Drywall Calculator
Turn room dimensions into a drywall takeoff with sheets, screw pounds, joint compound and tape, plus formulas and source-backed finishing allowances.
Drywall wall measurements
See how room length, room width and full floor-to-ceiling wall height define the wall area used for the drywall estimate.
Start with the essentials
Enter the room dimensions first. Openings, sheet size and waste can be refined below.
CUSTOMIZE PROJECT DETAILSAdjust assumptions & product details+
Check the method or common questions
Method, formula & assumptions
Interior material estimating
Formula: Wall area is calculated from room perimeter and wall height. Paint then multiplies that area by the number of coats and divides by your entered coverage rate; drywall converts wall area into sheet quantities.
Worked example: Example: a 10 × 12 ft room with 8 ft walls has 352 ft² of gross wall area before multiplying by paint coats.
Before you buy: Doors, windows, texture, porosity and application method affect actual coverage. Using gross wall area is a simple way to preserve a practical allowance on many projects.
Drywall Calculator FAQ
Should I subtract doors and windows?
For a quick estimate, leaving small openings in the gross area can provide useful extra material. Large openings can be subtracted for a tighter estimate.
Why enter paint coverage myself?
Coverage varies by paint and surface. The number printed by the manufacturer is more useful than assuming one universal rate.
Continue your Walls & Finishes project
Use the Walls & Finishes planning hub for related calculators and quick-reference guides.
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