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Drywall Calculator

Find out how many drywall sheets you need.

Room length

Room width

Wall height

Include the ceiling

Enter your room length, width, and wall height to see how many sheets you need.

How this calculation works

This drywall calculator estimates how many sheets you need to finish a room. We find the wall area by adding the length and width, multiplying by two for the perimeter, then by the wall height. Tick the ceiling option to add length × width to the total.

A standard sheet is 4 × 8 feet, or 32 square feet. We add 10% for waste and round up. The cost estimate assumes about $15 per sheet — joint compound, tape, and screws are extra.

For tall rooms, 4 × 12 sheets reduce seams but are heavier to handle. Don't subtract small doors and windows — the extra material covers waste from cuts.

Recommended tools & supplies

Handy products for this project. (Affiliate links — we may earn a commission.)

Drywall T-Square
Mark fast, accurate cut lines across sheets.
Drywall Screw Gun
Drive screws to a consistent depth.
Taping Knife Set
Apply and smooth joint compound cleanly.
Drywall Lift
Hold ceiling sheets in place solo.