How do I calculate ceiling drywall?
Ceiling area = room length × room width. Add that to wall area (2 × height × (length + width)), subtract openings, add waste, then divide by sheet size.
Drywall for Ceiling Calculator
Ceiling drywall adds a flat rectangle (length × width) on top of your wall area. Hanging ceiling boards is slower and cut-heavy — this calculator includes both surfaces so one trip to the store covers the room.
Rooms
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Project settings
Default 4×8 ft (32 sq ft)
Default 10% for cuts and mistakes
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Ceiling area math
Ceiling sq ft = room length × room width. A 14×16 great room adds 224 sq ft on top of wall area. Toggle "walls + ceiling" or use this page with ceiling included by default.
For wall-only estimates, use the main drywall calculator and leave ceiling off.
Thickness and fire code
1/2 inch gypsum is common on residential ceilings. Garages, party walls, and some jurisdictions require 5/8 inch Type X for fire rating — sheet count math is identical regardless of thickness.
Extra waste for ceilings
Recessed lights, fan boxes, and soffits add cutouts. Start with 10% waste; bump to 12–15% if you have more than four ceiling penetrations or angled tray ceilings.
Frequently asked questions
Is ceiling drywall the same thickness as walls?
Often yes — 1/2 inch is common for both. Some codes require 5/8 inch on ceilings for fire rating. Sheet count math is the same regardless of thickness.
Do I need more waste for ceilings?
Ceiling cuts around fixtures and light boxes can add waste. Start with 10% and increase to 12–15% if you have many recessed lights or soffits.
Related calculators
Drywall Calculator · https://drywall-calculator.com/drywall-for-ceiling-calculator/