How do I calculate how much drywall I need?

Calculate total wall and ceiling square footage, subtract for doors and windows, then divide by 32 (for 4×8 sheets). Add 10% for waste and round up.

What size drywall sheets should I buy?

4×8 sheets are easiest to handle alone. 4×12 sheets require fewer seams and less taping but need two people to install. Use 12-foot sheets for 9-foot ceilings.

What thickness drywall for walls vs. ceilings?

1/2" drywall is standard for walls. Use 5/8" Type X for garage walls, ceilings, and fire-rated assemblies. Use 3/8" only for curved surfaces.

How many drywall screws do I need?

Plan for one screw per square foot of drywall, roughly 28-32 screws per 4×8 sheet for walls with 16" stud spacing.

How much joint compound do I need for drywall?

Plan for one gallon of joint compound per 100 square feet of drywall for three coats of finishing. Pre-mixed compound is easier for beginners.

Drywall Calculator – DIY Calculators — Free Home Improvement Tools

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Quick Answer

To calculate drywall sheets needed, add up all wall and ceiling square footage (minus door and window openings), divide by 32 for 4×8 sheets, and add 10% for waste and damage. Always round up to whole sheets — partial sheets cannot be returned.

Calculate drywall sheets, joint compound, and tape needed for any room.

Room Length (feet) Room Width (feet) Ceiling Height (feet) Number of Doors Number of Windows Include Ceiling?

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Cite This Tool

Drywall Calculator. (2026). DIY Calculators Online. Retrieved from https://diycalculator.net/drywall-calculator/

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