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A deck cost calculator estimates what a new deck will cost — materials and labour together — from its size and the prices you enter. It's built for budgeting and for sanity-checking a contractor's quote, not for pretending there's one true price (there isn't — decks vary enormously by material and region).
Enter the deck size, a material price per square foot, and a labour rate (or zero for DIY). The defaults are 2026 national ballparks; replace them with your decking's price and a real quote for a number you can trust.
Materials = area × (1 + waste) × price per square foot; labour = area × labour rate; total is the sum. Decking material is only part of the bill — framing, footings, fasteners and railing matter too, so use an all-in material price or add those separately. Default ranges are from 2026 cost guides (Angi, HomeGuide).
A 16 × 12 ft deck (192 sq ft) at $14/sq ft material (+10% waste) and $20/sq ft labour comes to about $6,800 — roughly $35/sq ft installed.
| Decking material | Installed / sq ft | 16×20 ft deck (320 sq ft) |
|---|---|---|
| Pressure-treated wood | $20–30 | $6,400–9,600 |
| Cedar / redwood | $30–45 | $9,600–14,400 |
| Composite (mid-range) | $35–55 | $11,200–17,600 |
| Premium composite (Trex) | $45–80 | $14,400–25,600 |
Installed (materials + labour), US national averages 2026 (HomeGuide, Angi, Ergeon; Zonda Cost-vs-Value). Railings, height, footings and site access swing the total. Enter your own prices above.