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Drywall sheet calculator
Sheets to cover an area, waste included — works for drywall, OSB, plywood sheathing, or subfloor; just set the sheet size.
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How it’s computed
Sheets = ceil(area × (1 + waste) ÷ sheet size). Defaults: 4×8 sheet (32 sqft) and 10% waste.
Decimal-exact and deterministic: identical inputs always return identical results. This is the same math Ask Donnie’s estimating engine runs — not an approximation, and never a language model doing arithmetic.
Common questions
I hang 4×12 sheets.
Set sheet_sqft to your sheet's real face area — 48 for a 4×12 sheet, 54 for a 54-inch-wide × 12-ft board. The formula is the same.
Is 10% waste enough?
It's the common planning default this calculator ships with. Rooms with many corners, angles, or openings cut more — raise the waste input to match your layout.
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