You chose each other. Now the family asks for a match.

It is a common moment. Two people have met, at college, at work, through friends or online, and decided they want to marry. Then a parent or a grandparent says: "First, let us get the kundlis matched." A kundli (kundali, the birth chart) is drawn for each of you, the two are compared, and a number out of 36 comes back.

For many couples this is the first time astrology enters the relationship, and the number can feel like a verdict on a choice already made. This guide is here to take the mystery out of that number. It explains what the score actually compares, what the parts that worry families mean, and what the score does not decide.

Families differ on this, and none of their positions is the only Hindu one. Some families will not go ahead without a match. Some ask for one as a formality, to settle the elders’ minds. Some never ask at all. In much of South India, families read a set of ten tests called the poruthams instead of a 36-point total; our guide to Dasa Porutham and the 36 gunas compares the two. This guide does not tell you whether your family should match the charts. It explains what the result says when they do.

A marriage by choice is not new to the tradition

The classical texts already know a marriage that begins with the couple’s own choice. Manu Smriti (the Laws of Manu, a classical text on dharma), at verse 3.21, lists eight forms of marriage, and one of them, Gandharva vivah, is a union by the mutual consent of the two people. Our guide to Vivah, the Vedic wedding sets out all eight forms and how the texts ranked them.

Manu Smriti 3.32 defines the Gandharva form as the union of the two by their own wish. Unlike the Brahma form (3.27), there is no giving of the daughter by her father. Many couples who chose each other today still marry with the full rite, with the kanyadana (the parents’ giving of the daughter), the sacred fire as witness and the seven steps of the Saptapadi. The choice comes first, and the samskara (the sacrament, one of the sixteen life rites) still follows. Our sixteen samskaras guide places the wedding among the other rites of a life.

Kundli matching sits beside this, not inside it. It is a comparison of two birth charts that families use to think about a marriage. It is not one of the rites of the wedding, and it does not decide whether a marriage is valid.

What the 36 points actually compare

The usual matching method in North India is Ashtakoot, "eight parts". It compares the two charts in eight tests called kootas (koota, "part" or "group") and gives each a fixed number of points. The points are what families call the gunas, so "24 gunas" means 24 of the 36 points.

Here is the important thing for a couple: all eight kootas read only two facts from each chart. One is the Moon sign, the rashi the Moon was in at birth. The other is the birth star, the nakshatra the Moon was in, with its pada (quarter). The score does not read your ascendant, your houses, your planets’ strength or your dashas (the planetary periods a chart runs through over a life). It does not read anything about how you met, how long you have known each other, or how you treat each other.

Four kootas read the two Moon signs, 15 of the 36 points. Varna (1 point) sorts the Moon signs into four groups. It reads the signs only, not caste or family; our Varna koota guide gives the table. Vashya (2 points) sorts them into five groups. Graha Maitri (5 points) asks whether the planets that rule the two Moon signs are friends. Bhakoot (7 points) looks at how far apart the two Moon signs sit.

Four kootas read the two birth stars, 21 of the 36 points. Tara (3 points) counts from one star to the other in groups of nine. Yoni (4 points) gives each star one of 14 animals and compares them. Gana (6 points) gives each star one of three temperaments: Deva (gentle, idealistic), Manushya (practical, balanced) or Rakshasa (intense, independent). Nadi (8 points) puts each star in one of three groups.

Tradition gives each koota a meaning, such as temperament for Gana or affection for Bhakoot. Those meanings are how families talk about the score. The calculation itself is the fixed table behind each one, applied to two Moon signs and two stars. Our 36-gunas guide explains each koota in more depth.

A low total: what it means, and what it does not

A low total is common, and that matters for how you read yours. Our engine scored every pairing of the 108 star quarters (27 stars × 4 padas) against each other, 11,664 pairings in all. About one pairing in four (23 %) comes out below 18 of 36. About three in ten reach 27 or more.

Our matching reports the total in three tiers. A total of 27 or more (75 % of the points) is a strong total. From 22 up to 26½ is a workable total. Below 22 is a mixed total. A mixed total means three or more of the eight comparisons came out below full. It does not mean the match is forbidden.

You may hear that 18 of 36 is the minimum. That number is widely followed, and no classical text we can cite states it. We label it a convention, and so does our score reader. A family that treats 18 as a hard line is following a custom, which it is free to do; it is not following a rule from a text.

Most of all, a total hides its parts. Nadi and Bhakoot together carry 15 of the 36 points, so a zero in either one moves the total by 7 or 8 points on its own. A 24 with every koota in the middle reads very differently from a 24 with Nadi at 0. Read the eight scores, not the one number.

