How do we know and follow various opinions of scholars or schools of jurisprudence (Madhahib) in calculating Zakat?
Indeed there are differences of opinion concerning the definitions of Nisab and the treatment of different categories of wealth. For the sake of providing a comprehensive tool, we have adopted those opinions, which are generally accepted by various scholars, or are easier to apply. However, other major differing opinions are also mentioned in the various answers given under frequently asked questions (FAQs) and the individual is free to follow other opinions if more appealing to him/her. For a greater in depth understanding, of course, one can access many books available on Zakat.