Drywall Calculator
Estimate sheets for walls and ceilings. Enter total area or room dimensions, pick a sheet size, and add waste — optional rough joint-compound estimate included.
Results
—sheets
Net area
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With waste
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Sheet coverage
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Joint compound (rough)
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Assumptions: Sheet count is rounded up. Joint compound is a rough planning estimate (~1 bag per 100 sq ft of board) — labeled rough; actual mud depends on seam length and finish level. Deduct openings carefully if you already measured net area.
Drywall calculator FAQ
How many drywall sheets do I need?
Divide total area by sheet size (4×8 = 32 sq ft, 4×10 = 40, 4×12 = 48), add waste, and round up.
What waste factor should I use for drywall?
10–15% is common with many cuts. Simpler rooms may need 5–10%. Default is 10%.
Should I hang 4×8 or larger sheets?
Larger sheets mean fewer seams but are heavier. Match length to stud height when you can.
How much joint compound do I need?
It varies. The bag figure here is rough (~1 bag per ~100 sq ft of board) — confirm with your product and finish level.
Step-by-step guide: How many drywall sheets do I need? — formula, worked examples, and common mistakes.