Outdoor Decking Board, Subframe Joist & Fastener Screw Calculator
Calculate total linear feet or meters of timber/composite deck boards, subfloor joists (16" / 40cm on-center spacing), and deck screws needed with a 10% waste buffer.
Calculator Inputs
Live Real-TimeTotal Deck Board Runs Needed (10% Waste Included)
Subframe Support Joists Count (40cm Spacing)
14 joists
Total Decking Fastener Screws
784 screws
Detailed Calculation Breakdown
Calculation Methodology
Total Deck Boards = ceil(Deck Width / (Board Width + Gap)) * 1.10. Number of Joists = floor(Deck Length / 0.40m) + 1. Screws Count = Joists * Boards * 2.
Important Legal & Educational Disclaimer
Always maintain 3mm–6mm (1/8" to 1/4") gaps between decking boards for proper thermal expansion and rainwater runoff drainage.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
Frequently Asked Questions
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