Deck Materials Calculator

Estimate decking boards, joists, beams, posts, railing, stairs, and total material cost for wood or composite decks. Includes realistic waste and framing.

Enter total deck area directly (skip length/width)

Deck length (ft)Deck width (ft)Board face width (in)Waste / overage (%)Decking typeJoist spacing (in OC)Post spacing (ft)

Include railingInclude stairs

Railing length (ft)

StringersTreads / steps

Material pricing

Price per boardPrice per sq ft

Price per boardBoard length (ft)Joist / framing per linear ftPrice per post (6x6)Railing per linear ft (complete)Stairs total (stringers + treads)Hardware, screws, hangers, anchors

Decking boards needed

39.1 exact — 469.2 linear ft

Total estimated cost

$4,660

materials only (see breakdown below)

Deck area: 192 sq ft
Area with waste: 215 sq ft
Decking linear feet: 469.2 ft
Joists: 13 pieces • 156 ft total
Beams / girders: 32 ft total
Posts: 8
Railing: 56 ft
Stairs: 3 stringers, 4 treads

Cost breakdown

Decking: $2,720
Joists & framing: $351
Posts: $256
Railing: $1,008
Stairs: $180
Hardware & fasteners: $145
Total: $4,660

Waste covers cuts, ends, and damaged pieces. Joist count assumes joists span the width at the chosen spacing plus one end joist. Posts are estimated for beam support lines; attached decks often need fewer posts. Hardware is a practical allowance—add joist hangers, post bases, through-bolts, and screws as needed for your design.

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