Outdoor project planning
Deck Board Calculator
Estimate deck-board courses, board count, linear footage, fasteners, and waste for a rectangular deck.
Your estimate will appear here
Enter your project details and calculate for a practical planning estimate.
How this estimate works
- • Courses = covered width plus one gap, divided by actual board width plus gap, rounded up.
- • Stock pieces per course = board run divided by stock length, rounded up; total stock boards apply the selected waste allowance.
- • Fasteners assume two fasteners at every estimated board-to-joist crossing, plus 5%.
Before you begin
- • This rectangular surface estimate does not design framing or verify structural spans, loads, footings, guards, stairs, or permits.
- • Borders, diagonal layouts, openings, inlays, butt-joint staggering, unavailable stock lengths, and damaged boards can increase material.
- • Actual board dimensions and required gaps vary by material, moisture content, temperature, and manufacturer.
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