How many deck boards do I need for a 12x16 foot deck?

For a 12x16 foot deck (192 square feet) using 16-foot long, 5.5-inch wide boards, you'll need approximately 42 boards with 10% waste. The calculation is: (192 sq ft ÷ 0.46 sq ft per board = 417 boards) plus 10% waste = 42 boards total.

What's the standard width of deck boards?

Most deck boards are 5.5 inches wide (known as 6-inch nominal width). This width is standard for pressure-treated lumber, cedar, redwood, and composite decking. Always verify your specific board width before calculating.

How much waste should I add for deck boards?

Add 5-10% waste for simple rectangular decks with few cuts. Add 10-15% for decks with angles, curves, multiple levels, or when using diagonal patterns. Complex designs may need 15-20% waste for safety.

What length of deck boards should I buy?

Choose board lengths that minimize seams. For a 12-foot wide deck, use 12-foot boards. For a 20-foot deck, use 20-foot boards or a combination of 12 and 8-foot boards. Longer boards reduce seams but are harder to handle.

Can I use this calculator for composite decking?

Yes, but composite decking often has different dimensions and installation requirements than wood. Verify your specific composite board width and length, and check if manufacturer recommends different joist spacing or fastening methods.

Why is my deck board estimate different from what the store calculated?

Differences can result from varying waste percentages, board size assumptions, or whether you're accounting for stairs, railings, or built-in features. Always verify your measurements and discuss waste allowance with your supplier or contractor.

Decking Calculator

Calculate the number of deck boards needed for your outdoor deck project. Estimate boards, linear feet, and material cost based on deck dimensions and board size with waste allowance.

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Common Deck Sizes

Popular deck dimensions for quick estimation

Deck Dimensions & Board Specifications

Enter deck size, board dimensions, and waste allowance

Deck Length (ft)

Deck Width (ft)

Board Length (ft)

Board Width (in)

Waste Allowance (%)

Price per Board (optional)

How it works: Enter deck dimensions and board size. The calculator divides deck area by board area, then adds waste allowance for cuts and off-cuts. Standard deck boards are 5.5" wide (6" nominal).

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