Deck Calculator
Estimate deck boards by area and board width, with a 10% waste margin.
Runs locally in your browser — your measurements never leave this pageTry: Length=12, Width=10, Board width=6, Waste=10, Price per board=0, Units=ft → 120.00 ft², 6 in, 264
How to use
Enter the deck length and width and the board width (in inches). The calculator divides the area by the board coverage and adds 10% for end cuts and stairs.
FAQ
Does this include stairs or railings?
No — it counts the flat deck surface only. Add stair treads and railing boards separately.
What waste for a deck?
10% standard; 15% if you are picture-framing the border or using a diagonal layout.
How wide are deck boards?
Common widths are 4, 6, and 8 inches (actual face is a little under nominal).
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