Calculate deck board count and total linear footage from deck size, board width, spacing and waste. Estimate material before ordering boards for your project.
Enter your measurements and material details.
Board availability in standard lengths affects splice planning and waste.
The deck board calculator estimates how many board rows span the deck width and how much total linear footage is needed when boards run in the entered length direction. It is best for simple rectangular decks with straight board layouts.
Use actual finished deck dimensions and actual board width rather than nominal lumber size. Composite decking frequently has a specific installed gap system; pressure-treated lumber spacing may depend on moisture and installation instructions.
Enter the actual face width, not the nominal size. Many nominal 2×6 boards are about 5.5 inches wide.
Yes. Small gaps accumulate across the full deck width and can change the row count.
No. Stair treads and landings should be calculated separately.
Yes, if you enter the actual board width and required gap for that product.
Waste covers end cuts, defects, damaged boards and length combinations that do not fit perfectly.
Using the example inputs shown in the calculator — Deck length / board run (ft) = 16, Deck width (ft) = 12, Actual board width (in) = 5.5, Gap between boards (in) = 0.125, Waste allowance (%) = 10 — the result is 26 deck boards. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Board length total: 457.6 linear ft; Deck area: 192 sq ft. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this deck board calculator, the inputs with the greatest practical effect are deck length / board run, deck width and actual board width. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
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