Interest Calculator

In this JavaScript example, you can find out just how much that new house or car is going to cost you each month. Enter values in the fields below to find out how much each monthly payment would be with the given number of payments, interest rate, and amount of the loan.

# of
Payments
Interest
Rate
Principal
Monthly
Payment
You can use the Document Source function in the View menu to look at the source of this HTML document. In the source, you'll see various math and formatting functions using the JavaScript language.