Does this determine sheathing thickness?

No. Sheathing type, thickness, fastening and structural requirements need independent verification.

Does it optimise layout?

No. It estimates quantity only; cut sequencing and edge support require a detailed plan.

Lumber & framing calculator

Plywood & sheet goods calculator

Whole sheet-goods quantity from rectangular coverage, selected sheet coverage and allowance.

Calculator result and formula

Sheets to order: 11 sheets

Formula: Coverage length × width × (1 + waste) ÷ sheet coverage

Formula ID: LUM-SHEET-001 · Version 1.0.0 · Published · Last reviewed Aug 26, 2026.

Inputs

Coverage length: Finished rectangular coverage length Default: 20.
Coverage width: Finished rectangular coverage width Default: 16.
Sheet coverage: Coverage of one selected sheet Default: 32.
Waste factor: Allowance for cuts, openings and layout Default: 10.

How this calculator works

This calculator divides a rectangular coverage area plus a visible allowance by the selected sheet's actual coverage and rounds to whole sheets.

Measure the rectangular coverage area.
Enter the selected sheet's usable coverage.
Increase allowance for openings, layout, seams and cut complexity.

Worked example: Example: a 20 ft × 16 ft area is 320 ft². With 10% waste and 32 ft² sheets, the purchase quantity rounds to 11 sheets.

Assumptions and limitations

Coverage area is rectangular; complex geometry should be divided into measured sections.
Sheet coverage must match the selected product.
Waste is applied before whole-sheet rounding.

Common mistakes to avoid

Confirm the measurement basis and units before using the result.
Keep waste or allowance visible and adjust it for the actual job conditions.
Confirm supplier packaging, delivery increments, specifications, and final site requirements before ordering.

Calculator disclaimer

This planning calculator does not determine structural design, code compliance, installation requirements, or guaranteed pricing. Confirm final requirements with the appropriate responsible professional, authority, manufacturer, and supplier.

Formula review and sources

Internal QA complete · independent external review pending · 1 source reference.

Autodesk: sheathing takeoff guidance

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