How this calculator works
Actual length, width and thickness give the volume of one rectangular piece. Multiplying by the count gives total cubic volume; multiplying length by the count gives linear length. CWC lists nominal 2 x 4 surfaced dry lumber as 38 x 89 mm. Board-foot pricing can use different nominal or rough dimensions, so use the board foot page for that convention.
Formula
Vpiece = length x width x thickness; Vbatch = Vpiece x quantity; linear length = length x quantity; cost = quantity x price per piece. Quantity from a volume limit is rounded down.
Worked example
Ten boards, each 2 m long, 100 mm wide and 20 mm thick, contain 0.04 m3 and have 20 m total length. At $7 per piece the cost is $70.
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Frequently asked questions
Should I enter nominal dimensions?
Use actual dimensions for physical volume. A nominal 2 x 4 is not a 2 in by 4 in finished cross-section.
Does this optimise cuts?
No. It assumes identical complete pieces, without kerf, defects, end trimming or a cutting plan.
Why round quantity down?
That mode finds whole pieces that fit within a known total volume. It does not round up a purchase requirement.