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Lumber Calculator

Estimate lumber quantity and cost

Lumber Calculator

A lumber calculator estimates the quantity and cost of timber needed for construction projects — framing, decking, fencing, or furniture — based on dimensions and member count.

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Tip: Pressure-treated timber is essential for any application that may contact soil or moisture. Using untreated wood in ground contact leads to rapid rot — a common and expensive DIY mistake.

  1. 1List each member type (e.g., 2×4 studs, 2×6 joists, 4×4 posts)
  2. 2Calculate length per member × number of members
  3. 3Convert to board feet or linear metres for pricing
  4. 4Add 10% for waste, cuts, and miscuts
25 studs at 2.4m · 15 joists at 3.6m · 10×10 post timber=Total linear metres by member type + 10% wastePrice varies by species and treatment
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