iFxCalc is a very delicate calculator that will greatly increase your calculation effectiveness. In addition to traditional calculator's computing features, it offers more possibility and
flexibility to calculation
This app allows you to define your own functions. So you can input expression like this:
Law_of_gravity (60, 70, 1.5)*10^7
FV(1000, 10%, 5) - 1000, etc.
You can define those complex, long or frequently used calculations as functions. Next time you can recall them conveniently. Also, you can reuse previous calculations' result or whole expression