Lumber Weight

How much does a Douglas Fir 2×4 weigh?

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 ·

The answer above uses the actual dressed size — a nominal 2×4 of Douglas Fir measures 1-1/2″ × 3-1/2″ once surfaced dry (PS 20-25) — and the species' basic specific gravity of 0.45 from the USDA Wood Handbook. At 12% moisture content that works out to 33.9 lb/ft³, or 1.2 lb per linear foot.

2×4 nominal vs 1-1/2″ × 3-1/2″ actual
Dashed: nominal 2×4. Solid: actual dressed size, surfaced dry (PS 20-25).

Douglas Fir 2×4 weight by length

Weight of one Douglas Fir 2×4, by length and moisture condition
Length12% MC15% MC19% MC (KD max)GreenBoard feet
6 ft 7.4 lb 7.5 lb 7.6 lb 8.9–14.0 lb 4.00 bd ft
8 ft 9.9 lb 10.0 lb 10.2 lb 11.9–18.7 lb 5.33 bd ft
10 ft 12.4 lb 12.5 lb 12.7 lb 14.9–23.3 lb 6.67 bd ft
12 ft 14.8 lb 15.0 lb 15.3 lb 17.9–28.0 lb 8.00 bd ft
14 ft 17.3 lb 17.5 lb 17.8 lb 20.8–32.7 lb 9.33 bd ft
16 ft 19.8 lb 20.0 lb 20.4 lb 23.8–37.4 lb 10.7 bd ft
20 ft 24.7 lb 25.1 lb 25.5 lb 29.8–46.7 lb 13.3 bd ft

Green weights show the heartwood-to-sapwood moisture range (37%–115% MC for this species) — a fresh-cut board lands somewhere inside it. Board feet use nominal dimensions, as lumber is priced; weight uses actual dimensions. Expect ±10-15% piece-to-piece variation in any stack. How these are computed.

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