The FGI Panel Weight Calculator is a spreadsheet that calculates the surface area of a containment basin and then the number of factory fabricated flexible geomembrane panels that are required to cover or line the bottom of the basin. Afterwards, the spreadsheet calculates the weight of each panel based on the type of geomembrane selected, which can be varied. Using the number of panels required, the number of truck loads and days for field installation are calculated based on user selected allowable shipping weight/truck and number of panels that can be installed/day. The Calculator allows the user to input and vary the size of the containment basin, including length, width, depth, side slope angle, and freeboard. Using this data, the spreadsheet calculates the volume of the basin in gallons or liters and the surface area required to be covered or lined.