Construction calculator
Decking Calculator
Estimate decking board rows, linear material, stock-board count, waste, fasteners and optional project cost.
Enter deck dimensions and calculate.
Decking example
Example: 20 ft × 12 ft deck, 5.5 in board face, 1/8 in gap, 12 ft stock boards, 10% waste.
Board pitch = (5.5 + 0.125) ÷ 12 = 0.46875 ft
Rows = 12 ÷ 0.46875 = 25.6 → 26 rows
Linear decking = 26 × 20 = 520 ft
With 10% waste = 572 ft
572 ÷ 12 = 47.67 → 48 boards
Rows = 12 ÷ 0.46875 = 25.6 → 26 rows
Linear decking = 26 × 20 = 520 ft
With 10% waste = 572 ft
572 ÷ 12 = 47.67 → 48 boards
Board spacing and actual width
Use the board's actual face width rather than its nominal trade name. The gap is added to the face width to estimate how much deck width each board row occupies.
Joist and fastener estimates
The joist and fastener figures are planning estimates only. Actual joist direction, spacing, blocking, board pattern, fastening system and local structural requirements can materially change quantities.
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