function calculateSquareTubeWeight() {
var width = parseFloat(document.getElementById('st_width').value);
var thickness = parseFloat(document.getElementById('st_thickness').value);
var length = parseFloat(document.getElementById('st_length').value);
var density = parseFloat(document.getElementById('st_material').value);
var quantity = parseFloat(document.getElementById('st_quantity').value);
var resultBox = document.getElementById('st-result-box');
if (isNaN(width) || isNaN(thickness) || isNaN(length) || isNaN(quantity) || width <= 0 || thickness <= 0 || length = width) {
alert("Wall thickness is too high for the given width.");
return;
}
// Calculations
// Formula: Area = (OuterWidth^2 – InnerWidth^2)
// InnerWidth = OuterWidth – 2 * Thickness
// Working in meters for volume
var widthM = width / 1000;
var thickM = thickness / 1000;
var innerWidthM = widthM – (2 * thickM);
var areaM2 = (widthM * widthM) – (innerWidthM * innerWidthM);
var weightPerMeter = areaM2 * density;
var weightPerPiece = weightPerMeter * length;
var totalWeight = weightPerPiece * quantity;
document.getElementById('st_weight_per_m').innerText = weightPerMeter.toFixed(3);
document.getElementById('st_weight_per_pc').innerText = weightPerPiece.toFixed(2);
document.getElementById('st_total_weight').innerText = totalWeight.toFixed(2);
resultBox.style.display = 'block';
}
How to Calculate Square Tube Weight
Calculating the weight of a square steel or aluminum tube is essential for logistics, structural engineering, and budgeting for construction projects. The weight depends on the dimensions of the profile (width and wall thickness) and the density of the material used.
The Mathematical Formula
To find the weight of a square tube, we first calculate the volume of the material and then multiply it by the material's density. The formula for the cross-sectional area of a square tube is:
Area = W² – (W – 2t)²
Where:
W = Outer Width
t = Wall Thickness
Once you have the area, the weight is calculated as:
Weight = Area × Length × Density
Common Material Densities
Different metals have different weights per cubic meter. Here are the standard densities used in our calculator:
Material
Density (kg/m³)
Carbon Steel
7,850
Stainless Steel
8,000
Aluminum
2,700
Copper
8,960
Example Calculation
Suppose you have a 50mm x 50mm carbon steel square tube with a 3mm wall thickness and a length of 6 meters.
Convert measurements to meters: Width = 0.05m, Thickness = 0.003m.