Answer

As per the latest official Census data available, India had 4,451,753 Jains — about 44.5 lakh — in Census 2011. India’s total population in that census was 1,210,854,977, so Jains were about 0.37% of the population. ( pib.gov.in)

Explanation

This is the most widely used official figure because India’s last completed Census was in 2011. There has not been a newer official census count released for religion-based population figures yet. ( pib.gov.in)

Takeaway

So, in simple terms: Jain population in India is about 44.5 lakh, or 0.37%, based on Census 2011. ( pib.gov.in)