Decking Calculator
Estimate decking materials for your outdoor project
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Frequently Asked Questions
How do I calculate decking boards?
Board count = (Deck width × 12) ÷ (Board width + Spacing). Add 10% for waste and cuts.
What spacing should I use between boards?
0.25″ is standard for pressure-treated lumber. Composite decking may require 0.125″ spacing.
Should I run boards perpendicular or parallel to the house?
Perpendicular is most common. Parallel may be used for diagonal patterns or specific aesthetics.
How much extra material should I buy?
10-15% extra is recommended for waste, especially for complex shapes or inexperienced installers.
What about joist spacing?
Standard joist spacing is 16″ on center. Check local building codes for specific requirements.