Love Compatibility

Love compatibility on Astro Clock AI is not a separate formula. The button above opens the free match tool, which runs the same eight-koota Ashtakoot engine as Kundli matching and the signed-in Compatibility page. What this page does is take the parts of that engine the intro above names - Graha Maitri, Gana and Yoni, plus the Mulank and Bhagyank harmony - and open them all the way: every lord pair, every gana pairing, every animal, and every harmony cell, counted across all possible inputs. It also covers the Business and Friendship readings, which use a smaller set of kootas and so behave differently from Marriage.

The mechanics of Varna, Vashya, Tara, Bhakoot and Nadi, what a missing birth time does to the score, and how Marriage scores spread across all pairings are on the Kundli matching page. The full koota and nakshatra tables are on the Compatibility page. Neither is repeated here.

Where the matching rules come from, and where they do not

Before the numbers, one plain fact about sources. For this page every text file in the app's library was searched for the words koota, kuta, Ashtakoot, Guna Milan and Yoni: the classics (Brihat Parashara Hora Shastra in two translations, Saravali, Bhrigu Sutras, Jyotisha Siddhanta Sara, Daivajna Vallabha, Advanced Predictive Astrology) and all ten numerology books. None of them contains a rule for matching two people by koota. The only "Koota" in the whole library is Koota Yoga in Saravali, which is one of the Nabhasa yogas of a single chart and has nothing to do with marriage. The engine's own header comment reaches the same conclusion and explains why its tables were left unchanged. The books are listed on the sources page.

That leaves different amounts of footing for the three kootas covered here:

• Graha Maitri has half a source. Who counts as whose friend, neutral or enemy comes from BPHS Ch. 3 Sl. 55, and the engine's lists match that sloka exactly. How many points each combination is worth comes from no book in the library; since October 2026 the engine follows published Kundli-matching references where they agree, named in its header.
• Gana has none. BPHS does use the words Deva, Manushya and Rakshasa, but in Ch. 6 Sl. 12 they name the nine navamsas of a sign in rotation, not the 27 nakshatras. No book here lists a gana for each nakshatra; the engine's list follows the published references named in its header, which agree on all 27 (Ardra moved to Manushya in October 2026).
• Yoni has none. No book in the library assigns an animal to a nakshatra or lists hostile animal pairs.

Graha Maitri: seven lords, twenty-one pairs

Graha Maitri reads the lords of the two Moon signs. Seven grahas rule the twelve signs - Rahu and Ketu rule none, so they never enter this koota. The engine note calls the result mental rapport. It is worth 5 of the 36 Marriage points and 5 of the 21 Business or Friendship points, so it weighs almost a quarter of the shorter readings.

What BPHS Ch. 3 Sl. 55 actually derives

The sloka gives a counting rule rather than a list. From a graha's moolatrikona sign, take the 2nd, 4th, 5th, 8th, 9th and 12th signs, and add its sign of exaltation. The lords of those signs are its friends; the lords of the other signs are its enemies. A graha that owns two signs can land on both sides of the count, and then, in the translation's words, "then it is neutral, or equal". Run that rule for all seven and three lists come out, not one.

Two things stand out. Friendship is not always mutual: the Moon counts Mercury a friend while Mercury counts the Moon an enemy, and Mercury counts the Sun a friend while the Sun holds Mercury neutral. And the Moon has no enemies at all.

The sloka that follows, Sl. 56, adds a temporary relationship read from where two grahas sit in one chart, and the next slokas combine the two into five grades. The app does use that fivefold scheme elsewhere, to grade a planet's dignity in a single chart (docs/numerology-rules.md §7a). Graha Maitri does not. It compares two different people's sign lords, who sit in no shared chart, and reads only the natural relations.

How the twenty-one lord pairs score

The engine's rule since October 2026: the same lord on both sides scores 5; otherwise it reads how each lord regards the other - friend, neutral or enemy - and scores the pair. Seven grahas make twenty-one unordered pairs. Grouped by what the sloka calls each side, they fall like this:

Until October 2026 the engine had no neutral or enemy step, an audit point its header recorded: Mars with Venus scored the same 1 as the Sun with Saturn. No book in the library states how many points each grade carries, so the engine now follows published references where they agree - friend-friend 5, friend-neutral 4, neutral-neutral 3, enemy-enemy 0 - and keeps its old values for the two cells where they disagree: friend-enemy (1 in some references, 2 in another; the engine keeps 3) and neutral-enemy (0.5 or 1; the engine keeps 1). If another tool gives you a different figure for Moon-Mercury or for a neutral-enemy pair, this is where the difference comes from.

