Decking
Estimate decking materials including number of boards, fasteners needed, and total cost for your deck project. Free online deck material calculator with cost breakdown.
About This Calculator
The Decking Material Calculator helps you estimate the number of decking boards, fasteners (screws, nails, or hidden clips), and total cost for your deck project. Simply enter your deck dimensions and board specifications to get an accurate material list and budget estimate.
This calculator uses standard construction formulas: deck area is calculated as length x width, the number of boards is determined by dividing deck area by the area of one board (with 10% added for waste), and fasteners are estimated at 3.5 per square foot for screws/nails or 1.75 per square foot for hidden clips. The cost breakdown combines board cost and fastener pack cost to give you a complete project estimate.
Decking Materials
- Pressure-Treated Wood: Most affordable option. Requires annual staining/sealing. Common in the US and UK.
- Hardwood (Teak, Ipe): Durable and beautiful but expensive. Popular for premium decks.
- Composite Decking: Made from recycled plastics and wood fiber. Low maintenance, no staining needed, but costs more upfront.
- PVC/Plastic Decking: Lightweight, rot-proof, and requires no maintenance beyond cleaning. Most expensive option.
Regional Notes
United States: Uses imperial measurements (feet/inches). Standard board width 5.5". Typical cost $15-$35 per sq ft for wood, $25-$50 for composite. Pressure-treated pine is the most common material.
United Kingdom: Decking is measured in metres. Standard board width 120-150mm. Typical cost £30-£80 per sq m for softwood, £50-£150 for composite. Timber treatment is essential due to damp climate.
India: Uses feet for measurement. Common woods include teak, sal, and rubberwood. Typical cost ₹800-₹2,500 per sq ft depending on wood quality. Termite treatment is recommended.
Note: This calculator does not include costs for substructure (posts, beams, joists), permits, railings, stairs, or labor. Check local building codes before starting your project.
Frequently Asked Questions
How do I calculate how many decking boards I need?
Calculate your deck area (length x width), divide by the area of one board (board length x board width in feet), then multiply by 1.1 to account for 10% waste. Round up to the nearest whole board.
How many screws do I need for decking?
A standard rule of thumb is 350 screws per 100 square feet of decking, or 3.5 screws per square foot. For hidden fasteners, you need half that amount (1.75 per sq ft).
What is the standard size of a decking board?
Common decking board widths range from 3.5 inches to 6 inches, with 5.5 inches being the most popular. Standard lengths are 8 ft, 10 ft, 12 ft, 16 ft, and 20 ft.
What is the cheapest type of deck to build?
Pressure-treated pine or softwood is the cheapest decking material, costing 20-30% less than traditional wood. However, factor in long-term maintenance costs like staining and sealing.
How much does it cost to build a deck?
Decking costs vary by material and size. In the US, expect $15-$35 per sq ft for wood decking and $25-$50 per sq ft for composite. In the UK, £30-£80 per sq m. In India, ₹800-₹2,500 per sq ft depending on wood type.
What is composite decking?
Composite decking is made from a mixture of recycled plastics, waste wood fiber, and bonding agents. It is more durable than wood, requires less maintenance, but costs more upfront.
Should I use screws or nails for decking?
Screws are easier to remove and provide stronger holding power than nails. Nails are faster to install but harder to remove for repairs. Hidden clips create a smooth surface but require grooved-edge boards.
How much waste should I account for when buying decking boards?
Add 10% to your total board count to account for cuts, waste, and defective boards. For angled or complex deck layouts, consider adding 15% waste instead.