In Jainism, "ekasana" refers to a practice of eating only once in a day, sitting in one place, and consuming a simple meal without indulging in taste or excess. "Biyasana" refers to eating twice in a day.

The question of equivalence between ekasana and biyasana is not about a numerical conversion but rather about the severity of the vow (vrata) or the level of austerity (tapas).

• Ekasana: Eating once a day (higher austerity)
• Biyasana: Eating twice a day (lower austerity compared to ekasana)

There is no direct numerical conversion like "1 ekasana = X biyasana." Instead, Jain texts and practices consider ekasana a stricter or more advanced form of discipline compared to biyasana. Some Jain monks, nuns, or laypeople take vows to practice ekasana for spiritual benefit, while biyasana is considered a step below in terms of restraint.

Summary: There is no mathematical equivalence; ekasana is simply a greater austerity than biyasana. Both are practices to reduce attachment to food and develop self-control as per Jain principles of non-possessiveness (aparigraha) and self-restraint (samyama).