Every Moon sign's partners at 5, 4, 3, 1 and 0

Because the koota reads only the lord, it is quickest to see by sign. Across all 144 ordered sign pairs, 56 score 5, 20 score 4, 20 score 3, 40 score 1 and 8 score 0. The zodiac splits into two camps: signs ruled by the Sun, Moon, Mars and Jupiter on one side, and signs ruled by Mercury, Venus and Saturn on the other. Within a camp the score is usually 5; across camps it is usually 1, and 0 for Leo with a Venus- or Saturn-ruled sign.

A Leo Moon never scores in the middle: the Sun is a mutual friend of the Moon, Mars and Jupiter, holds Mercury neutral while Mercury holds it a friend (4), and is a mutual enemy of Venus and Saturn (0). A Cancer Moon has no 0 at all, because the Moon has no enemies. Across the 108 nakshatra quarters the shares are the same as for signs: 38.9% of pairings score 5, 13.9% score 4, 13.9% score 3, 27.8% score 1 and 5.6% score 0.

Gana: three temperaments, nine pairings

Gana sorts the 27 Moon nakshatras into three groups - Deva, Manushya and Rakshasa - and the engine note calls it behavioural temperament, how each person reacts under stress. It is worth 6 points and counts in all three reading types. In the engine's table nine nakshatras are Deva, nine Manushya and nine Rakshasa. The nine Rakshasa nakshatras are Krittika, Ashlesha, Magha, Chitra, Vishakha, Jyeshtha, Mula, Dhanishta and Shatabhisha; Ardra, listed as Rakshasa until October 2026, is Manushya.

The engine stores the three gana as the numbers 0, 1 and 2 and scores by their distance. So Manushya, sitting in the middle, can never score 0 with anyone, and the only zero is Deva with Rakshasa. Over the 729 nakshatra pairs, 243 share a gana (6 points), 324 are one step apart (3) and 162 are Deva with Rakshasa (0). Across the 11,664 quarter pairings that is 33.3% at 6, 44.4% at 3 and 22.2% at 0.

The engine header records two audit findings about this koota: that Ardra sat under Rakshasa, and that mixed pairs are scored on this simple three-step scale rather than a fuller matrix. No book in the library gives a nakshatra gana list or a gana point grid. In October 2026 Ardra was moved to Manushya, where three published references agree; that turned every Ardra pairing with a Deva nakshatra from 0 into 3, and every Ardra pairing with another Rakshasa nakshatra from 6 into 3. The point grid was not changed: the references disagree on every mixed cell - two give Deva-Manushya 5 and Manushya-Rakshasa 1, two give a bride-and-groom grid with Manushya-Rakshasa 0 - and this tool has no bride or groom field, so the score cannot depend on order.

Yoni: fourteen animals, seven enmities

Yoni gives each nakshatra an animal and is the koota the engine describes as instinctive and physical compatibility. It is worth 4 points and counts only in a Marriage reading: Business and Friendship ignore it entirely. Thirteen animals cover two nakshatras each. The fourteenth, Mongoose, covers only Uttara Ashadha. Each animal has exactly one enemy in the engine's table.

The scoring has three values: 4 for the same animal, 0 for the listed enemy, 2 for anything else. Over the 729 nakshatra pairs, 53 share an animal, 52 are enemies and 624 - more than eight in ten - take the middle 2. Across the 11,664 quarter pairings, 7.3% score 4, 7.1% score 0 and 85.6% score 2. So for most couples Yoni is a flat 2 of 4 that neither helps nor hurts much. It moves the total only at the two ends.

The single Mongoose has two side effects. An Uttara Ashadha Moon can score 4 only with another Uttara Ashadha Moon, since no other nakshatra shares its animal, and its only enemies are Rohini and Mrigashira. The engine has no in-between grade, such as friendly or neutral animals; whether a fuller grade exists is something no book in the library addresses, so this page does not guess at one.

Business and Friendship: the four-koota reading

Pick Business or Friendship on the match tool and the score changes scale. computeCompatibility() keeps four kootas - Graha Maitri, Gana, Tara and Bhakoot, the list the code names MENTAL_KOOTAS - and drops Varna, Vashya, Yoni and Nadi. The maximum becomes 5 + 6 + 3 + 7 = 21. Business and Friendship are scored identically: the type name changes the label on the screen and nothing else. The same verdict bands apply to the share of 21 as to the share of 36.

