Deck Calculator — Multi-step FormDeck Calculator — Multi-step FormMetric/Imperial unit support, conditional fields, wastage and cost estimation included.Step 1 of 7 — Deck ShapeWhat shape deck are you building? Rectangle Square TriangleChoose the shape so we show the right dimension fields next.Enter the deck dimensions Units Meters (m)Feet (ft) Length (m) Width / Base (m) Height (for triangle) (m) If you choose Square, only 1 side is needed — we'll use length = width.Board & material options Board width (mm) 90 mm120 mm145 mm190 mm Board gap (mm) 3 mm4 mm5 mm6 mm Material type TimberCompositeAluminium Wastage factor (%) 5%8%10%15% Board width + gap defines how many boards you'll need across the deck width/base.Joist & sub-structure settings Joist spacing (mm) 400 mm450 mm600 mm Post/Beam spacing (m) Joist material TimberSteelComposite Joist spacing helps estimate number of joists and posts required.Additional features & extras Railing Skirting Stairs Built-in seating LightingStair details Number of stair runs Stair width (m) Railing length Railing length (m) Costs & calculate Decking cost (per m²) If you prefer per-board pricing, fill 'costPerBoard' below. Cost per board (optional) Sub-structure cost (per m) Labour estimate (total) Calculate estimate Preview SummaryGet your quote or email the results Name Email Phone (optional) Comments / Notes Submit & Email Quote Download Summary (JSON) Back Reset Next
