Scenario 1: Find the Monthly Payment | |
Interest rate R% is always a yearly figure. However, in most loan situations it is compounded monthly. In this calculator the monthly payment is calculated by the following formula where r = R/1200: |
Scenario 2: Find the Interest Rate | |
For given C, P and N, one can only solve the following equation for r by numerical means. Given the rather smooth behavior of this equation, this calculator employs the Newton-Raphson method with an educated initial guess: |
Scenario 3: Find the Number of Payments | |
This calculator figures out the number of months N by the following closed-form expression: Notice that N has to be an integer, so the monthly payment P might be slightly adjusted to satisfy this condition. |