Three consequences follow from that choice of four. First, the reading no longer depends on who is entered first. Varna was the only one-directional koota, and all four that remain are symmetric, so swapping the two people gives the same Business score every time. Second, Yoni and Nadi - together 12 of the 36 Marriage points - are gone, so the two kootas most often quoted in marriage talk say nothing here. Third, Bhakoot's all-or-nothing 7 is now a third of the maximum, so a single Moon-sign distance can move the verdict on its own.

The four-koota score is lumpier than the eight-koota one. The two most common values are 12.5 (1,332 pairings) and 9.5 (1,248), and a perfect 21 of 21 occurs 476 times, 4.1% of all pairings. The perfect Marriage score is not reachable at all - the highest is 34.5 of 36 - but a perfect Business score is not rare.

Does the verdict word change between Marriage and Business?

Often. Comparing the Marriage verdict and the Business verdict for the same two Moons across all 11,664 pairings: 45.0% keep the same word, 20.3% get a better word for Business, and 34.8% get a worse one. The largest single shifts are Workable for Marriage falling to Mixed for Business (2,370 pairings), Mixed for Marriage rising to Workable (1,218), and Mixed falling to Challenging (964). 147 pairings move by two bands. So if a friend runs your pair as Business and gets a different word from your Marriage reading, that is the expected behaviour of the tool, not an error.

Which koota the result points at

The result names one koota as the area needing most attention: the lowest score as a share of its own maximum, among the kootas that count. For Business and Friendship that is one of the four. Across all pairings it lands on Bhakoot 36.9% of the time, Gana 24.3%, Graha Maitri 21.5% and Tara 17.3%. Ties go to whichever koota comes first in the engine's order, which is Tara. That has an odd edge: on a perfect 21 of 21 every koota is at 100%, so the summary still names Tara, at 3 of 3, as the area to watch. Read that line as the engine's tie-break, not as a weakness.

Mulank and Bhagyank harmony, measured

Beside the kootas, every reading - Marriage, Business or Friendship alike - compares two numbers from each birth date. The Mulank is the day of the month reduced to one digit; the Bhagyank is all the digits of the date added and reduced, keeping 11, 22 and 33 (docs/numerology-rules.md §1 and §2, and Mulank, Bhagyank and Life Path). The numerology profile calculator and the life path calculator compute them on their own. The match reads the calendar date as typed, not the UTC instant, so a birth just after midnight in India is numbered on the right day.

numerologyMatch() makes exactly two lookups in NUMEROLOGY_HARMONY, the app's one harmony table: is B's Mulank on A's list, and is B's Bhagyank on A's list. Two yeses give Strong, one gives Workable, none gives Needs effort. There is no weighting between them - a Mulank match and a Bhagyank match count the same - and the result never changes the koota score.

Three properties of the table, checked cell by cell, are not stated anywhere else. It is symmetric: whenever 4 lists 7, 7 lists 4, and so on for every pair, so the label does not depend on who is entered first. Every number lists itself, so two people with the same Mulank always get a Mulank yes. And 37 of the 81 cells are yes, a little under half.

Birthdays are not spread evenly over the nine Mulanks. Mulank 1 collects four days of every month (1, 10, 19, 28), while 5 to 9 collect only three. Weighting by real calendar dates from 1950 to 2009 (21,915 days), here is how wide each Mulank's harmony list is in practice:

So a Mulank 7 gets a Mulank yes with fewer than one birthday in three, and a Mulank 5 with more than half. Pairing the same 21,915 dates with each other, the label comes out Strong 20.8% of the time, Workable 49.6% and Needs effort 29.6%. Workable is simply the most likely result, and Needs effort is common enough that it should not be read as unusual.

Why the master-number collapse matters

The harmony table has rows for 1 to 9 only. A Bhagyank of 11, 22 or 33 once found no row and was treated as "no harmony", even against an identical 11. numerologyMatch() now reads a master at its root for this lookup - 11 as 2, 22 as 4, 33 as 6 - citing the Master Numbers page of Advanced Vedic Numerology, which says master-number people start off reflecting the potential of a 2, 4 and 6. The Bhagyank shown on screen keeps its master value. The fix is not a corner case: in the 1950-2009 dates, 17.6% of birthdays have a master Bhagyank (11 alone is 9.6%). Without the collapse, nearly one person in six could never have scored a Bhagyank yes.

