How Many Board Feet In a 2x4x10
4.375 board feet
- Actual size: 1.5" x 3.5" (nominal 2x4")
- Length: 10 ft
Methodboard feet = (thickness x width x length in feet) / 12, using the ACTUAL dressed dimension.
Using the nominal 2x4" number instead of the actual dimension would overstate this by a meaningful margin — see /reference/nominal-vs-actual-2x4/.
A 10-foot 2x4 contains 4.375 board feet — exactly 1.25 times the 3.5 board feet in an 8-foot length of the same cross-section, because board feet scales linearly with length once thickness and width are fixed, and 10 feet is 1.25x 8 feet.
Why this one specifically
10-foot 2x4 stock is common for wall plates and studs in taller-than-standard framing, and this length is often the one that gets bought alongside 8-foot studs on the same job, making the direct ratio to the 8-foot figure the practically useful fact here rather than the number in isolation.
What moves the number
As with any 2x4, the actual dressed dimension (1.5" x 3.5") is what this figure is built from — using the nominal 2" x 4" instead would overstate the true volume by 1.524x, the same overstatement that applies at any length for this cross-section, since the error is in the width and thickness assumption, not the length.
Compare against the 8-foot length of the same 2x4, see /reference/nominal-vs-actual-2x4/ for why the actual dimension matters, and run other lengths through the board foot calculator.