Drywall Calculator
Estimate how many drywall or plasterboard sheets you need for a rectangular wall or ceiling area. Enter sheet dimensions and a waste percentage for cuts and offcuts.
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How the drywall calculator works
Estimate how many drywall or plasterboard sheets you need for a rectangular wall or ceiling area. Enter sheet dimensions and a waste percentage for cuts and offcuts.
Sheets needed = total board area ÷ sheet area, rounded up after the waste allowance is applied. The calculator is designed to give a useful first-pass material estimate while keeping the assumptions visible. For a purchase, compare the result with the product packaging or supplier quotation.
Common search terms for this tool include drywall calculator, sheetrock calculator, drywall sheet calculator, how many drywall sheets do I need. The wording is included naturally so the page answers the same questions people ask when planning a project.
Frequently asked questions
Does this include walls and ceilings?
Yes. Enter the total surface area you plan to board.
What sheet size should I enter?
Use the actual dimensions of the drywall sheets you plan to buy.
How much drywall waste should I allow?
Waste depends heavily on room shape, openings and sheet layout. Use the default as a starting estimate and adjust for complex rooms.
Does it calculate screws and compound?
Not in this first version. It focuses on board quantity.