What the numerology books say about pairing numbers

The rules doc records NUMEROLOGY_HARMONY as the app's single harmony table and does not attribute it to one book. Three numerology books in the library that the Compatibility page does not discuss each take up number compatibility, and each does it differently. Setting them beside the table shows what the label can and cannot claim.

Life Path lists in The Numerology and Its Metaphysical Secret

Chapter 9 of this book compares the two Life Path numbers - the same full-date number the app calls Bhagyank - and says it carries "quite a bit of weight" without being the only factor. It gives each Life Path a short "most compatible" list.

The overlap is partial. For 7 and for 9 the two lists share nothing at all: the book pairs a 9 with 6 and 2, and the app pairs it with 1, 3, 5 and 9. The book never lists a number as compatible with itself, while the app always does. The book's lists are also not mutual - 4 lists 7 and 1, but neither 7 nor 1 lists 4 - while the app's are. One point in the app's favour: the book gives 11 exactly the same list as 2, and 22 exactly the same list as 4, which is the same collapse numerologyMatch() makes.

Five aspects in Numerology Made Easy

William Mykian's Chapter 12 (pp. 131-138) does not use a lookup table at all. It compares five numbers per person - full birth name, its vowels, its consonants, the full birth date, and the name plus the date - and looks for "major connections" where one person's number is in tune with another's. A balance, it says, comes from two or three major connections. Its worked chart reads an 8 with a 6 as a neutral connection, and flags a 6 with an 11, and an 8 with an 11, as potential major disconnections to examine. The app's table would call all three harmonious, since 8 lists 6, and 11 is read as 2, which both 6 and 8 list. Mykian also warns that the whole determination "does not lend itself easily to black and white clarity". The app's three-word label is a much blunter instrument than his method, and needs no name.

Combined root numbers in Power of Numbers

Tan's Chapter 22 adds the two people's Root Numbers together, reduces the sum, and reads the relationship from a nine-row table: a combined 1 is described as two independent people, a 7 as a sociable pair with many friends, a 5 as prone to obstacles. Elsewhere, in its profile of Number 8, the same book says the only number compatible with an 8 is another 8. The app's table lists 8 with 2, 6, 7 and 8. Neither the combined-root method nor that line is used by the match tool. The disagreement is real, and the general reasons the app prints its own table rather than averaging the books are set out in when astrology and numerology disagree.

Meera and Kabir: one pair, three readings

Two invented people, run through the real engine. Meera was born on 3 February 1993 at 07:45 IST in Pune; Kabir on 22 August 1991 at 18:20 IST in Lucknow. Neither is a real person. Meera's Moon falls at 57.78° sidereal, in Taurus and in Mrigashira. Kabir's falls at 273.46°, in Capricorn and in Uttara Ashadha.

The three kootas this page covers can each be checked by hand. Graha Maitri: Taurus is ruled by Venus and Capricorn by Saturn; Venus lists Saturn as a friend and Saturn lists Venus, so it scores 5 - the friend-and-friend row of the lord table. Gana: Mrigashira is Deva and Uttara Ashadha is Manushya, one step apart, so 3. Yoni: Mrigashira is a Serpent and Uttara Ashadha is the lone Mongoose, the one enemy pair that involves the single-nakshatra animal, so 0. Tara, for completeness: counting from the 5th star to the 21st gives 17, which passes; counting back gives 12, which leaves 3 on division by 9 and fails; one pass of two scores 1.5.

The pair shows the type switch at work, and the October 2026 Bhakoot change. Taurus and Capricorn are five and nine signs apart, which now scores 0 (it scored 7 before, and the pair read 26, Workable, and 16.5, Strong). As a Marriage reading, Yoni at 0 and Bhakoot at 0 tie for the lowest share and Yoni comes first in the engine's order, so it is named. As Business or Friendship, Yoni is not counted and Bhakoot's 0 of 7 is the lowest share; the full Graha Maitri is not enough to lift 9.5 of 21 out of Mixed.

Swapping the two people changes nothing here: both Moons are in earth signs, so even Varna gives 1 either way, and the Marriage total stays 19.

