Lumber weight calculator

A Douglas Fir 2×4, 8 ft weighs

9.9 lb (4.5 kg)

at 12% moisture content, kiln-dried.

33.9 lb/ft³ · 5.33 bd ft ·

Pick a species, size, length, and moisture condition above; the weight updates as you change them. It covers 46 species across dimensional framing lumber, boards, and timbers. Computed from the USDA Forest Products Laboratory density model and NIST PS 20-25 dressed sizes — public-domain US Government data. Methodology.

Species changes weight more than most people expect. A 2×4×8 ranges from 6.6 lb in W. Red Cedar up to 13.5 lb in White Oak — over a 2× spread — among the 29 species this site carries in that size. Moisture matters even more: that same Douglas Fir 2×4 weighs about 55% more green, straight off the saw, than it does kiln-dried at 12% moisture content.

Browse by size

• 1×2 — 2.1 lb
• 1×3 — 3.5 lb
• 1×4 — 4.9 lb
• 1×6 — 7.8 lb
• 1×8 — 10.2 lb
• 1×10 — 13.1 lb
• 1×12 — 15.9 lb
• 2×2 — 4.2 lb
• 2×3 — 7.1 lb
• 2×4 — 9.9 lb
• 2×6 — 15.5 lb
• 2×8 — 20.5 lb
• 2×10 — 26.1 lb
• 2×12 — 31.8 lb
• 4×4 — 23.1 lb
• 6×6 — 57.0 lb

Sizes shown are Douglas Fir at 8 ft, 12% MC — pick a size for the full species chart. More: the wood species index, Janka hardness scale, actual lumber sizes (nominal vs dressed), the wood density chart, and pressure-treated lumber weight.