Here's how you use this cost estimator: 1.First, you select the type of calculation you want to perform in the 'Calculation Type' drop-down. 2.Then, enter the requested variable(s). 3.Then, click the 'Calculate' button, or click Clear to reset back to the orginal page. If you ever need to see this help again, just go back to the top option in the 'Calculation Type' box.