Drywall Material Calculator
Calculate drywall sheets, joint compound, tape, and screws needed for your project. Accounts for doors, windows, and includes 10% waste factor.
Enter Room Dimensions
Length of the room
Width of the room
Standard: 8 ft, 9 ft, or 10 ft
Match sheet length to ceiling height when possible
Openings & Pricing
Standard door opening: 21 sq ft
Standard window opening: 15 sq ft
1/2" drywall: $12-18 per sheet
Average: $2-4 per sq ft (hang + finish)
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Enter Your Room Dimensions
Fill in the length, width, and ceiling height on the left to calculate your drywall needs.
How to Use This Calculator
Formula Explained
The calculator uses the following method:
Total Area = 2(Length × Height) + 2(Width × Height)
Net Area = Total Area - Doors - Windows
Sheets = (Net Area / Sheet Size) × 1.10
Net Area = Total Area - Doors - Windows
Sheets = (Net Area / Sheet Size) × 1.10
- • Calculates all 4 walls of the room
- • Subtracts door openings (21 sq ft each)
- • Subtracts window openings (15 sq ft each)
- • Adds 10% waste factor for cuts and mistakes
- • Joint compound: 1 gallon covers ~100 sq ft (3 coats)
- • Screws: 32 screws per sheet, 150 screws per pound
Sheet Size Selection
8-ft CeilingsUse 4×8 sheets
9-ft CeilingsUse 4×10 sheets
10-ft+ CeilingsUse 4×12 sheets
Drywall Thickness Guide
1/4 inchCurved surfaces, repairs
3/8 inchExisting walls, double layer
1/2 inchStandard walls & ceilings
5/8 inchFire-rated, soundproof