Drywall Calculator

Determine 4×8 or 4×12 drywall sheet counts, joint compound mud buckets, screw counts, and tape rolls for walls and ceilings.

Room Length (Ft)

Room Width (Ft)

Ceiling Height (Ft)

Sheet Dimensions

Include Ceiling?

Door & Window Openings (Sq Ft to Deduct) e.g. 2 doors (42 sq ft) + 1 window (15 sq ft) = ~57 sq ft

Drywall Sheets to Order

26 Sheets

774 sq ft (Includes 10% Cutting Waste)

Joint Compound (Mud) 2 Pails 4.5 gal buckets (all-purpose)

Drywall Screws 830 Screws ~32 screws per 4x8 sheet (3 lbs)

Paper Joint Tape 2 Rolls

250-foot paper tape rolls

Recommended Tools & Equipment

Tested hardware and components for high reliability

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How Drywall Materials Are Calculated

Drywall is hung horizontally on walls to span studs and reduce butt joints:

Wall Area = 2 × (Length + Width) × Height - Openings
Ceiling Area = Length × Width
Sheets Needed = (Total Area × 1.10) / Sheet Area

Consumables Benchmark: Plan on 0.05 gallons of joint compound per square foot of drywall (covering 3 coats: tape bed, fill coat, skim coat). Each 4x8 sheet requires ~32 screws spaced 12" apart on ceilings and 16" on walls.

Frequently Asked Questions

Why use 4x12 sheets instead of 4x8 sheets?

4x12 sheets reduce vertical butt joints by up to 33%, creating flatter walls with less taping labor and fewer visible seam humps.

What thickness of drywall is required for ceilings?

Use 1/2" ceiling-sag resistant drywall (like USG Sheetrock UltraLight) for 16" on-center joists, or 5/8" Type X drywall for 24" on-center trusses to prevent sagging.

How many pounds of screws are needed for 30 sheets of drywall?

Standard 1-1/4" coarse-thread drywall screws have approximately 300 screws per pound. 30 sheets need ~960 screws, or approximately 3 to 4 lbs.