Drywall Calculator

Calculate drywall sheets needed for any room.

Room Length (ft)

Room Width (ft)

Ceiling Height (ft)

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Guides & Reference

How It Works

Calculates 4x8 sheets needed: wall area = 2x(length+width)x height / 32 sq ft per sheet. Add 10% waste.

Formula

Sheets = Wall Area / 32

Common calculations — results you can verify instantly.

12×15 room, 8ft ceiling

432 sq ft / 32

13.5 → 15 sheets

4×8 sheet coverage

32 sq ft per sheet

Standard size

Add 10% waste

15 sheets + 10%

Order 17 sheets

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Order 10-12% extra for waste.

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Ceiling: 5/8 inch Type X. Walls: 1/2 inch standard.

Not subtracting doors and windows

Each door saves ~20 sq ft. Each window saves ~10-15 sq ft.

Same drywall for walls and ceilings

Ceilings need 5/8 inch for sag resistance and fire rating.

2(12+15)x8=432 sq ft / 32=13.5 sheets + 10% = ~15 sheets.

1/2 inch walls. 5/8 inch ceilings and fire-rated walls.

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