Add up the walls, include any ceiling, and pick the sheet size. You get a sheet count with 10% for cuts, plus mud and tape to go with it.
How it works
Wall length × height plus ceiling area, raised 10%, divided by sheet area. Compound and tape scale at about 9 gal and 370 ft per 1,000 sq ft of board.
Before you order
- Longer sheets mean fewer butt joints, if you can get them through the door and up the stairs.
- Hang ceilings first so wall sheets support the edges.
- Check that delivery can reach your room, since sheets can't bend around tight stairs.
Common questions
Should I subtract windows and doors?
Most hangers don't. You run sheets across openings and cut them out, and the offcuts rarely fit elsewhere.
What thickness do I need?
Half inch is common on walls. Ceilings on wider framing and fire-rated walls may call for 5/8 in, so check your local code.