What formula is used?

Weight = (OD² − ID²) × L × ρ, where ID = OD − 2 × t (t = wall thickness). The term (OD² − ID²) is the cross-sectional area of the hollow square section. All dimensions are converted to meters before the calculation, and density in kg/m³ gives the result in kilograms.

What wood densities are used for the preset species?

The presets use average air-dried densities: Pine 550 kg/m³, Spruce 450 kg/m³, Cedar 370 kg/m³, Fir 530 kg/m³, Oak 750 kg/m³, Maple 705 kg/m³, Walnut 640 kg/m³, Cherry 590 kg/m³, Teak 690 kg/m³, Mahogany 545 kg/m³, Bamboo 700 kg/m³. Actual density varies with moisture content and species variety.

How is inner dimension calculated?

Inner dimension (ID) = Outer dimension (OD) − 2 × Wall Thickness. For example, a 100 mm square tube with 10 mm walls has an inner dimension of 80 mm. The calculator validates that the resulting inner dimension is positive.

When should I use a custom density?

Use custom density when you know the actual measured density of your specific wood sample, or when working with an uncommon species not in the preset list. Air-dried lumber typically falls in the 300–900 kg/m³ range; green (unseasoned) wood can be significantly heavier.

Which units are supported?

Outer dimension and wall thickness accept mm, cm, or inches. Length accepts mm, cm, m, inches, or feet. All values are converted to meters before the calculation runs.

Why does moisture content matter?

Wood density increases significantly with moisture content. The preset values assume air-dried lumber (around 12–15% moisture). Freshly cut (green) wood can weigh 50–100% more than the preset values suggest.

Wood Square Tube Weight Calculator

Name: Wood Square Tube Weight Calculator
Availability: InStock
Author: Nham Vu

Enter outer side, wall thickness, length, and wood species to get the weight of a hollow square wood tube in kg and lb.

Tube Dimensions

Outer Side Dimension (OD)

Wall Thickness

Length

Wood Species

Formula Reference

W = (OD² − ID²) × L × ρ

Where OD = outer side (m), ID = OD − 2t (m), t = wall thickness (m), L = length (m), ρ = wood density (kg/m³), W = weight (kg).

Enter tube dimensions on the left and click Calculate.

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Summary

Enter outer side, wall thickness, length, and wood species to get the weight of a hollow square wood tube in kg and lb.

How it works

Enter the outer side dimension of the square tube and choose a unit (mm, cm, in).
Enter the wall thickness and choose a unit (mm, cm, in).
Enter the tube length and choose a unit (mm, cm, m, in, ft).
Select a wood species from the preset list or choose "Custom" and enter a density in kg/m³.
Click Calculate — weight is shown in kilograms and pounds along with inner dimension, cross-sectional area, and volume details.

Use cases

Estimating the weight of hollow square wood sections for furniture frames.
Calculating lumber weight for structural wood box columns in construction.
Preparing shipping and freight estimates for square hollow wood tube orders.
Comparing wood species weights when choosing material for a design project.
Bill-of-materials weight calculations for woodworking and cabinetry.
Verifying load and span requirements for wooden square tube assemblies.
Quick field estimation without manual cross-section math.
Checking whether a wood hollow section meets weight limits for a fixture.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu