Calculator - Composite Decking

Deck Calculator — Multi-step Form

Metric/Imperial unit support, conditional fields, wastage and cost estimation included.

Step 1 of 7 — Deck Shape

What shape deck are you building?

Rectangle

Square

Triangle

Choose the shape so we show the right dimension fields next.

Enter the deck dimensions

Units

Length (m)

Width / Base (m)

If you choose Square, only 1 side is needed — we'll use length = width.

Board & material options

Board width (mm)

Board gap (mm)

Material type

Wastage factor (%)

Board width + gap defines how many boards you'll need across the deck width/base.

Joist & sub-structure settings

Joist spacing (mm)

Post/Beam spacing (m)

Joist material

Joist spacing helps estimate number of joists and posts required.

Additional features & extras

Railing Skirting Stairs Built-in seating Lighting

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)

Get your quote or email the results

Name

Phone (optional)

Comments / Notes

Deck Calculator — Multi-step Form

What shape deck are you building?

Enter the deck dimensions

Board & material options

Joist & sub-structure settings

Additional features & extras

Stair details

Railing length

Costs & calculate

Get your quote or email the results

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Contact Details

0416968210