CALCULATORDECK-BOARD-CALCULATORCALCULATE · DECIDE · ACT
Exterior & Landscape Calculators · reviewed September 1, 2026
Deck Board Calculator
Estimate deck-board rows, linear feet, and stock-board quantity for a rectangular deck from board width, gap, length, and waste.
Ready.
Enter your measurements and calculate.
Enter your measurements and calculate.
Worked example
Example
A 16 × 12 ft deck using 5.5-inch boards with a 3/16-inch gap needs roughly 26 board rows before waste.
References
Sources & assumptions
Last reviewed September 1, 2026. Defaults are starting points; product-specific inputs are editable wherever coverage varies.
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FAQ
Common questions
What gap should I use?
Use the product installation instructions. Trex, for example, publishes width-to-width gap guidance for its products.
Does this calculate joists or footings?
No. Structural design is intentionally outside this calculator.
Does it account for picture framing?
No. Add those boards separately.