Decking Calculator

Your details

The longest dimension of your deck surface.
ft
The shorter dimension of your deck surface.
ft
Diagonal and herringbone cuts increase offcut waste.
Nominal lumber size. Actual face width is about 0.5" narrower due to milling.
Standard lumber lengths. Longer boards mean fewer end joints.
Typical gap is 1/4" (0.25") for pressure-treated, or 1/8" for pre-dried composite.
in
Most residential decks use 16" on center. Use 12" for diagonal patterns or heavier loads.
Cost per linear foot is a 2025 retail estimate; actual prices vary by region and supplier.
Leave at 0 to use the built-in estimate for the chosen material, or enter your own quote.
USD
Hidden fasteners give a cleaner surface but cost more. Many builders use screws at the perimeter and hidden fasteners in the field.
Boards neededMid-range materials
28

Total boards including waste allowance for your pattern

Deck area192sq ft
Deck screws465screws
Hidden fasteners0clips
Total linear feet448lf
Material cost (boards)291.2USD
Cost per sq ft1.52USD/sq ft
Waste allowance0%
Boards28
Screws (x0.01)465
Hidden fasteners0

You need about 28 boards for a 192 sq ft deck.

  • Your 192 sq ft perpendicular deck requires 28 boards, including a 10% waste allowance for offcuts and damaged pieces.
  • Boards-only material cost is about $291 at the selected price per linear foot. Add 30-50% for framing lumber, fasteners, concrete, and hardware.
  • Using 16-ft boards minimises end joints and gives a cleaner look, but make sure your supplier stocks that length.

Next stepOrder 10-15% extra if your supplier sells in fixed-length bundles that do not perfectly divide your run length.

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