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Square footage of the room = 500 sqft suppose you are using 8x4 size panel Drywall panel = 500/32= 15.6 add 10% extra for wastage You will need 18 drywall Panels
Square footage of the room = 560 sqft suppose you are using 8x4 size panel Drywall panel = 560/32= 17.5 add 10% extra for wastage You will need 20 drywall Panels
Square footage of the room = 800 sqft suppose you are using 10x4 size panel Drywall panel = 800/40= 20 add 10% extra for wastage You will need 22 drywall Panels