Composite Decking Calculator

Enter your deck dimensions and board length to estimate how many composite decking boards, hidden fastener clips, and fascia boards you need — with a side-by-side cost comparison across decking grades.

Deck Length (ft)

Deck Width (ft)

Waste Factor (%)

Pricing (edit to match local rates)

Standard ($/board)

Capped ($/board)

PVC ($/board)

Clip Box ($/box of 90)

Fascia Board ($/board)

Deck Area

240 sq ft

60 boards of Standard Composite (12ft, incl. 10% waste)

Hidden Fastener Clips

594

7 boxes of 90

Fascia Boards

12ft boards for deck perimeter

Best Total Cost

$1,815.00

Standard Composite

Purchase Option	Quantity	Est. Cost
Standard CompositeBest value	60 boards	$1,815.00
Capped Composite	60 boards	$2,595.00
PVC Decking	60 boards	$3,375.00

Cheapest option: Standard Composite at $1,815.00This total includes decking boards, hidden fastener clips, and edge fascia for a 240 sq ft deck. Standard composite is the most affordable option. It offers good durability but may fade or stain more than capped alternatives over time.

Start & end clipsYou will also need approximately 54 start/end clips for the first and last boards. These are typically sold separately from hidden fastener clips.

This is a material estimate only. Actual board count may vary depending on deck layout, joist spacing, diagonal vs. parallel installation, and board orientation. Always order extra boards for cuts and waste.