Decking Calculator

Start with deck dimensions, board choice, and fastener type. Open advanced options for area-only takeoffs, gap, waste, diagonal layout, joist spacing, or user-supplied pricing.

Layout Straight 90° Waste 10% waste Gap 1/8 in gap Price Off
Choose whether dimensions are entered in ft/in or m/mm.
Long deck dimension. Leave blank if using total area only.
Short deck dimension. Leave blank if using total area only.
Select nominal size; the calculator uses typical actual face widths.
Length of each board: feet in imperial mode, meters in metric mode.
Choose face screws or hidden clips; the inactive fastener output is left blank.
Advanced options
Layout Straight 90° Waste 10% waste Price Off
Use for L-shaped or irregular decks; overrides length × width when positive.
On-center spacing. Metric mode still chooses common 12/16/24 in spacings and converts internally.
Straight boards are the default. A 45° diagonal applies a 15% layout factor before waste and often needs tighter joist spacing.
Imperial: inches. Metric: millimeters. Typical dry install gap is about 1/8 in / 3 mm.
Use around 10% for straight rectangular layouts and 15–20% for diagonal layouts or extra cuts.
Optional. Adds board cost to the material estimate.
Optional. Enter screws or clips per box to estimate packs to buy.
Optional. Multiplies fastener packs by pack price.
Boards to order 29
Deck area 192 sq ft
Linear decking 464 ft
Screws 792
Show calculation details
Boards before waste 26
Boards per length run 1
Fastener packs —
Material cost —