead. So the number is not one fixed standard. It is a tradition with local dialects, and the cutoff you were quoted depends on who quoted it.
Why the score is mostly two nakshatras
Here is the part that rarely gets said out loud. Every one of the eight kootas is a lookup table, and almost all of them are keyed to a single astronomical fact: where the Moon was at birth.
The zodiac is divided into 27 nakshatras, or lunar mansions, each 13 degrees 20 minutes wide. The Moon travels about 13 degrees a day, so it spends roughly one day in each nakshatra and completes the circle in about 27.3 days. A nakshatra is simply a named slice of sky that the Moon was crossing when you were born. The 12 signs are a coarser cut of the same circle, 30 degrees each. Vedic work uses the sidereal zodiac, measured against the stars rather than the equinox, which is why a Vedic Moon sign often differs from a Western one.
Now trace the kootas back. Yoni, Gana, Nadi and Tara all come from the nakshatra. Varna, Vashya, Graha Maitri and Bhakoot all come from the Moon sign, which is just a wider bracket around the same Moon. That is it. Feed in two Moon longitudes and the score falls out.
This has a strange consequence. Your rising sign changes every two hours, and it is not used at all. Your Sun, Mercury, Jupiter and Saturn are not used. Two people born a week apart in different cities can produce the identical Guna Milan score with a third person, because their Moons happened to sit in the same slice of sky.
Two of the eight decide almost half the score
The points are not spread evenly. Bhakoot and Nadi together are worth 15 of 36, and both are all-or-nothing in common practice. Fail Nadi and you lose 8 points in one stroke. Fail Bhakoot and you lose 7.
So a couple who match well on six categories can still land around 21 because of two table lookups. Another couple can score 30 while quietly failing Yoni and Gana, which are the categories that traditional texts link to temperament and physical compatibility. The headline number hides which parts failed, and the parts matter more than the total.
There is a second layer that makes this messier. Both Bhakoot and Nadi have long lists of cancellation rules. If the two Moon signs share the same ruling planet, many astrologers cancel Bhakoot dosha entirely. If both people share the same Moon sign but different nakshatras, some cancel Nadi dosha, and others do not. These exceptions are not agreed on. They come from different regional lineages and different commentaries, and applying them can swing a score by 15 points.
That should make anyone cautious about a firm cutoff at 18. A rule that moves 15 points depending on which teacher you asked is not a precise instrument. Treat the total as a rough summary, and always ask which specific kootas failed and why.
The planets the number never looks at
Vedic astrology has a lot to say about marriage that Guna Milan simply does not consult.
The 7th house, counted from the rising sign, is the traditional house of the spouse and of partnership. Guna Milan never touches it, because it never uses the rising sign. The lord of that house, and any planets sitting in it, are invisible to the score.
Venus, which classical texts tie to affection, attraction and pleasure, is not in the calculation. Neither is Mars, which is linked to drive, heat and conflict. Neither is Saturn, associated with duty, delay and endurance, or Jupiter, which older texts treat as a key marriage indicator for a woman's chart. The Navamsa, the ninth-part chart that many astrologers consider the primary tool for marriage, is not consulted at all. Nor is timing. The dasha system, which maps out which planetary period a person is passing through, decides when a Vedic astrologer thinks a marriage is even ripe. Guna Milan is silent on it.
This is not a secret criticism from outside the tradition. Classical writers presented koota matching as a first filter, one step among several, not as the whole examination. It became the whole examination because it is fast, it is easy to tabulate, and it produces a single number that families can discuss. Convenience won. If you want the wider picture, you need the actual charts, and you can compute your free Kundli to see where those planets really sit.
A 32 out of 36 with a hard Mars is not a 32
Consider two charts that score 32. Both Moons sit in friendly nakshatras, Nadi and Bhakoot both pass, and only a point or two goes missing. On paper this is a strong kundli matching result.
Now look at the rest of one chart. Mars sits in the 7th house from the ascendant, tightly aspected by Saturn, with Venus close to the Sun and weak by position. In traditional terms this is what people mean by Mangal dosha or Kuja dosha: Mars placed in the 1st, 2nd, 4th, 7th, 8th or 12th house, read as heat and friction brought into partnership. The Guna Milan score cannot see any of that, because the ascendant never entered the arithmetic. The number is 32 either way.
Be careful with Mangal dosha too. Which houses count varies by region, some traditions count from the Moon or from Venus instead, and there is a long list of cancellations, including Mars in its own sign or a matching Mars in the other chart. There is no controlled evidence that the rule predicts marital outcomes. What it does have going for it is that it looks at the whole chart rather than one lunar slice.
