Jan 07, 2015 · If you are into the stock or Forex market investment, you might have often heard about the term compound interest or using the compound interest calculator to get an idea of your net savings. In case you are baffled about how exactly to calculate the complex interest structure, here is your easy guide for dealing with this unique approach to interest calculation and how it can work towards If a trader made a 1 percent return every trading day on ... Wikipedia says there are 252 trading days per year. 1% return each day means that for every 1 unit you have, you have 1.01 after a day’s trading. Do that 252 times and for every 1 unit you start the year with, you’ll have 1.01^252, or 12.274. If you start with $100,000, you’d finish with 1,227,400.