How Much Does a 2x4 Weigh
7.88 lb
- Actual size: 1.5" x 3.5" (nominal 2x4")
- Length: 8 ft
- Species: Spruce-Pine-Fir (SPF) (27 lb/ft³ as milled)
Methodweight = (board feet / 12) x density — board feet computed from the ACTUAL, not nominal, dimension.
Moisture content, and any coating/finish weight, will move the real number slightly — this is the dry, as-milled figure.
7.88 lb for an 8-foot SPF 2x4 is the benchmark figure on this site — the single dimension people ask about most, usually while sizing a truck load, checking whether a stack fits a shipping quote, or just being curious after hefting one at the store and being surprised it's lighter than it looks.
Why this one specifically
A 2x4 is framing lumber's default size, and the actual dimension behind this number — 1.5" x 3.5", not the nominal 2" x 4" — is the same surfacing-loss story that turns nominal board-foot math wrong if you skip the actual dimension; see /reference/nominal-vs-actual-2x4/ for the full explanation of where that difference comes from.
What moves the number
Species-mix and moisture content are the two real variables. SPF is a grading GROUP — spruce, pine and fir species sold interchangeably — so individual studs vary somewhat in density even within one bundle, and yard stock is frequently wetter than the 12%-moisture reference this figure assumes, which adds real weight until the stud dries down in service.
For a hardwood 2x4-equivalent cross-section instead of framing SPF, compare a walnut 2x4 or a white oak 2x4 — both run noticeably heavier at the identical dimensions. Check other species or lengths directly in the wood weight calculator.