Lumber Calculator
Calculate board feet of lumber needed for any project.
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How It Works
Calculates board feet: length (in) x width (in) x thickness (in) / 144. Lumber sold in nominal dimensions but actual are smaller.
Formula
BF = T x W x L / 12Quick Reference
Common calculations — results you can verify instantly.
2×4, 8ft long
2×4×96/144
5.33 BF (nominal)
1×6 plank, 10ft
1×6×120/144
5 BF
1 BF = ?
Standard unit
144 cubic inches
Tips & Shortcuts
A 2x4 actually measures 1.5 x 3.5 inches.
Add 15% waste for framing. 20% for finish work.
Common Mistakes
Using nominal dimensions for volume
Use actual dimensions: 2x4 is actually 1.5 x 3.5 inches.
Not adding waste to order
Add 10-20% to lumber order for cuts and defects.
Frequently Asked Questions
1 inch thick x 12 inches wide x 12 inches long = 144 cubic inches.
Nominal: 2x4x96/144 = 5.33 board feet.
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