Drywall Calculator
Calculate how many drywall sheets you need for walls and ceilings. Get accurate estimates for any room size.
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Drywall Tips
Standard drywall sheets are 4 feet wide. 8-foot sheets are common for standard 8-foot ceilings. Order 10% extra for cuts and waste.
- Use 1/2 inch drywall for walls, 5/8 inch for ceilings
- Don't forget joint compound, tape, screws, and corner beads
- Stagger joints between rows for stronger walls
How to Calculate It Yourself
If you prefer to check the math by hand, follow these steps:
- Wall area = 2 x (length + width) x height.
- Ceiling area = length x width.
- Total area = wall area + ceiling area.
- Sheets = total area / sheet square footage (32, 40, or 48).
- Round up and add 10% for waste.
Worked Example
A 12 x 10 ft room with 8 ft ceilings: walls = 2 x 22 x 8 = 352 sq ft, ceiling = 120 sq ft, total = 472 sq ft. At 32 sq ft per 4x8 sheet, that's ~15 sheets; add 10% and order 17.
Approximate Material Costs
Prices vary by region and supplier. These are rough US averages to help with budgeting.
| Item | Estimate | Notes |
|---|---|---|
| 4x8 drywall sheet | $12 - $16 | 1/2 in standard |
| Drywall screws (1 lb) | $8 - $12 | About 100 screws |
| Joint compound (bucket) | $15 - $30 | Covers ~400 sq ft |
| Drywall tape (250 ft) | $12 - $18 | For seams |
Frequently Asked Questions
How many drywall sheets do I need for a 12x12 room?
A 12x12 room with 8-foot ceilings has approximately 384 sq ft of wall area plus 144 sq ft of ceiling, totaling 528 sq ft. Using 4x8 sheets (32 sq ft each), you need about 17 sheets.
What size drywall should I use?
1/2-inch drywall is standard for walls. Use 5/8-inch for ceilings, garage walls, and fire-rated assemblies. 1/4-inch drywall is used for curved walls and remodeling over existing surfaces.
How much does a sheet of drywall weigh?
A 4x8 sheet of 1/2-inch drywall weighs approximately 54 pounds. A 4x8 sheet of 5/8-inch drywall weighs about 70 pounds. Larger sheets (4x10, 4x12) are heavier and require multiple people to install.
Should I hang drywall horizontally or vertically?
Horizontal hanging is standard for walls because it reduces the number of joints and makes finishing easier. Vertical hanging is used for narrow walls and when using 10-12 foot sheets.