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Drywall & Walls

Drywall is sold in whole sheets with a fixed coverage, so the estimate has two steps: total the wall area you plan to cover, then divide by the sheet and round up — with a waste allowance for cuts, odd rooms, and offcuts.

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What you can calculate

  • Sheets needed for one room from its dimensions, or for a whole floor plan from a known wall area.
  • Any sheet size — the common 4 × 8, 4 × 10, and 4 × 12 ft sizes (or their metric equivalents), plus custom dimensions.
  • Ceiling coverage when you are boarding the ceiling as well as the walls.
  • Estimated cost from your own price per sheet, using the actual rounded-up sheet count.

Common sheet sizes and coverage

Sheet (US)Sheet (metric)Coverage
4 × 8 ft1.2 × 2.4 m32 sq ft ≈ 2.97 m²
4 × 10 ft1.2 × 3.0 m40 sq ft ≈ 3.72 m²
4 × 12 ft1.2 × 3.6 m48 sq ft ≈ 4.46 m²

Longer sheets mean fewer seams and faster hanging on long walls, but they need hallways and rooms wide enough to maneuver. 4 × 8 ft is the easiest size to handle alone.

Measuring tips for drywall

  • Measure wall length at floor level and height from floor to ceiling; for sloped or knee walls, measure each section separately and add the areas.
  • Use the door and window count fields with their editable sizes — the defaults are common sizes, but your openings may differ.
  • For rooms where a full sheet does not fit between floor and ceiling, waste goes up; raise the percentage rather than rounding it away.
  • Boarding a garage or addition with a known area? Use total-area mode and enter the take-off directly.

This calculator estimates material quantities only. Stud spacing, fire ratings, moisture-resistant or type-X board requirements, and structural questions need your local building code and a qualified professional.

Guides for drywall projects

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