Home Calculators Board Feet Calculator

Board Feet Calculator

Calculate lumber volume in board feet for woodworking and construction projects. Add multiple boards and get instant totals with cost estimation.

Your Lumber List

Enter each board's dimensions — thickness × width × length

Dimensions in:
Qty
Thick (in)
Width (in)
Length (ft)
BF
optional
Total Board Feet
—
board feet
Total Boards
—
pieces
Estimated Cost
—
USD
Volume (ft³)
—
cubic feet

Formula & Common Lumber Sizes

Board Feet Formula

BF = (Thickness" × Width" × Length') ÷ 12

One board foot = 144 cubic inches = a piece 1" thick × 12" wide × 12" long

1×4 @ 8ft
2.67 BF
1×6 @ 8ft
4.00 BF
2×4 @ 8ft
5.33 BF
2×6 @ 8ft
8.00 BF
2×8 @ 10ft
13.33 BF
2×10 @ 12ft
20.00 BF
4×4 @ 8ft
10.67 BF
4×6 @ 10ft
20.00 BF

Note: Nominal dimensions (e.g. 2×4) are slightly larger than actual dimensions (1.5" × 3.5"). This calculator uses the nominal dimensions you enter.