Drywall, also called sheetrock or gypsum board, is the standard interior wall and ceiling material. This calculator estimates sheets needed plus screws and joint compound for finishing.
Standard sheets are 4x8 feet (32 sq ft) and come in 1/4, 3/8, 1/2, and 5/8 inch thicknesses. Use 1/2 inch for walls and 5/8 inch for ceilings. Longer 4x12 sheets reduce seams but are harder to handle. Always add 15% waste for cuts around doors, windows, and electrical boxes.
Each sheet requires 30-40 screws placed 12 inches apart on studs. Use 1-1/4 inch screws for 1/2 inch drywall, 1-5/8 inch for 5/8 inch. Drive screws slightly below surface without breaking paper. Expect 1 gallon of joint compound per 100 square feet of drywall for all coats.
Hanging drywall is a two-person job for safety and ease. Start with ceilings, then walls, positioning seams over studs. Stagger seams between rows. Finishing requires 3 coats of mud, sanding between coats for professional results.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
1/2 inch for walls, 5/8 inch for ceilings. Use 5/8 inch for fire-rated walls.
4x12 reduces seams but is harder to handle. 4x8 is easier for DIY.
Three coats minimum: tape coat, fill coat, and finish coat. Sand between each.
Walls yes with a lift, but ceilings require two people for safety.
Screws hold better and don't pop out over time. Use coarse thread for wood studs.