Subfloor Calculator

Calculate plywood or OSB sheets needed for a subfloor, including adhesive and screws.

Results

Visualization

How It Works

Subfloor is the structural layer between joists and finished flooring. It is typically 3/4" plywood or OSB screwed and glued to floor joists.

The Formula

Sheets = CEIL(Room Area / 32 sq ft x 1.10)

Variables

  • Sheet Size — Standard 4x8 ft sheet = 32 sq ft
  • 10% overage — For cuts, waste, and stagger offsets

Example

16x12 room = 192 sq ft. 192/32 = 6 sheets + 10% waste = 7 sheets.

Tips

  • Stagger sheet joints by at least 4 feet for structural integrity.
  • Always use both construction adhesive and screws — never nails alone.
  • Leave 1/8" gaps between sheets for expansion.
  • AdvanTech is moisture-resistant — ideal for bathrooms and kitchens.

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