Estimate 4×8 drywall sheets for a room plus the mud, tape and screws to hang and finish it.
We add up the wall and (optional) ceiling area and divide by 32 sq ft — the area of one 4×8 sheet — rounding up. Finishing materials scale with total area.
We don't deduct for doors and windows — the offcuts around openings usually go to waste, so counting them as full wall keeps you covered. Buy a spare sheet for repairs and closet backs.
A standard 4×8 sheet is 32 square feet. The common 4×12 sheet is 48 square feet and means fewer butt joints on long walls, but it is heavier and harder to handle solo.
The cut-offs around openings are usually too small to reuse, so they end up as waste. Counting openings as full wall area builds that waste in and keeps you from coming up a sheet short.
Plan on roughly 54 pounds of ready-mix per 100 square feet of drywall across taping and finish coats. A textured or level-5 finish uses more, so buy an extra bucket if you\u2019re skim-coating.
Half-inch is standard for walls. Use 5/8-inch fire-rated board on garage-to-house walls and where code requires it, and moisture-resistant or cement board in wet areas like showers.
The Home Renovation Project Manager rolls every calculator into one budget — room by room, with a shopping list, contractor quote comparison and a live over-budget warning.