Lumber Weight

How much does a SPF 2×4 weigh?

An SPF 2×4, 8 ft weighs 7.1 lb (3.2 kg) at 12% moisture content, kiln-dried.

24.4 lb/ft³ · 5.33 bd ft ·

The answer above uses the actual dressed size — a nominal 2×4 of SPF (White Spruce) measures 1-1/2″ × 3-1/2″ once surfaced dry (PS 20-25) — and the species' basic specific gravity of 0.33 from the USDA Wood Handbook. At 12% moisture content that works out to 24.4 lb/ft³, or 0.9 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).

SPF 2×4 weight by length

Weight of one SPF 2×4, by length and moisture condition
Length12% MC15% MC19% MC (KD max)GreenBoard feet
6 ft 5.3 lb 5.4 lb 5.5 lb 7.3–10.2 lb 4.00 bd ft
8 ft 7.1 lb 7.2 lb 7.4 lb 9.7–13.6 lb 5.33 bd ft
10 ft 8.9 lb 9.0 lb 9.2 lb 12.1–17.0 lb 6.67 bd ft
12 ft 10.7 lb 10.8 lb 11.1 lb 14.5–20.4 lb 8.00 bd ft
14 ft 12.4 lb 12.6 lb 12.9 lb 16.9–23.7 lb 9.33 bd ft
16 ft 14.2 lb 14.5 lb 14.8 lb 19.4–27.1 lb 10.7 bd ft
20 ft 17.8 lb 18.1 lb 18.5 lb 24.2–33.9 lb 13.3 bd ft

Green weights show the heartwood-to-sapwood moisture range (52%–113% 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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