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Free online Decking Calculator. Get an instant result, clear formula, practical explanation and advanced options when needed.
This calculator models a rectangular deck. For an irregular shape, split the plan into rectangles and calculate each area separately.
Timber estimate: 2 screws at every board–joist crossing. Butt joints and perimeter fixings may require extra screws and joists.
The entered allowance is added to the board length. Always check gaps, joist centres and fixings in the chosen product’s installation guide.
Material estimate based on the prices entered.
Uncheck to exclude labour entirely from the calculation and saved result.
Layout assumption: boards run along the deck length, joists run perpendicular, and rows use the entered usable board width plus gap.
Purchasing limit: the board count is a minimum obtained by dividing total linear length by stock length. It assumes offcuts can be reused between rows. The cutting plan, butt joints, doubled joists, perimeter details and available stock lengths may increase the order. Joist cost uses exact linear length and is not rounded to whole stock pieces.
