Decking Board Calculator
Construction & DIYCalculate deck floor boards, total linear footage, joist counts, and fastener screws needed for rectangular composite or wood decking projects with gap spacing.
Deck area 192 sq ft · joists (16″ OC) ≈ 13
About this calculator
Building an outdoor deck requires estimating deck surface boards, hidden fasteners or face screws, and structural floor joists at 12" or 16" on-center spacing.
This calculator computes total deck surface square footage, board counts by length (12ft, 16ft, 20ft), deck board gap allowances, joist lumber counts, and estimated screw fasteners.
How It Works & Formula
Effective Board Width = Board Width + Gap Spacing. Total Runs = ceil(Deck Length / Effective Board Width). Linear Footage = Total Runs × Deck Width × (1 + Waste %). Joists = ceil(Deck Width / Joist Spacing) + 1.
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