Rectangular Tubing Weight Calculator

Enter Rectangular Tube Details

Outside Width

Outside Height

Wall Thickness

Dimension Unit

Tube Length

Length Unit

Quantity

Material

Custom Density kg/m³

Coating Allowance %

Waste Allowance %

Price Per kg

Result Mass Unit

Formula Used

The calculator first converts all dimensions to metres. It then finds the hollow rectangular cross section area by subtracting the inside rectangle from the outside rectangle.

Outer area = outside width × outside height

Inner width = outside width − 2 × wall thickness

Inner height = outside height − 2 × wall thickness

Section area = outer area − inner area

Volume = section area × length

Mass = volume × density × quantity

Final mass = base mass + coating allowance + waste allowance

Weight force = final mass × 9.80665

How to Use This Calculator

Enter the outside width, outside height, and wall thickness of the rectangular tube. Select the dimension unit that matches those three values. Next, enter the tube length and select its unit. Choose a material or select custom material and enter your own density. Add quantity, coating allowance, waste allowance, and price per kilogram if needed. Press Calculate to view results above the form. Use the CSV or PDF buttons to export the same data.

Example Data Table

Material	Outside Size	Wall	Length	Density	Approx Mass Each
Mild Steel	100 mm × 50 mm	4 mm	6 m	7850 kg/m³	Approx 52.43 kg
Aluminum	80 mm × 40 mm	3 mm	3 m	2700 kg/m³	Approx 5.54 kg
Stainless Steel	120 mm × 60 mm	5 mm	4 m	8000 kg/m³	Approx 52.00 kg

Rectangular Tubing Weight Guide

Why This Estimate Is Useful

A rectangular tube looks simple, but weight changes quickly with wall thickness, length, and material density. This calculator helps fabricators, engineers, students, and buyers estimate mass before cutting or ordering stock. It uses the outside width, outside height, wall thickness, tube length, quantity, and selected material density.

Why Tube Weight Matters

Accurate weight data supports safer design and better purchasing. A frame may be strong enough, yet too heavy for transport. A railing may meet size needs, yet exceed handling limits. A trailer part may require a precise steel mass for cost control. Small errors become large when many pieces are ordered.

This tool also includes allowances. Coating allowance can represent paint, galvanizing, plating, or wrapping. Waste allowance can represent saw kerf, offcuts, rejected pieces, or field trimming. These percentages are optional, but they improve real job estimates.

Inputs and Practical Meaning

Width and height describe the outside rectangle. Wall thickness removes material from the inside rectangle. Length sets the volume along the tube. Quantity multiplies the result. Density converts volume into mass. Custom density is useful when the material is uncommon, filled, or supplied with a certified value.

The calculator also reports cross sectional area, inside size, volume, mass per metre, mass per foot, force weight, and estimated cost. These outputs help compare tube sizes without repeating manual work.

Best Use Cases

Use this calculator for rectangular hollow sections, box tubing, furniture frames, machines, gates, supports, and general fabrication. It works for steel, stainless steel, aluminum, copper, brass, titanium, and custom materials. Use consistent units and check that wall thickness is smaller than half of the narrowest outside side.

Before final production, confirm values with supplier data. Real tubing may include corner radii, manufacturing tolerances, weld seams, surface scale, or coating differences. These effects are usually small, but they matter for certified loads, shipping weight, and billed material.

Good estimates save time. They reduce waste. They help teams order enough stock. They also make drawings, quotations, and workshop notes clearer. Use the exported files to share results with clients, estimators, or shop crews.

For repeated projects, save a sample result and reuse its settings when the same material family appears in later fabrication tasks again.

FAQs

1. What is rectangular tubing weight?

It is the mass of a hollow rectangular tube. It depends on outside size, wall thickness, length, material density, and quantity.

2. Which density should I use for steel tubing?

Mild steel is commonly estimated near 7850 kg/m³. Use supplier data when the exact grade, coating, or certification matters.

3. Does the calculator include hollow space?

Yes. It subtracts the inner rectangular area from the outer rectangular area before finding volume and mass.

4. Why is wall thickness limited?

Wall thickness must be smaller than half of the narrowest outside side. Otherwise, the inside opening becomes zero or negative.

5. Can I calculate aluminum rectangular tube weight?

Yes. Select aluminum from the material menu. You can also enter a custom density for a specific alloy.

6. What does coating allowance mean?

Coating allowance adds extra mass for paint, galvanizing, plating, wrapping, or similar surface treatments.

7. What does waste allowance mean?

Waste allowance adds extra mass for saw cuts, offcuts, trimming, rejected parts, and practical shop losses.

8. Are results exact for all tubes?

Results are strong estimates. Real tubes may include rounded corners, weld seams, tolerances, and supplier-specific variations.