In Jainism there isn’t a fixed “karmic count” that an upvas (one-day fast) erases. The tradition teaches that fasting and related austerities reduce karmic bondage by purifying the mind, reducing attachments (raga, dwesha), and strengthening self-control. Over time, repeated or intensified fasting can help shed certain kinds of karmas (especially the karmas that bind through passion and perception), but the exact amount of karma destroyed is not stated as a numeric figure in the canonical texts.

Key points:

• Upvas helps lessen karmic bondage by calming the mind and body and by reducing wrong impulses.
• It is considered a praiseworthy practice that accelerates purification and the shedding of destructive karmas (kashaya-karma) and strengthens right conduct.
• There are differences in emphasis between Digambar and Shwetambar traditions, but both agree that austerities like fasting aid purification.

If you’d like, I can share a brief, traditional explanation of how fasting is seen to affect karma in each tradition (Digambar vs. Shwetambar) with examples from scriptures.