Interest Payment Calculator is an online interest prediction tool to calculate how much monthly interest you will have to pay for the borrowed money from the financial institution. This monthly interest value you have to pay for each month will be calculated based on the inputs of total money borrowed and the annual interest rate. It is always advisable to determine what monthly interest payment you can be easily afford when you purchase a loan. Interest payment calculator allows you to easily compare the monthly interest instalments for varying rates of interest and loan principal