Drywall Sheet Calculator
Estimate drywall sheets needed for any wall or ceiling area.
Sheets Needed: —
Drywall FAQ
What size is a standard drywall sheet?
4×8 ft (32 sq ft) is most common. 4×12 ft sheets are used for taller walls.
How much waste should I add?
10% is standard; 15% for rooms with many cuts.
Results are estimates for planning purposes. Verify with product labels and local requirements before purchasing materials.
How to calculate drywall sheets
Measure total wall and ceiling area in square feet. Divide by your sheet size and apply a waste factor. Always round up — you cannot order a fraction of a sheet.
| Room size | Wall height | Approx wall area | 4×8 sheets (10% waste) |
|---|---|---|---|
| 10×10 ft | 8 ft | 272 sq ft | 10 |
| 12×12 ft | 8 ft | 320 sq ft | 12 |
| 12×15 ft | 8 ft | 368 sq ft | 13 |
| 15×20 ft | 9 ft | 504 sq ft | 18 |
To include the ceiling, add room length × width to your total area.
Drywall installation tips
- Hang drywall horizontally — fewer seams, stronger result.
- Use 4×12 sheets for 9 ft or taller ceilings to eliminate horizontal butt joints.
- Stagger joints between rows so vertical seams do not line up.
- Screw every 12 inches on studs, 16 inches on ceiling joists.
- Leave a 1/4 inch gap at the floor — covered by baseboard.
Frequently asked questions
How many sheets of drywall do I need for a 12x12 room?
A 12×12 ft room with 8 ft ceilings has about 320 sq ft of wall area. At 32 sq ft per 4×8 sheet with 10% waste, you need about 11 sheets for walls plus 5 sheets for the ceiling.
What thickness of drywall should I use?
1/2 inch for most interior walls and ceilings. 5/8 inch for fire-rated walls and between garage and living space. 3/8 inch for curved walls.
Should I use moisture-resistant drywall in bathrooms?
Yes — green board for bathroom walls. For shower areas, use cement board instead of drywall.
How much waste factor should I add for drywall?
10% for simple rooms. 15% for rooms with many cuts, corners, or angles. Always round up to the nearest full sheet.
Can I hang drywall vertically?
Yes, but horizontal hanging is preferred — it creates fewer seams, is stronger, and aligns better with standard framing.
Related tools
- Square Footage Calculator — calculate your room area first
- Paint Coverage Calculator — estimate paint after drywall
- Tile Calculator — estimate tile for floors and walls
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