Drywall Screw Calculator

Quantity entry. Choose a known sheet count or estimate the sheet count from area. Area entry rounds partial sheets up before applying screws per sheet. It does not lay out the boards or account for changes in sheet size within one entry.

Number of sheets. Enter the whole number of sheets being fastened. Count each layer separately where the fastening schedule applies to it. Use a separate estimate when different sheets or assemblies require different screw counts.

Measured area (sq ft). Enter the drywall area being fastened with the selected sheet size. This is used to estimate a whole-sheet count. It is not a substitute for a board layout around openings and edges.

Area per sheet (sq ft). Enter the square-foot area of one sheet used in this estimate. For example, multiply its width in feet by its length in feet. Calculate mixed sheet sizes separately so the screw-per-sheet assumption stays meaningful.

Screws per sheet. Enter the required screws for one sheet under your fastening detail. Wall versus ceiling use, framing spacing, edge fastening, layers and rated assemblies can change this number. No universal screw schedule is supplied.

Screws per box. Enter the whole number of screws in the package you plan to buy. The result rounds the allowance-adjusted demand up to complete boxes. Use the actual count for the selected fastener rather than assuming a box weight equals a fixed count.

Allowance (%). Enter the percentage you want to add for cutting, handling loss or other conditions specific to this work. Apply it to the measured quantity rather than enlarging the measurements as well. The suggested value is editable, not a universal recommendation; enter zero when no allowance is needed.

Sheets used is either your count or the area-based count rounded upward. Net screws multiply that count by screws per sheet. The allowance-adjusted demand is then shown as whole screws and whole boxes. Check the fastening schedule for the actual assembly before using the quantity.

Sheets = entered count, or ceil(area ÷ sheet area). Net screws = sheets × screws per sheet. Apply allowance, then round up the screw and box requirements.

Worked example: 10 sheets at an illustrative 32 screws each need 320 screws. With 10% allowance, allow 352 screws, or 4 boxes of 100. The 32-screw example is not an installation specification.

Editable fastening count only, not a code-approved schedule. Wall/ceiling use, framing spacing, layers, rated assemblies, edges and fastening products control the actual pattern. Estimate mixed sheet sizes separately.