This calculator is not for the average person. In fact, unless you are in statistics or some kind of scientific/medical profession, you won't even need a calculator like this. However, if you fall into one of those areas, then this is the perfect calculator for you. It has two different variations depending on if you are looking in portrait or landscape mode. Each mode has different functions for the user. Honestly, I could sit here and tell you all about the different functions, but they would fly right over your head unless you have experience in these professional or academic areas. Honestly, this is the best app you can have if you are looking for something like this.