Nadi Dosh is the most heavily weighted flaw in Ashtakoot Guna Milan, the eight-fold system used to match a couple's horoscopes for marriage. It arises when both partners fall in the same Nadi - Aadi, Madhya or Antya - decided by each person's Janma nakshatra, which scores the Nadi koota at 0 out of 8. This free calculator takes both people's birth details, shows each one's Moon sign and nakshatra, gives the Nadi koota score, names any parihara that cancels it, and rolls the result into the overall 36-point Guna Milan match.
Every person's Janma nakshatra (birth star) places them in one of three Nadis. Nadi carries the highest weight of the eight kootas - up to 8 of the 36 Guna Milan points. When the partners fall in different Nadis the pair earns the full 8 points; when both share the same Nadi the koota scores 0, and that is a Nadi Dosh.
Because Nadi is linked in the texts to health, constitution and progeny (santan), sharing the same Nadi is treated as the most serious mismatch in Ashtakoot. The shastras also record several exceptions (Nadi Dosh parihar) under which the flaw is held to be nullified, and each one restores the full 8 points rather than leaving the koot at 0 with a note attached. This tool applies the stricter reading, so a same-Nadi pair only escapes the dosh when one of them actually holds:
Read the exceptions carefully, because the one most often quoted online is not on this list. 'The two rashi lords are friends' is the parihara for Bhakoot, not for Nadi, and applying it here would clear the heaviest koot in the system on a rule that does not govern it.
Ashtakoot Guna Milan scores eight kootas out of 36 in total: Varna 1, Vashya 2, Tara 3, Yoni 4, Graha Maitri 5, Gana 6, Bhakoot 7 and Nadi 8. Nadi carries the single largest weight, which is the whole reason a same-Nadi pair is worth checking on its own page. Losing it takes 8 points off the top, and the pass mark practice usually sets at 18 out of 36 is then reachable only if most of the remaining seven score well. Note that the total is not always a whole number - Vashya can score 0.5 and Tara 1.5 - so a match may read as 24.5 of 36 rather than 24.
The individual kootas are arbitrated on named verses where the sources supply one, and this app records which: the Vashya classes follow Muhurta Chintamani 6.23 (Rama Daivajna, c. 1600 CE) with the Piyushadhara commentary, and the Yoni bands follow MC 6.25-26. Where no verse settles a cell the result says so instead of presenting an inherited chart as scripture. Both Moon signs and both birth stars are read from two full charts computed to sub-arcsecond precision, using the Lahiri ayanamsha by default, so a Moon near a nakshatra boundary is placed on the correct side of it.
Nadi Dosh occurs when both partners have the same Nadi - Aadi, Madhya or Antya - determined by their birth nakshatra. In Ashtakoot Guna Milan this scores 0 out of 8 and is considered unfavourable, chiefly for health and progeny.
Nadi is the highest-weighted of the eight kootas, worth up to 8 of the 36 total Guna Milan points. Different Nadis earn the full 8, while the same Nadi scores 0 and forms a Nadi Dosh.
No. Classical texts list several exceptions (parihar) that nullify the dosh, and the match is judged on all eight kootas together, not on Nadi alone. Treat a same-Nadi result as a prompt to consult an astrologer, not a final verdict.
This calculator applies three classical pariharas, and each restores the full 8 points: the couple share a birth nakshatra but not a Moon sign; they share a Moon sign but not a birth nakshatra; or they share a birth star that is one of the eight the rule exempts (Rohini, Ardra, Pushya, Magha, Vishakha, Shravana, Uttara Bhadrapada and Revati). A same-Nadi pair with different stars and different Moon signs keeps the dosh, and the same star with the same Moon sign on a non-exempt star is its severest form. The often-quoted 'the rashi lords are friends' rule belongs to Bhakoot, not to Nadi.
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For educational purposes. Astrological interpretations are traditional and not a substitute for professional advice.