Auto Loan Calculator for WordPress: SideBar Widget

Administrative features:
- Title is inserted by admin
- Interest rate is inserted by admin (and can be changed by user)
User features:
- On load, shows only 2 buttons: new or used auto loan
- User chooses either new or used auto loan and calculator opens
- Validates that only numbers are inserted by user
- User inserts purchase amount, down payment, changes interest rate if necessary and selects number of months of loan from a drop down.
- Calculates loan payment
Download
Download Auto Loan Calculator

Or customize widget and add to your site as a Google Gadget:
Or customize widget and add to your site as a Widgetbox: