Why does the calculator ask for board face width?

Because the math follows visible deck coverage. Enter the exposed face width you want to cover the surface with, not a nominal product label or an assumed regional standard.

Why are rows and boards per row rounded up?

A partial course still needs a full row, and a partial run still needs a full stock board. The final board total is rounded up again after waste because the buying estimate has to end on whole boards.

What waste rate should I enter?

Enter the rate you want to plan around. Simple rectangles, diagonal layouts, picture-frame borders, defects, and heavy trimming can all change real waste, so this tool leaves that choice to you.

Does this include joists, framing, fasteners, or code checks?

No. This is a surface-board estimator only. It does not size framing, joists, footings, fasteners, structural members, or code-compliance details.

Does the sketch show an exact cut plan?

No. It is only a sanity-check view of rows across the deck width and stock-board breaks along the deck length. Actual seam placement and cut optimization can differ on site.

Decking Calculator

Estimate how many decking boards to buy for a rectangular deck surface. Enter your own deck size, board face width, gap, stock board length, and waste rate to turn rough measurements into a practical board count before shopping.

Birimler

Deck length

Deck width

Board face width

Gap between boards

Board length to purchase

Waste allowance

Örnekler

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Formül

r = \left\lceil \frac{W_d}{W_b + g} \right\rceil

b_r = \left\lceil \frac{L_d}{L_b} \right\rceil

N = \left\lceil r \cdot b_r \cdot \left(1 + \frac{w}{100}\right) \right\rceil

L_t = r \cdot L_d

A = L_d \cdot W_d

A_w = A \cdot \left(1 + \frac{w}{100}\right)

The calculator treats the deck as a rectangle with boards running along the entered deck length and rows stacking across the entered deck width. It divides deck width by board face width plus gap to get rows, divides deck length by the stock board length to get boards per row, multiplies those counts, then rounds up again after adding your waste allowance. Total decking length reports the net lineal coverage of the surface boards before waste; deck area and waste-adjusted area give a second check on scale.

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Decking Calculator

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