Decking calculator
Estimate boards, framing and fixings for a timber or composite deck.
Your measurements
How it's worked out
Board rows = width ÷ (board width + gap). Joists at your spacing run across the boards, bearers at your spacing carry the joists, and posts sit under each bearer. Two screws per board per joist.
Estimates only. Check sizes, coverage and quantities with your supplier, engineer or certifier before ordering. Standards references are a guide, not compliance advice.
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