Rectangular Tube Weight Calculator

Material

Width / OD (in)

Height (in)

Wall / thickness (in)

Length (ft)

Quantity

Enter dimensions, then calculate.

Planning tool only. Verify actual material, manufacturer data, code/WPS requirements and project conditions where applicable.

How it works

Rectangular tube weight is calculated from outside rectangle area minus the inside hollow area.

Weight = Cross-sectional area × Length × Density

For 2 × 3 × .125 in rectangular tube, enter 2 and 3 as outside dimensions and .125 as wall thickness.

Use actual outside dimensions and decimal wall/thickness. Nominal sizes, gauge labels and mill corner radii can cause differences.

Relevant gear

Tools that match this task — not a random product wall.

How accurate is this steel weight calculator?

It is a planning estimate based on nominal dimensions and typical density. Mill tolerances, corner radii and actual alloy can change weight.

Can I use the result for engineered lifting or load ratings?

No. Use certified supplier or mill data and qualified engineering for load-rated work.

What density is used for carbon steel?

The calculator uses about 0.2836 lb per cubic inch for carbon steel.