How to Estimate Drywall
Measure each wall: length × height. Add all walls together, then add ceiling area if needed. Multiply by 1.1 for 10% waste, then divide by the sheet size (32 sq ft for a standard 4×8 sheet) and round up to the nearest whole sheet.
Example: a 12×10 ft room at 8 ft height with ceiling = wall area 352 + ceiling 120 = 472 sq ft × 1.10 ≈ 519 sq ft ÷ 32 = 17 sheets.