Ashtakoota guna milan scores a couple on eight separate measures worth 36 points in total. The calculator above works out all eight from two birth charts, then checks Nadi, Bhakoot and Mangal dosha on both. Here is what each number actually means before you read your own.
Guna milan is not one score. It is eight small tests, each weighted differently, added together. The weighting is the part most people miss: Nadi alone is worth 8 of the 36, while Varna is worth 1. Two couples can both score 24 and be in completely different positions, because one may have lost those points on Varna and Vashya and the other on Nadi.
Every koota is computed from the Moon, not the Sun. What matters is the sign and nakshatra the Moon occupied at each birth, which is why an accurate birth time helps and a wrong one quietly changes the answer. The Moon moves about one degree every two hours, so it crosses a nakshatra boundary roughly once a day.
The conventional bands are these. Below 18 out of 36 is traditionally treated as insufficient. From 18 to 24 is workable, and this is where most real couples land. From 25 to 32 is considered strong. Above 32 is rare enough that many astrologers treat a very high score with the same caution as a very low one, because near-identical charts can mean near-identical weaknesses.
What the band does not tell you is where the points were lost. A 19 that is missing Varna, Vashya and Tara is a different marriage from a 19 that is missing Nadi. The calculator shows the eight lines separately for exactly this reason, and your total is far less informative than the shape of it.
Nadi dosha means both charts fall in the same nadi, which costs all 8 points and is the objection raised most often in Indian matchmaking. Classical texts list cancellations that are routinely ignored: the dosha is held not to apply when both partners share the same moon sign but different nakshatras, when they share a nakshatra but sit in different padas, or when the moon-sign lords are the same planet.
Bhakoot dosha is the 6 to 8 or 2 to 12 moon-sign relationship, costing 7 points. It is conventionally cancelled when Graha Maitri is full, or when the two moon-sign lords are the same planet or natural friends. Because Graha Maitri and Bhakoot are read together, a chart that scores 5 on one and 0 on the other is a recognised pattern rather than a disaster.
Mangal dosha sits outside the 36 entirely. It is a placement of Mars in the 1st, 2nd, 4th, 7th, 8th or 12th house, and it is checked separately on each chart. Two Manglik partners are traditionally considered to cancel each other. The calculator reports it per chart rather than folding it into the score, because that is how it is actually read.
Guna milan is a compatibility screen built entirely from the Moon. It says nothing about the seventh house, which is the house of marriage itself, nothing about the dasha periods either person is running, and nothing about the strength of Venus or Jupiter in either chart. An astrologer looking at a real match will read all of those before the 36.
It also cannot see anything outside the chart. A score is a starting point for a conversation, not a verdict on two people. If your number came out low and it matters to you, the useful next step is having someone read both charts properly rather than recalculating the same eight kootas somewhere else.
Eighteen and above is traditionally considered acceptable, 25 and above is strong. Most real couples land between 18 and 24. Below 18 is treated as insufficient on its own, though astrologers routinely approve lower scores when the doshas are cancelled and the seventh house is sound in both charts.
Partly. Without a time you cannot place the Moon precisely, so the nakshatra can be wrong on days when the Moon changes star, which affects Tara, Yoni, Gana and Nadi. Varna, Vashya, Graha Maitri and Bhakoot depend only on the moon sign and are usually safe. Treat a timeless match as indicative.
Yes, and classical texts themselves list the cancellations. Nadi dosha does not apply when both partners share a moon sign with different nakshatras, when they share a nakshatra in different padas, or when the moon-sign lords are the same planet. Many long marriages carry it uncancelled.
Mangal dosha is Mars occupying the 1st, 2nd, 4th, 7th, 8th or 12th house. It is read separately on each chart, not as part of the 36. The oldest and most widely used cancellation is that two Manglik partners neutralise it between them.
Almost always the ayanamsa or the birth time. Kismo uses Lahiri, the Indian government standard, and computes real sidereal positions rather than a lookup table. A difference of a few minutes in birth time can move the Moon across a nakshatra boundary and change four kootas at once.
No. Ashtakoota is the northern system. Much of the south uses Dashakoota, which has ten kootas and a different weighting, and Kerala practice differs again. The calculator above runs Ashtakoota, which is the system most people mean by guna milan.
No, and a score above 32 is uncommon enough that many astrologers look at it twice. Near-identical charts share strengths and weaknesses alike. The 36 is a screening tool built only from the Moon, and it cannot see the seventh house, the running dasha, or anything outside the chart.