Upvas (उपवास) and Samayik (समायिक) are two different Jain vows and are not fixedly equated to each other.

• Upvas: a day-long fast or partial fasting vow. It is about restricting food and activities for a period (often a full day or a part of the day), and it is one of the Guna-vratas/meritorious vows that households may observe.
• Samayik: a daily practice of equanimity that lasts about 48 minutes (one muhurta) and involves reflection, swadhyaya, and meditation focused on the self. It is one of the Siksha-vratas (disciplinary vows) and is meant to purify the mind, body, and speech.

There is no universal rule in Jain scriptures that states “one Upvas equals N Samayik.” Different traditions (Digambar and Śvetāmbara) emphasize these vows in their own ways, but both recognize them as distinct practices. If you want, I can point you to detailed discussions about each vow from Jain texts and traditions.