drywall costs vary GREATLY from place to place.
measure the LINEAR feet of the room to be drywalled, multiply by ceiling height.
that give you your sq feet of drywall (32 sq feet per 8 foot board, 48 per 12 foot board ----so you can figure out how many sheets you need).
then call your local home builders association and ask what going rate for drywall is your area, they will tell you (or they may have a website with averages)
measure the LINEAR feet of the room to be drywalled, multiply by ceiling height.
that give you your sq feet of drywall (32 sq feet per 8 foot board, 48 per 12 foot board ----so you can figure out how many sheets you need).
then call your local home builders association and ask what going rate for drywall is your area, they will tell you (or they may have a website with averages)