The honest summary is this. A high koota score tells you the two Moons agree by table. It does not tell you the charts agree. Those are different claims, and only one of them is being measured.
What the evidence does and does not support
It would be dishonest to explain all this and then imply the deeper reading is proven while the score is not. Neither is proven.
There is no published, peer-reviewed body of work showing that Guna Milan scores predict divorce, satisfaction or anything else about a marriage. The few attempts to test astrology against birth data have generally found no effect, and studies of ashta koota specifically are close to nonexistent. There is also a plain statistical problem. In many communities almost every arranged match is screened to clear 18 points, so nearly all marriages in the sample already have a passing score, and the outcomes still vary enormously. Whatever separates a good marriage from a hard one, the score is not tracking it in any way anyone has demonstrated.
So why bother computing it correctly? Because if you are going to use a traditional framework, you should at least use the real thing. That means sidereal positions from a proper ephemeris, with a stated ayanamsha, the correction that converts tropical positions to star-based ones. A Moon near a nakshatra boundary can flip Nadi and move the total by 8 points, and a sloppy calculation gets that wrong.
Use it as a structured way to talk about temperament and expectations, which is a real use. Do not use it as a prediction. If you want to compare charts, our compatibility for every pairing pages show what each combination is traditionally said to emphasise, and where the tradition itself disagrees.
How to read a match without letting a number decide
A few practical habits make koota matching more useful and less coercive.
Ask for the breakdown, not the total. Which of the eight kootas failed, and did the astrologer apply any cancellation rules? If the answer is that Nadi failed but was cancelled, you should know that, because another astrologer may not cancel it.
Ask what the rest of the chart says. Where is Venus, where is Mars, what sits in the 7th house from each rising sign, and what does the Navamsa show? If the reading stops at 36 gunas, it stopped early.
Watch for the direction of causation in your own thinking. Families often decide first and then look for a score that agrees, or reject someone and then point at the score. The number is easy to bend, since cutoffs and cancellations both vary. If you notice the astrology is being used to justify a conclusion already reached, name it.
And keep the ordinary evidence in front of you. How the two of you handle money, disagreement, family pressure, illness and boredom is observable, and it is what the marriage will be made of. Astrology at its best gives you a vocabulary for describing tendencies and a reason to have the conversation. It does not give you a guarantee, and no honest astrologer will offer one. Treat a low score as a prompt to look harder, not as a verdict, and treat a high score the same way.
Guna Milan turns two Moon positions into a number out of 36, and that is genuinely all it does. Bhakoot and Nadi alone control 15 of those points, their cancellation rules are disputed, and the calculation never looks at Venus, Mars, Saturn, the 7th house, the Navamsa chart or the timing of planetary periods. A 32 can sit on top of a chart pattern the tradition itself would flag. None of it is backed by evidence that it predicts how a marriage goes, so use the score as a starting point for a real conversation about the whole chart and about the two people, and never as the answer.
Questions people ask
What score is considered good enough?
The common north Indian convention treats 18 or more out of 36 as acceptable, 24 and above as good, and below 18 as a caution. But that cutoff is a convention, not a law, and south Indian practice often weighs a different and smaller set of factors. Because cancellation rules for Bhakoot and Nadi can shift a total by up to 15 points, the same pair of charts can be scored differently by two competent astrologers. Ask which kootas failed rather than fixating on the total.
Does the exact birth time matter for guna milan?
Less than you would expect. The whole score comes from the Moon's position, and the Moon moves about 13 degrees a day, so it stays in one nakshatra for roughly 24 hours. If your Moon was in the middle of a nakshatra, an hour of error changes nothing. If it was near a boundary, an error of even minutes can flip the nakshatra and swing the score by up to 8 points through Nadi alone. Birth time matters enormously for everything else in the chart, including the rising sign and the 7th house, which guna milan ignores.
Should we call off a marriage over Nadi dosha or a low score?
That is your decision and not something a score should make for you. What we can say plainly is that there is no published evidence that ashta koota results predict how a marriage will go, and that Nadi dosha carries a set of cancellation rules that astrologers do not agree on. A low score is a reasonable reason to look more carefully at both full charts and to talk honestly about temperament and expectations. It is a weak basis for ending something that otherwise works.
If the score misses so much, is kundli matching worth doing at all?
It is worth doing if you know what you are getting. A correctly computed match tells you how the two Moon positions relate under a traditional set of rules, and it gives families a shared vocabulary for a difficult conversation. That has real social value. What it does not give you is a forecast. The more informative work is reading both charts properly, including Venus, Mars, Saturn, the 7th house and the Navamsa, and even that is a traditional framework rather than a tested one.
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