How much does a 2x4 weigh?

An 8 ft kiln-dried southern yellow pine 2x4 (actual size 1.5 x 3.5 in) weighs roughly 4.79 kg (about 10.6 lb). Species and moisture state both shift this: the same board green (freshly cut) weighs closer to 7.66 kg (about 16.9 lb).

Does green lumber weigh more than kiln-dried lumber?

Yes — green (freshly cut) lumber can weigh around 60% more than the same board kiln-dried, since it still holds much of its original moisture. Air-dried lumber sits in between, roughly 12% heavier than kiln-dried.

Is timber locally produced in Gibraltar?

No — Gibraltar has no domestic timber industry, so all dimensional lumber is imported, mainly from the UK and Spain. This adds shipping cost to the base timber price and is one reason prices run higher than in either source market.

Timber Weight Calculator | Dimensional Timber Weight by Species (kg) — Gibraltar

Lumber Weight Calculator: How Much Does Dimensional Lumber Weigh?

A board's weight matters well beyond curiosity — it sets the freight cost on a delivery, the load a truck bed or trailer can actually carry, and whether one person can lift a beam alone on site. This calculator works out that weight from a board's length, width and thickness, its wood species (each with its own density), and its moisture state, since a freshly cut board carries far more water weight than a kiln-dried one.

How to Use This Calculator

Enter the board's length, width and thickness, choosing a unit for each (mm, cm, m, ft or in).
Set the quantity of identical boards.
Choose a wood species preset — this sets the reference kiln-dried density — or enter a custom density.
Choose the moisture state: kiln-dried, air-dried, or green (freshly cut).
Choose your output mass unit (kg or lb).
Read off the weight per board, the total weight, and the estimated material cost.

The Math Behind the Calculation

A board is a rectangular prism, so its volume is length x width x thickness. Weight = volume x density x quantity, and density itself depends on species and moisture state: each species has a reference density at kiln-dried moisture content (~12%), scaled up for air-dried or green wood since unseasoned timber still holds much of its original water weight.

Worked example: a kiln-dried southern yellow pine 2x4 (actual size 3.5 x 1.5 in, 0.0889 x 0.0381 m), 8 ft (2.4384 m) long. Volume = 2.4384 x 0.0889 x 0.0381 ≈ 0.00826 m³. At a reference density of 580 kg/m³, weight = 0.00826 x 580 ≈ 4.79 kg (about 10.6 lb). The same board green (freshly cut, x1.6 moisture multiplier) would weigh roughly 7.66 kg (about 16.9 lb) — nearly 60% more.

Pro Tips

At a typical Gibraltar price of around £0.95 per kg of dimensional timber, this calculator's own worked example — a kiln-dried 2x4, 8 ft long, about 4.79 kg — costs roughly £4.55 in material, before delivery, which is higher than the UK mainland since almost all timber is imported.

Moisture state changes weight a lot: green lumber can weigh up to 60% more than the same board kiln-dried, so factor it in before booking freight or checking a lift capacity.
Nominal sizes are not actual sizes — a "2x4" measures 1.5 x 3.5 in once dressed, not a full 2 x 4 in — so measure the real dimensions if you know them.