Recite mantras dedicated to the deity of the UL lord.

: Count that same number of houses forward from the lord's position. This final house is your Upapada Lagna. Exceptions to the Rule

If the 2nd house from UL is heavily afflicted by malefics, it indicates a high risk of separation or intense friction unless remedies are applied. Standard Astrological Interpretations for Upapada Lagna Planet in/with UL General Indication for the Marriage / Spouse

To put together a paper or guide on the Upapada Lagna (UL) Calculator

The timing often aligns with when the UL lord is activated in transit or dasa.

: The Upapada Lagna is taken as the 9th house .

The Ultimate Guide to Upapada Lagna Calculators in Vedic Astrology

Spouse will be nurturing, emotional, handsome/beautiful, and family-oriented. (Full Moon brings extreme happiness; Waning Moon may bring mood swings).

Count that same number of signs forward from the position of the 12th lord. The resulting sign is your Upapada Lagna (UL) . Exception Rule (The Jaimini Exception)

Often causes delays in marriage. The spouse may be older, highly disciplined, serious, or strict. It requires patience but can grant a long-lasting, stable bond if well-aspected.

The sign (Aries, Taurus, etc.) of your UL indicates the general atmosphere of your marriage.

The 8th house from the UL indicates the longevity of the marriage. Conclusion

Count how many signs away the 12th lord is from the 12th house (counting inclusively).