Deck cost & materials calculator
Enter your deck size and material to get the boards, joists, footings, and fasteners you need, plus an installed cost estimate. Free, instant, no signup.
Board count includes a 10% waste allowance. Assumes 5½" boards.
Deck cost by material
Frequently asked questions
How much does it cost to build a deck?
Installed decks cost about $15–$25 per square foot for pressure-treated wood, $20–$38 for cedar, $30–$60 for composite, and $35–$70 for PVC. A 12×16 (192 sq ft) composite deck runs roughly $5,760–$11,520. Enter your size and material above for an estimate.
How many deck boards do I need?
Divide the deck area by the coverage of one board — a 5½-inch by 16-foot board covers about 7.3 square feet — then add about 10% for waste. A 12×16 deck (192 sq ft) needs roughly 29 boards. The calculator counts boards, joists, footings, and screws for you.
How far apart should deck joists be?
Most decks use joists 16 inches on center. Composite decking or diagonal board patterns often call for 12 inches on center for a stiffer feel. The calculator lets you pick 12, 16, or 24 inches and counts the joists accordingly.
Is composite decking cheaper than wood?
No — composite costs more upfront (about $30–$60 per square foot installed vs. $15–$25 for pressure-treated). But it needs no staining or sealing and lasts 25+ years, so over the life of the deck the total cost is often competitive.