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.

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.

  1. Measure the rectangular coverage area.
  2. Enter the selected sheet's usable coverage.
  3. 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 questions

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.

Reference notes

Related calculators

Enable JavaScript to use the interactive calculator and save a project estimate.