In the good olden days, people used to do their calculations by using pen and paper. Today those days are gone. Advancement in Modern technology has made paper and pen obsolete. The modern-day mobile phone has become a multipurpose gadget. So today, all simple, as well as complex financial calculations, can be done on the mobile phone and a track of it too can be maintained. Today with rising in small scale businesses, it gave rise to the financial calculator. What is the financial Calculator? It is an electronic calculator which performs financial functions such as calculation of simple and compound interest, cash flow, amortization, conversion, cost & sale margin, etc. These type of functions are generally needed in the business and commerce sectors. Hence the term financial calculator. There are many accounting and finance calculators available online but this is one of my favorite apps for mobile.