How many sheets of drywall do I need for a 12x12 room?

A 12×12 room with 8 ft ceilings has approximately 384 sq ft of walls and 144 sq ft of ceiling — 528 sq ft total. At 32 sq ft per 4×8 sheet with 10% waste, you would need approximately 18–19 sheets.

What thickness of drywall should I use for walls vs. ceilings?

Standard 1/2-inch drywall is used for interior walls. Ceilings typically use 5/8-inch drywall for better sag resistance and fire rating. Moisture-prone areas like bathrooms use moisture-resistant green board or cement backer board.

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🛠️ Construction & DIY

Drywall Sheet Estimator

Estimate the number of 4×8 drywall sheets needed for rooms based on wall and ceiling area.

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drywall sheetrock 4x8 walls ceiling construction

Room Length (ft)

Room Width (ft)

Ceiling Height (ft)

Sheet Size

Include Ceiling

Include 10% Waste Buffer

Drywall: Estimating Sheets for Any Room

Standard drywall (Sheetrock) comes in 4×8 sheets (32 ft²) and 4×12 sheets (48 ft²). Most contractors calculate total surface area (walls + ceiling) and divide by the sheet size, then add 10% for waste from cuts and doorways.

Drywall Calculation Formula

Wall Area = 2 × (Length + Width) × Height

Ceiling Area = Length × Width

Sheets = (Total Area × 1.10) ÷ 32 ft² per sheet

Drywall Thickness Guide

Standard walls use 1/2" drywall. Ceilings use 5/8" drywall for fire resistance. Curved walls use 1/4" flexible drywall. Bathrooms near moisture should use moisture-resistant "green board" or cement board.

Drywall Sheet Estimator

Sheets of Drywall Needed

Drywall: Estimating Sheets for Any Room

Drywall Calculation Formula

Drywall Thickness Guide