Ashtakoota Guna Milan out of 36 points, from the moon sign and nakshatra of both birth charts.
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Guna Milan compares eight kootas between two janma kundalis. Each koota carries a fixed weight — Varna 1, Vashya 2, Tara 3, Yoni 4, Graha Maitri 5, Gana 6, Bhakoot 7 and Nadi 8 — adding up to 36 points. Traditionally 18 or more is considered acceptable, 21 and above good, and 28 and above excellent.
The score is a summary, not a verdict. Mangal dosha, the running dasha, and the seventh house of both charts matter too, so treat a low score as a reason to look deeper rather than to decide.