Drywall Calculator
Calculate how many drywall sheets you need with this free online drywall calculator. Includes ceilings, doors, windows, waste, tape, mud and screws.
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How to use Drywall Calculator
- 1Choose feet or metres and the sheet size: 4×8, 4×10 or 4×12
- 2Enter the room length, width and wall height, plus the number of doors and windows
- 3Read the number of sheets, joint tape, joint compound and screws
Frequently asked questions
How many sheets of drywall do I need for a 12×12 room?▾
A 12×12 ft room with 8 ft walls has 384 sq ft of wall and 144 sq ft of ceiling. After a door and a window and 10% waste, that is about 17 sheets of 4×8 drywall.
How much joint compound and tape do I need?▾
A common rule of thumb is about 370 ft of tape and 138 lb of ready-mixed joint compound for every 1,000 sq ft of drywall, which is roughly two to three 4.5-gallon pails.
How much waste should I add for drywall?▾
Add 10% for simple rooms and up to 15% for rooms with many corners, openings or angled ceilings. Longer sheets mean fewer seams but are heavier to handle.
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