Board layout, picture framing, stairs, and breaker boards can change the count.
Decking
Deck Board Calculator
Enter deck dimensions and board specs to estimate how many boards and fasteners to buy.
Example estimate ready.Change the measurements and product prices below. Values save only on this device.
Calculation method
How the estimate is built.
Board face width plus gap determines rows across the deck. Deck length and stock-board length determine boards per row; waste rounds material up. Fasteners estimate two at each joist crossing plus the same buffer.
Field notes
Use the estimate well.
Composite decking often has manufacturer-specific spacing and fastening rules.
Buy compatible screws or hidden fasteners for your board material.
FAQ
Deck Boards questions
How many deck boards do I need?
The count depends on deck width, board face width, gap, board length, and waste. This calculator estimates straight runs.
Does this calculate framing lumber?
No. It estimates surface boards and fasteners, not beams, joists, posts, stairs, or railing.
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