How much does Douglas Fir lumber weigh?
A Douglas Fir 2×4, 8 ft weighs at 12% moisture content, kiln-dried.
33.9 lb/ft³ · 5.33 bd ft ·
Douglas Fir is a softwood with a basic specific gravity of 0.45 (ovendry mass over green volume, USDA Wood Handbook Table 5-3b) — 33.9 lb/ft³ once dried to 12% moisture content. Its Janka side hardness is 710 lbf, the 16th hardest of the 46 species on this site. Green, freshly cut moisture content runs 37% in the heartwood to 115% in the sapwood. Total shrinkage from green to ovendry runs about 12.4% by volume.
Douglas Fir weight by size
| Size | Actual (dry) | 8 ft, 12% MC | Per foot | Green range |
|---|---|---|---|---|
| 1×2 | 3/4″ × 1-1/2″ | 2.1 lb | 0.26 lb/ft | 2.6–4.1 lb |
| 1×3 | 3/4″ × 2-1/2″ | 3.5 lb | 0.44 lb/ft | 4.3–6.7 lb |
| 1×4 | 3/4″ × 3-1/2″ | 4.9 lb | 0.62 lb/ft | 6.0–9.3 lb |
| 1×6 | 3/4″ × 5-1/2″ | 7.8 lb | 0.97 lb/ft | 9.4–14.7 lb |
| 1×8 | 3/4″ × 7-1/4″ | 10.2 lb | 1.28 lb/ft | 12.5–19.7 lb |
| 1×10 | 3/4″ × 9-1/4″ | 13.1 lb | 1.63 lb/ft | 15.9–24.9 lb |
| 1×12 | 3/4″ × 11-1/4″ | 15.9 lb | 1.99 lb/ft | 19.2–30.1 lb |
| 2×2 | 1-1/2″ × 1-1/2″ | 4.2 lb | 0.53 lb/ft | 5.2–8.2 lb |
| 2×3 | 1-1/2″ × 2-1/2″ | 7.1 lb | 0.88 lb/ft | 8.6–13.4 lb |
| 2×4 | 1-1/2″ × 3-1/2″ | 9.9 lb | 1.24 lb/ft | 11.9–18.7 lb |
| 2×6 | 1-1/2″ × 5-1/2″ | 15.5 lb | 1.94 lb/ft | 18.8–29.5 lb |
| 2×8 | 1-1/2″ × 7-1/4″ | 20.5 lb | 2.56 lb/ft | 25.1–39.3 lb |
| 2×10 | 1-1/2″ × 9-1/4″ | 26.1 lb | 3.27 lb/ft | 31.7–49.8 lb |
| 2×12 | 1-1/2″ × 11-1/4″ | 31.8 lb | 3.97 lb/ft | 38.4–60.3 lb |
| 4×4 | 3-1/2″ × 3-1/2″ | 23.1 lb | 2.88 lb/ft | 27.1–42.6 lb |
| 6×6 | 5-1/2″ × 5-1/2″ | 57.0 lb | 7.12 lb/ft | 64.7–102 lb |
Board-to-board variation of ±10-15% is normal even within one species and size. How these numbers are computed.
Related
- All species: wood species index
- By density: Lighter: Hem-Fir (SG 0.42) · Denser: American Elm (SG 0.46)