Home Equity Line Of Credit - Version 1 This calculator is extremely easy to use. It's also very easy to install. It will run on any existing version of Windows and is also been optimized to run on older computers to give the widest possible compatibility. All you have to do to use the calculator is input your loan amount, number of years and the interest rate. You will then be able to assess exactly what you're repayment schedule will be over the full term of your loan.