Cash Flow Analyzer iPhone App

I have an program for real estate investors to figure out cash flow of a property on the fly. Originally, it was a spreadsheet based program, but had it developed into a Visual Basic program for Windows based computers. I would like to adapt the program to iPhone/iPad application and potentially an Android application (although iPhone /iPad takes preference at this point). Program is not complex. Consists of spreadsheet type calculations/inputs, an amortization table, and an interest rate table. I can provide all calculations and the original program that is to be converted so that the programmer has a template to work off of.