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Estimate paint needed for a known wall area.
Calculators / Construction / Drywall sheets
Drywall sheets calculator
Estimate drywall sheets for walls after openings and waste.
On this page
Net wall area42.6m²
Area including waste46.86m²
Sheets required17sheets
Calculator controls
How to calculate
Estimate drywall sheets for walls after openings and waste.
sheets = ceil((perimeter × height − openings) × (1 + waste) ÷ sheet area)
Worked example
Room perimeter (m): 18; Wall height (m): 2.7; Doors and windows area (m²): 6; Sheet area (m²): 2.88; Waste allowance (%): 10.
Net wall area: 42.6 m²; Area including waste: 46.86 m²; Sheets required: 17 sheets.
Assumptions and limits
Complex layouts, ceilings, fire or moisture ratings, doubled layers, and stud spacing can change the order.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate drywall sheets for walls after openings and waste. The result follows the displayed formula and keeps every adjustable assumption visible.
When this tool is useful
Use this tool to plan quantities or compare scenarios before making a purchase or technical decision.
Understanding your inputs
| Input | What to enter |
|---|---|
| Room perimeter (m) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Wall height (m) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Doors and windows area (m²) | Enter a number of at least 0 and no more than 1000000000000. |
| Sheet area (m²) | Enter a number of at least 0.000001 and no more than 1000000000000. |
| Waste allowance (%) | Enter a number of at least 0 and no more than 100. |
Frequently asked questions
What can change the drywall sheets result?
Complex layouts, ceilings, fire or moisture ratings, doubled layers, and stud spacing can change the order.
Should I round the inputs first?
No. Enter the best measurements available and round only the practical final quantity, such as full packs, boards, sheets, or components.