Enter the combined length of every wall face being covered. The result is an area-based purchase estimate; a sheet layout is still needed to place joints on framing and reuse offcuts.
01 / Formula
How this is calculated
Sheets = ceiling(((wall length × height − openings) + ceiling area) × (1 + allowance %) ÷ sheet area)02 / Assumptions
What the estimate assumes
- ✓Wall length is the sum of covered wall faces.
- ✓Ceiling dimensions can be zero when excluded.
- ✓One layer is assumed; additional layers must be calculated separately.
03 / Worked example
See the math in context
Forty-four linear ft of 8-ft walls plus a 12 × 10 ft ceiling equals 472 sq ft before openings. With 10% allowance and 4 × 8 sheets, purchase 17 sheets.
04 / Guidance
Make a panel layout
Choose orientation, locate framing, and sketch full sheets and cut pieces. Keep joints away from vulnerable opening corners as required and confirm support at every edge or end that needs it.
05 / Guidance
Check delivery access
Longer sheets can reduce butt joints but are heavier and harder to turn through doors, stairs, and hallways. Verify the route and safe handling plan.
Questions
Frequently asked
Should I subtract every door and window?+
Subtract meaningful openings, but remember that offcuts, joint placement, damage, and whole-sheet layout can offset some theoretical savings. A sheet-by-sheet layout is more dependable than area alone.
Does the calculator select a drywall type or thickness?+
No. Panel type, thickness, layers, orientation, framing spacing, moisture exposure, fire or sound rating, and ceiling use must match current code, tested assemblies, plans, and manufacturer instructions.
What should I verify before ordering?+
Confirm finished dimensions, sheet access and handling, framing and backing, panel orientation, required layers, fastener schedule, control joints, finish level, product coverage, and supplier package units.
Sources