Drywall sheet calculator

Formulas

• Gross wall area = (W1+W2+W3+W4) × wall_height
• Ceiling area = ceiling_length × ceiling_width (only when Include ceiling is checked)
• Openings deduction = doors × 21 sf + windows × 15 sf (standard 3×7 door, typical residential window)
• Net area = max(wall + ceiling − deductions, 0)
• Sheets = ceil(net_area × (1 + waste) / sheet_sf)
• Screws = sheets × (32 for 4×8, 40 for 4×10, 48 for 4×12) (16" OC framing: 8 perimeter + 24 field on a 4×8)
• Tape = 370 LF per 1,000 sf of net area × (1000 sf) (USG/NGC typical for Level 3)
• Joint compound = 0.053 gal/sf × net_area (USG readymix Level 3 baseline, ~3 coats)
• Corner bead = override if > 0, else 8 × wall_height (8 outside corners assumed)

Sources & references

• USG Sheetrock Brand joint compound coverage tables (0.05–0.06 gal/sf for Level 3).
• Gypsum Association GA-216 fastener spacing for 16" OC framing.
• Standard 21 sf deduction for a 3×7 interior door; 15 sf for a mid-size window is a conservative average.

What this does NOT account for

• Gable ends, soffits, bulkheads, furred walls, or shaft wall assemblies.
• Fire-rated or moisture-resistant board upgrades (multiply compound & labor accordingly).
• Control joints, L-bead, J-bead, or tear-away bead.
• Access panel framing and patch material.