Deck Board Calculator — How Many Deck Boards Do I Need?

Free Deck Board Calculator. Enter deck dimensions and board width to calculate the exact number of boards needed with gap spacing.

🪵 Deck Board Calculator

Deck Length (ft)

Deck Width (ft)

Board Width (inches)5.5 in (2x6)3.5 in (2x4)5.25 in (Composite 5/4x6)

Board Length (ft)8 ft10 ft12 ft16 ft

Boards Needed

With 10% Waste

💡 Pro Tip

Pre-drill holes near board ends to prevent splitting. Use hidden fasteners for a cleaner look that protects fasteners from moisture and weathering.

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Frequently Asked Questions

Q: How many deck boards do I need?

Divide your deck area by the coverage area per board (board length × board width minus gap). Add 10% for waste from cuts.

Q: What is the standard gap between deck boards?

The standard gap is 1/8 inch (3mm) to allow for wood expansion and proper drainage. For composite decking, follow the manufacturer's specification.

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