Free OnlineCalculators & Converters
Lumber Calculator
Calculate board feet and linear feet for any lumber order. Add multiple pieces with different dimensions.
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QtyThickness (in)Width (in)Length (ft)Board Feet
5.33
Total Board Feet
5.33
BF = T(in) × W(in) × L(ft) / 12
Total Linear Feet
8.0
Key Features — Lumber Calculator
Board feet formula: T×W×L/12
Multiple piece types with quantity
Total linear footage
Running per-piece subtotals
Why Use This Tool — Lumber Calculator
Free Online Lumber calculatorBoard feet calculator — for EveryoneFast & Easy Board foot calculatorHow to calculate board feet — 100% FreeFree Online Timber calculator
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Frequently Asked Questions — Lumber Calculator
What is a board foot?
A volume unit equal to 1" × 12" × 12" = 144 cubic inches. Formula: (Thickness" × Width" × Length ft) / 12.
How do I calculate board feet?
2×4×8 = 2×4×8/12 = 5.33 BF. 2×6×10 = 2×6×10/12 = 10 BF.
Nominal vs actual lumber size?
A 2×4 is actually 1.5"×3.5" after milling. Use nominal for pricing by nominal size, actual for precise volume.