ashtakoot · varna koota
Shudra Varna in Guna Milan: Against Every Other Varna
Shudra belongs to the Moon signs Gemini, Libra and Aquarius: a Moon there brings Shudra to the Varna koota, which is worth 1 of the 36 guna. Across the 11,664 pairings, 5,103 involve Shudra on at least one side; 42.9% of those score nothing on Varna and 57.1% score the full 1, and their totals average 19.41.
Scores are Varna guna out of 1; a range means lineages grade that case differently. Shudra scores nothing against Kshatriya, Vaishya and Brahmin. The table is not symmetric: with Kshatriya, Vaishya and Brahmin it matters whether Shudra is the bride’s or the groom’s, because Varna is scored in one direction.
Whether your pairing brings Shudra to the Varna koota depends on the Moon's position at each birth. The Free Kundli Matching tool gives the eight koota scores and the total, which is the headline answer; the Kundali Milan detailed report works the same arithmetic further from your own birth details, and its page lists what it contains.
The rest of the Varna koota is on the Varna page. For the method, the 36 gunas explained and the kundli milan guide. In Hindi: शूद्र वर्ण.