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A deck calculator estimates the decking boards, joists, posts, and fixings needed to build a timber or composite deck. It also estimates the total cost based on material choice.
Trin-for-trin guide
- 1Calculate deck area (length × width)
- 2Board count: area ÷ (board width − gap) × board length; add 10% for diagonal or waste
- 3Joist spacing: typically 400mm centres; number = deck length ÷ 0.4 + 1
- 4Posts: typically every 1.5–2m where frame meets ground
Løste eksempler
Input
4m × 3m deck · 140mm×28mm boards at 5mm gap
Resultat
~20 boards at 4m length
3m ÷ 0.145 = 20.7 runs