The numbers half is the same in all three readings. Meera's Mulank is 3 (the day, 3) and her Bhagyank is 9 (3 + 2 + 1 + 9 + 9 + 3 = 27, then 9). Kabir's Mulank is 4 (22, then 4) and his Bhagyank is 5 (2 + 2 + 8 + 1 + 9 + 9 + 1 = 32, then 5). Mulank 3's list is 1, 3, 5 and 9, which does not include 4: no. Bhagyank 9's list is 1, 3, 5 and 9, which includes 5: yes. One yes gives Workable, and the screen's note pairs "The Communicator" with "The Builder" as a pairing that needs conscious effort - that sentence describes the Mulank lookup only. The Metaphysical Secret book, by contrast, lists neither 9 nor 5 for the other, so on its Chapter 9 lists this pair would not be a recommended Life Path match at all.

Reading the result without over-reading it

• Everything on the koota side comes from two points: the Moon sign and the Moon nakshatra of each person. No Ascendant, no Venus, no 7th house. Two couples with the same two Moons get the same score whatever else is in their charts.
• The engine never asks for gender and never uses it. In a Marriage reading only Varna depends on order; in Business and Friendship nothing does.
• The labels describe a position in a fixed table. "Challenging match" and "Needs effort" do not forecast an outcome, and the app offers no remedy, ritual or gemstone to change them.
• Two of the three kootas covered here, Gana and Yoni, have no source in the app's library. Graha Maitri's friend lists do, its point scale does not; the Gana list and the Graha Maitri points follow published web references, named in the engine header. Weigh them accordingly.
• Moon positions come from the app's own astronomy code, described on the methodology page. A Moon near a nakshatra boundary can change Gana and Yoni with a small change in birth time; how the match tool reports that is covered on the Kundli matching page.

Related tools and reading

• Free match tool - run Marriage, Business or Friendship for two dates.
• Kundli matching - Varna, Vashya, Tara, Bhakoot and Nadi in depth, and the birth-time check.
• Compatibility feature - the full koota tables, the numerology consensus and the deeper read for saved profiles.
• Moon sign calculator and nakshatra calculator - the two inputs every koota reads.
• Moon sign and nakshatra - why matching starts from the Moon.
• Numerology profile - your Mulank, Bhagyank and favourable numbers from the same harmony table.
• Number 8 in numerology - one of the numbers the books disagree about most.

Is love compatibility scored differently from Kundli matching?

No. Both open the same match tool and the same engine. "Love" is not one of the reading types; the types are Marriage, Business and Friendship, and Marriage is the default. This page simply looks closely at the kootas and the number check that the intro above describes.

Why did Business give us a better verdict than Marriage?

Business and Friendship count only Graha Maitri, Gana, Tara and Bhakoot, out of 21. If your low points were in Yoni, Nadi, Vashya or Varna, they drop out. Across all pairings the verdict word changes between the two readings a little over half the time, more often for the worse.

Our Moon-sign lords are neutral to each other, not enemies. How many points is that?

Since October 2026, 3 of 5. The engine reads friend, neutral and enemy from BPHS Ch. 3 Sl. 55 and scores neutral-neutral 3, friend-neutral 4 and enemy-enemy 0, as published references agree. Before that it told only friend from not-friend, and a neutral pair such as Mars and Venus scored the same 1 as the Sun and Saturn.

Is a Rakshasa nakshatra a bad sign for a relationship?

In this tool it is a label in a scoring table. A Rakshasa Moon scores 6 with another Rakshasa Moon, 3 with a Manushya Moon and 0 with a Deva Moon. Nothing in the app reads it as a judgement on a person, and no book in the library lists the nakshatra ganas at all; the engine's list follows published references.

Our Yoni animals are enemies. What does 0 of 4 change?

It removes 4 points from a Marriage total and makes Yoni the likeliest candidate for the area needing most attention. It has no effect on a Business or Friendship reading, where Yoni is not counted. About 7% of all pairings land on an enemy pair.

Which matters more, the koota score or the numerology label?

They are reported side by side and never combined. The numerology label does not change the koota score or the verdict, and the koota score does not change the label. The label comes from two lookups in one table.

My Bhagyank is 11. How is it matched?

For the harmony lookup it is read as 2, so it is harmonious with 2, 4, 6 and 8. The screen still shows 11. The same collapse is used for 22 (read as 4) and 33 (read as 6).

A numerology book I own gives a different compatible list. Which is right?

The books in the app's own library disagree with each other on this, as the comparison above shows. The app uses one table, NUMEROLOGY_HARMONY, so that every page gives the same answer; it does not claim that table is the only reading.