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 and the weight updates instantly. The number is never a guess: it comes from the USDA Forest Products Laboratory's density model and NIST's PS 20-25 dressed-size tables, both public-domain US Government data.

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.