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Decking Floor Estimator and Calculator

With the frame of your deck built, one of the final steps is overlaying the substructure with decking materials. Depending on the finished look you want to achieve, you’ll need to determine just how much material you’ll need to carry out your deck design plans.

Use our deck flooring estimator to find out how much material you’ll need to complete your project. Your results will show you:

  • The number of boards (by length) required
  • Required number of boards (including waste factor)
  • The number of screws and hidden fasteners needed

Once you know how much material you’ll need, use our pricing calculator to get a feel for the cost of materials, depending on whether you plan to use a specific species of wood, composite, or other type of material (such as PVC flooring).

Total Square Feet

Enter Total Square Feet
Or, Enter Dimensions
* Required
* Required

Board Size

2"x4" or 5/4"x4" 2"x6" or 5/4"x6"

Joist Spacing

12" o.c. 16" o.c. 19.4" o.c. 24" o.co

Decking Angle

90° to joist 45° to joist

Total Length Of Perimeter

How Many Deck Boards Do I Need?

Choosing boards to form your deck flooring is one part aesthetics and one part mechanics. Beyond selecting the type of wood or composite decking materials, you’ll also need to know how many boards -- and what size -- you’ll need to create the flooring for your deck.

There are several factors that determine how many boards you’ll need to form your flooring:

  • Size of your deck, which can be determined in either:
    • Total square footage
    • Length x Width in feet and inches (total length of your deck’s perimeter)
  • Board size
  • The angle of your decking
    • 90° to the joist (giving a horizontal, straight-across look)
    • 45° to the joist (giving a diagonal, slanted look to your floor boards)
      • Note: This style will add another 10% to 15% waste on top of normal waste.
    • Chevron, herringbone, inlays, or other more intricate patterns for deck flooring will require more materials and may cost more in terms of labor and materials. You will also want to add an additional 10% to 15% waste beyond normal waste.

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