You can keep track of your favorite calculations, while you are logged in to ExcelCalcs. Look for the heart symbol just to the right of calculation titles. To make a calculation one of your favorites, click on the heart. It will change from the heart having a white background to having a green background, to indicate it is now one of your favorites. Click again and it will go white, and not be a favorite any more. To see all of your favorite calculations, select My Account - My favorites from the main menu, and see them listed.
You can make a file a favorite by clicking on the heart icon next to the file name