Nadi 0: what the zero means

Nadi (nāḍī, "channel") sorts the 27 birth stars into three groups of nine. When your two stars fall in different groups, the pair scores all 8 points. When they fall in the same group, the pair scores 0 of 8, and that zero is what families call Nadi dosha (dosha, "fault"). Across all 11,664 star-and-pada pairings, one in three shares a Nadi.

A widely followed set of exceptions gives the 8 points back for some same-Nadi pairs, and our matching applies three of them: the same Moon sign with different stars; the same star in different Moon signs; and the same star in different padas. Two cases get no exception in our matching. One is two different stars in two different Moon signs. The other is the same star in the same pada. It is rare: 1 pairing in 108. Some sources exempt even this case for certain stars, but their lists differ, so our matching does not apply that rule. After the three exceptions, about 29 % of all pairings still score Nadi 0. Our Nadi Dosha check tells you, from your two stars, whether one of the exceptions applies.

Bhakoot 0, and what a zero does not decide

Bhakoot (7 points) reads how far apart your two Moon signs are. Three distances score 0 of 7: signs 2 and 12 apart, 5 and 9 apart, and 6 and 8 apart. Our matching gives the 7 points back when the planets that rule the two Moon signs are the same planet or natural friends of each other. After that rule, about one pairing in four (26 %) still scores Bhakoot 0.

Some calculators apply these exceptions and some do not, which is one reason two sites can give the same couple two different totals. Our guide to why matching sites give different scores goes through every cause. If your sheet shows a Nadi 0 or a Bhakoot 0, check the exceptions before you treat the zero as final, and read our Nadi and Bhakoot guide for the full picture.

What a zero does not decide: it is one comparison of two Moon positions. It does not read the rest of either chart, and it does not say what will happen in your marriage. Families who take it seriously usually take it, with both full charts, to an astrologer they trust. That is a conversation, not a sentence.

Manglik: a line beside the score, not inside it

Mangal dosha (Mangal is Mars), often written "Manglik", is not one of the eight kootas and is not counted in the 36 points. It is a separate check, and it needs both full birth charts with the birth time, because it reads where Mars sits in the chart.

Our charts count it this way: the sign Mars sits in, counted from three points, the lagna (rising sign), the Moon and Venus. If any count lands on house 1, 2, 4, 7, 8 or 12, the chart carries Mangal dosha by that count. Counted from three points, most charts carry it: about nine in ten in our own sample. A line that most people carry cannot, on its own, mark a match as unusual.

In matching, the classical pairing rule reads both charts together. When both charts carry it, the rule treats it as balanced between them. When only one does, the rule asks for a closer look at both charts. Traditions differ a great deal on what cancels the dosha within a single chart, and our matching applies none of those within-chart rules; it reports the pairing rule only.

So a "Manglik: yes" on one side is a reason to read both charts more closely, with the method stated. It is not a finding about the person. Our Mangal dosha guide goes through the houses, the reference points and the cancellations in full.

Check it yourselves, from two birth stars

You do not need to wait for someone else’s printout. Our kundli milan page gives you five ways in, and it saves nothing you type.

If you were handed a total, enter it, and the page reads it back: which tier it is in, and whether a total that size could still hide a Nadi 0 or a Bhakoot 0. If the family’s sheet lists all eight koota scores, enter them: the page reads them back, adds them up and, if you entered a total above, tells you if the two differ. It also says whether Nadi or Bhakoot is 0. If you have the two birth stars and their padas, enter both, and the page scores all eight kootas from them. For two padas, the first pada of Purva Ashadha and the second pada of Shravana, one koota depends on where in the pada the Moon sits, and the page then shows a small range.

If you have only the two birth dates, the page scores every pairing of star and pada the two days allow and shows the range. If you have both full birth details, date, time and place, the page matches the two charts and adds the Mangal dosha check. Our guide to matching without a birth time explains what each starting point can and cannot settle.

One detail surprises couples. The page asks which star is the boy’s and which is the girl’s, because our tables read two kootas, Varna and Gana, from one side to the other. Swapping the two changes the total by at most 2 points, and leaves the other six kootas as they are. If you have a marriage biodata with the kundli lines on it, our biodata guide shows where the star and pada are written.

Practical takeaway: when the family asks for a match, ask for the eight koota scores, not only the total, and enter them on the kundli milan page. Check any Nadi 0 or Bhakoot 0 against the exceptions. Ask how the Manglik line was counted and from which points. Then talk about the result together, as information about two Moon positions, not as a verdict on a choice you have already made.

• The 36 points read only the two Moon signs and the two birth stars.
• The 18-of-36 minimum is a convention; no text we can cite states it.
• Nadi 0 and Bhakoot 0 each have exceptions that give the points back; check them first.
• Mangal dosha sits beside the score, needs both full charts, and is carried by most charts when counted from three points.