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Drywall Calculator

Calculate how many drywall sheets you need for walls and ceilings, including a waste allowance for cuts and mistakes.

Room Dimensions

m
m
m

Typical wall height is 2.4–3 m

Standard drywall sheet is 1.2 Ă— 2.4 m (4 Ă— 8 ft equivalent)

Installation Tips

  • •4Ă—12 sheets reduce seams but are harder to maneuver
  • •½ inch thickness is standard for walls, â…ť inch for ceilings
  • •Use 13 mm (½") drywall for walls; 16 mm (5/8") for fire-rated assemblies
  • •Don't forget screws (1 lb per 5 sheets) and corner bead

Ready to Calculate

Enter your room dimensions to get drywall estimates

How the Calculation Works

Drywall estimation accounts for room area minus openings:

  1. Calculate wall area (perimeter Ă— height) and ceiling area
  2. Calculate wall area in square meters, subtract openings
  3. Divide by sheet size (32 sq ft for 4Ă—8, 48 sq ft for 4Ă—12)
  4. Add 10-15% waste factor for cuts and mistakes
  5. Add waste factor and round up to nearest full sheet

Sheet Size Recommendations

  • 4Ă—8 (1.2Ă—2.4m): Standard size, easiest to handle, works for most rooms
  • 4Ă—10 (1.2Ă—3m): Good for high ceilings (10 ft), reduces horizontal seams
  • 4Ă—12 (1.2Ă—3.7m): Best for 12 ft ceilings and open-plan spaces, fewer joints