MEASURE ONCE. PLAN YOUR PURCHASE.

Specified Drywall Panel Screw Grid calculator.

Count mathematical perimeter and interior screw positions on identical panels using your supplied grid, with corners counted once.

WALLS

Your inputs

Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.

Panel width

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Panel length

Where to get this value

Measure this dimension in your plan or on site and use the displayed unit. For irregular shapes, divide the geometry into the supported sections.

Specified perimeter spacing

Where to get this value

Copy this specification from your supplied design or product documentation. This tool does not select spacing, fixing patterns or structural requirements.

Specified interior grid spacing

Where to get this value

Copy this specification from your supplied design or product documentation. This tool does not select spacing, fixing patterns or structural requirements.

Identical panels

Screws per box

Where to get this value

Use the actual usable quantity or dimensions of the product you intend to buy. Check the label and the unit shown here.

YOUR ESTIMATE

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A clear estimate starts here.

Enter your dimensions and product details to see the quantity and purchase breakdown.

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Formula and assumptions

BEHIND THE NUMBERS

How this calculation works.

Count mathematical perimeter and interior screw positions on identical panels using your supplied grid, with corners counted once. Perimeter = 2 ceil(width / edge spacing) + 2 ceil(length / edge spacing); interior = (ceil(width / field spacing) − 1) × (ceil(length / field spacing) − 1).

Perimeter = 2 ceil(width / edge spacing) + 2 ceil(length / edge spacing); interior = (ceil(width / field spacing) − 1) × (ceil(length / field spacing) − 1).Calculated with normalised units

A worked example

Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.

Panel width: 1.2 m
Panel length: 2.4 m
Specified perimeter spacing: 0.3 m
Specified interior grid spacing: 0.6 m
Identical panels: 10
Screws per box: 100

Screw boxes for the supplied panel grid: 3 boxes

This is a mathematical panel grid: corners counted once, interior positions at multiples of the supplied field spacing. It does not choose a fastening schedule, supporting member pattern or shared-edge fixings.

Before you purchase

Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.

All product dimensions, coverage, density, allowances and joining rules must come from your supplied plan or selected product. No building-code values are inserted.

Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-05. Calculation and review policy.