Board Feet Calculator · Free calculator

4x4 Board Feet Calculator

Every linear foot of 4x4 lumber is 1.333 board feet (nominal 4" × 4" × 12" ÷ 144). An 8-footer is 10.67 BF. Actual dressed size is 3.5" × 3.5".

Quick answer

LIVE

Total board feet

117.33BF

incl. 10% waste · 106.67 BF net

BF per piece

10.67BF

Linear feet

80.0LF

Actual size

3.5" × 3.5"

Est. cost

—

Length	BF per board	BF × 10 boards	Boards per 1,000 BF
4x4x8	10.67	106.7	94
4x4x10	13.33	133.3	75
4x4x12	16.00	160.0	63
4x4x14	18.67	186.7	54
4x4x16	21.33	213.3	47
4x4x20	26.67	266.7	38

Nominal	Actual	BF / LF	LF per 100 BF
1x4	0.75" × 3.5"	0.333	300.0
1x6	0.75" × 5.5"	0.500	200.0
1x8	0.75" × 7.25"	0.667	150.0
1x12	0.75" × 11.25"	1.000	100.0
2x4	1.5" × 3.5"	0.667	150.0
2x6	1.5" × 5.5"	1.000	100.0
2x8	1.5" × 7.25"	1.333	75.0
2x10	1.5" × 9.25"	1.667	60.0
2x12	1.5" × 11.25"	2.000	50.0
4x4	3.5" × 3.5"	1.333	75.0
4x6	3.5" × 5.5"	2.000	50.0
6x6	5.5" × 5.5"	3.000	33.3

Board feet are always figured from NOMINAL size for softwood dimensional lumber, even though a 2x is really 1-1/2" thick.

Hardwood is sold by the board foot in quarters (4/4 = 1", 8/4 = 2") of rough thickness.
Lumber yards quote framing by MBF (1,000 board feet) — divide the MBF price by 1,000 for $/BF.
Add 10–15% waste for defects and cut-offs.

10.67 board feet (4 × 4 × 8 ÷ 12).

4x4x12 = 16.00 BF; 4x4x16 = 21.33 BF.

94 pieces (1,000 ÷ 10.67).

3.5" × 3.5" after drying and planing. Board feet are still calculated on the nominal 4" × 4".