Should I use 1/2 inch or 5/8 inch drywall?

1/2-inch drywall is standard for walls with 16-inch stud spacing. Use 5/8-inch for ceilings (resists sagging), fire-rated applications (garages, furnace rooms), and areas requiring better soundproofing. Check local codes for requirements.

How much joint compound do I need?

Plan for about 1 gallon of premixed joint compound per 100 square feet of drywall for finishing all joints and screw holes. A 12x12 room typically needs 4-5 gallons for three coats. Heavy texturing requires additional compound.

How much drywall tape do I need?

Estimate one 500-foot roll of paper tape per 1,000 square feet of drywall installed. For a typical room, one roll is usually sufficient. Include extra for corners and any mistakes. Mesh tape is easier for DIYers but paper tape is stronger.

Should I hang drywall horizontally or vertically?

Hang drywall horizontally on walls - this creates stronger joints at stud locations and fewer joints to finish at eye level. Hang ceiling drywall perpendicular to joists for maximum support. Always stagger joints between sheets.

How many drywall screws do I need?

Use approximately 32 screws per 4x8 sheet of drywall. Screws should be placed every 12 inches along edges and 16 inches in the field. A 5-pound box of screws (about 700 screws) covers roughly 20-22 sheets.

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Drywall Calculator

Calculate drywall sheets, mud, and tape for any room

0 calculations

Last verified: February 2026Accuracy tested

Calculated in your browser — we never store your dataIncludes standard waste factors

Room Length (ft)

Room Width (ft)

Wall Height (ft)

Include Ceiling

Price per 4×8 Sheet ($)

● National avg · updated Feb 20

Calculation Result

14 sheets (4×8)

2 roll(s) of tape

~25 lbs joint compound

Estimated sheet cost: $210

~10% deducted for doors/windows

Sources & Methodology

Formula: Sheets = (Wall Area - Openings) / 32 sq ft

Standard 4×8 drywall sheets

Source: Standard construction material estimation

View full methodology & accuracy testing

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Estimate Your Project Cost

See drywall project costs including hanging and finishing →

Drywall Installation Cost Guide on CostOnce.com

How to Use the Drywall Calculator

Estimate the number of drywall sheets, joint compound, and tape needed for your room. Perfect for renovation projects, new construction, or finishing a basement. First, measure your space with our square footage calculator for accurate dimensions.

Standard Calculations

We calculate based on 4×8 foot sheets (32 square feet each) and automatically deduct 10% for doors and windows. Joint compound is estimated at approximately 5 pounds per 100 square feet, and tape at one roll per 7 sheets.

Ceiling Considerations

Toggle the ceiling option to include ceiling drywall in your estimate. Ceilings often require 5/8" drywall (vs. 1/2" for walls) for better sag resistance, especially with textured finishes.

Installation Tips

Hang ceilings first, then walls
Stagger seams for stronger joints
Consider moisture-resistant drywall for bathrooms
Fire-rated drywall may be required near garages and furnaces

Complete Your Wall Project

After hanging drywall, you'll need to calculate paint for finishing. Don't forget insulation before closing up walls, and use our lumber calculator for framing materials.

Frequently Asked Questions

Calculate wall area (perimeter x height) plus ceiling if applicable, then divide by 32 (square feet per 4x8 sheet). A 12x12 room with 8-foot ceilings needs about (48 x 8) / 32 = 12 sheets for walls, plus 4.5 sheets for the ceiling, totaling approximately 17 sheets.