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home.deck-lumber-calculator Calculator
Calculates board feet of lumber needed for a deck from dimensions, joist spacing, and board width, including waste factor and fastener count. Lumber quantities are notoriously easy to miscalculate when accounting for butt joints, trimming, and span direction.
Inputs
Deck Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Deck Width M
Horizontal extent perpendicular to the length.
Board Width Mm
Horizontal extent perpendicular to the length.
Gap Mm
Reference formula or conversion factor shown for context.
Board Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
total boards required
The combined total across all inputs and components.
number of rows
Sample size or count used in the calculation.
boards per row
Reference formula or conversion factor shown for context.
deck area (m²)
The computed two-dimensional surface area.
linear metres of decking
Sample size or count used in the calculation.
waste factor
A dimensionless multiplier applied in the calculation.