* Principal   * # of Mortgage Year  
* Mandatory fields
# Generated figures

User Guide
1. The tool tries to show you how different "mortgage interest rate (US real history mortgage rate)" would change the cost of the loan (total interest paid) by the given Principal amount and number of years of loan standing. It clearly reflects one fact that low interest rates can significantly reduce the cost of loan
2. Freddie Mac publish history rate for 5 | 15 | 30 years publicly. Select different "# of Mortgage Year" options to see the historical rates in the diagram. It has been used in the calculation
3. The calculation will show you the Cost of Loan (Total Interest Paid) with the given Principal Amount you provided and the history mortgage rate you selected
4. Either hit "Enter" after input by the keyboard or hit the "Button" will trigger the re-calculation
5. Move mouse over (in laptop) or press (in touch screen) the bars in the diagram will bring you more detail information about each of the bar